---
title: Storm UI REST API
layout: documentation
documentation: true
---


The Storm UI daemon provides a REST API that allows you to interact with a Storm cluster, which includes retrieving
metrics data and configuration information as well as management operations such as starting or stopping topologies.


# Data format

The REST API returns JSON responses and supports JSONP.
Clients can pass a callback query parameter to wrap JSON in the callback function.


# Using the UI REST API

_Note: It is recommended to ignore undocumented elements in the JSON response because future versions of Storm may not_
_support those elements anymore._


## REST API Base URL

The REST API is part of the UI daemon of Storm (started by `storm ui`) and thus runs on the same host and port as the
Storm UI (the UI daemon is often run on the same host as the Nimbus daemon).  The port is configured by `ui.port`,
which is set to `8080` by default (see [defaults.yaml](conf/defaults.yaml)).

The API base URL would thus be:

    http://<ui-host>:<ui-port>/api/v1/...

You can use a tool such as `curl` to talk to the REST API:

    # Request the cluster configuration.
    # Note: We assume ui.port is configured to the default value of 8080.
    $ curl http://<ui-host>:8080/api/v1/cluster/configuration

##Impersonating a user in secure environment
In a secure environment an authenticated user can impersonate another user. To impersonate a user the caller must pass
`doAsUser` param or header with value set to the user that the request needs to be performed as. Please see SECURITY.MD
to learn more about how to setup impersonation ACLs and authorization. The rest API uses the same configs and acls that
are used by nimbus.

Examples:

```no-highlight
 1. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1425844354\?doAsUser=testUSer1
 2. curl 'http://localhost:8080/api/v1/topology/wordcount-1-1425844354/activate' -X POST -H 'doAsUser:testUSer1'
```

## GET Operations

### /api/v1/cluster/configuration (GET)

Returns the cluster configuration.

Sample response (does not include all the data fields):

```json
  {
    "dev.zookeeper.path": "/tmp/dev-storm-zookeeper",
    "topology.tick.tuple.freq.secs": null,
    "topology.builtin.metrics.bucket.size.secs": 60,
    "topology.fall.back.on.java.serialization": false,
    "topology.max.error.report.per.interval": 5,
    "zmq.linger.millis": 5000,
    "topology.skip.missing.kryo.registrations": false,
    "storm.messaging.netty.client_worker_threads": 1,
    "ui.childopts": "-Xmx768m",
    "storm.zookeeper.session.timeout": 20000,
    "nimbus.reassign": true,
    "topology.trident.batch.emit.interval.millis": 500,
    "storm.messaging.netty.flush.check.interval.ms": 10,
    "nimbus.monitor.freq.secs": 10,
    "logviewer.childopts": "-Xmx128m",
    "java.library.path": "/usr/local/lib:/opt/local/lib:/usr/lib",
    "topology.executor.send.buffer.size": 1024,
    }
```

### /api/v1/cluster/summary (GET)

Returns cluster summary information such as nimbus uptime or number of supervisors.

Response fields:

|Field  |Value|Description
|---	|---	|---
|stormVersion|String| Storm version|
|supervisors|Integer| Number of supervisors running|
|topologies| Integer| Number of topologies running| 
|slotsTotal| Integer|Total number of available worker slots|
|slotsUsed| Integer| Number of worker slots used|
|slotsFree| Integer |Number of worker slots available|
|executorsTotal| Integer |Total number of executors|
|tasksTotal| Integer |Total tasks|
|schedulerDisplayResource| Boolean | Whether to display scheduler resource information|
|totalMem| Double | The total amount of memory in the cluster in MB|
|totalCpu| Double | The total amount of CPU in the cluster|
|availMem| Double | The amount of available memory in the cluster in MB|
|availCpu| Double | The amount of available cpu in the cluster|
|memAssignedPercentUtil| Double | The percent utilization of assigned memory resources in cluster|
|cpuAssignedPercentUtil| Double | The percent utilization of assigned CPU resources in cluster|

Sample response:

```json
   {
    "stormVersion": "0.9.2-incubating-SNAPSHOT",
    "supervisors": 1,
    "slotsTotal": 4,
    "slotsUsed": 3,
    "slotsFree": 1,
    "executorsTotal": 28,
    "tasksTotal": 28,
    "schedulerDisplayResource": true,
    "totalMem": 4096.0,
    "totalCpu": 400.0,
    "availMem": 1024.0,
    "availCPU": 250.0,
    "memAssignedPercentUtil": 75.0,
    "cpuAssignedPercentUtil": 37.5
    }
```

### /api/v1/supervisor/summary (GET)

Returns summary information for all supervisors.

Response fields:

|Field  |Value|Description|
|---	|---	|---
|id| String | Supervisor's id|
|host| String| Supervisor's host name|
|uptime| String| Shows how long the supervisor is running|
|uptimeSeconds| Integer| Shows how long the supervisor is running in seconds|
|slotsTotal| Integer| Total number of available worker slots for this supervisor|
|slotsUsed| Integer| Number of worker slots used on this supervisor|
|schedulerDisplayResource| Boolean | Whether to display scheduler resource information|
|totalMem| Double| Total memory capacity on this supervisor|
|totalCpu| Double| Total CPU capacity on this supervisor|
|usedMem| Double| Used memory capacity on this supervisor|
|usedCpu| Double| Used CPU capacity on this supervisor|

Sample response:

```json
{
    "supervisors": [
        {
            "id": "0b879808-2a26-442b-8f7d-23101e0c3696",
            "host": "10.11.1.7",
            "uptime": "5m 58s",
            "uptimeSeconds": 358,
            "slotsTotal": 4,
            "slotsUsed": 3,
            "totalMem": 3000,
            "totalCpu": 400,
            "usedMem": 1280,
            "usedCPU": 160
        }
    ],
    "schedulerDisplayResource": true
}
```

### /api/v1/nimbus/summary (GET)

Returns summary information for all nimbus hosts.

Response fields:

|Field  |Value|Description|
|---	|---	|---
|host| String | Nimbus' host name|
|port| int| Nimbus' port number|
|status| String| Possible values are Leader, Not a Leader, Dead|
|nimbusUpTime| String| Shows since how long the nimbus has been running|
|nimbusUpTimeSeconds| String| Shows since how long the nimbus has been running in seconds|
|nimbusLogLink| String| Logviewer url to view the nimbus.log|
|version| String| Version of storm this nimbus host is running|

Sample response:

```json
{
    "nimbuses":[
        {
            "host":"192.168.202.1",
            "port":6627,
            "nimbusLogLink":"http:\/\/192.168.202.1:8000\/log?file=nimbus.log",
            "status":"Leader",
            "version":"0.10.0-SNAPSHOT",
            "nimbusUpTime":"3m 33s",
            "nimbusUpTimeSeconds":"213"
        }
    ]
}
```

### /api/v1/history/summary (GET)

Returns a list of all running topologies' IDs submitted by the current user.

Response fields:

|Field  |Value | Description|
|---	|---	|---
|topo-history| List| List of Topologies' IDs|

Sample response:

```json
{
    "topo-history":[
        "wc6-1-1446571009",
        "wc8-2-1446587178"
     ]
}
```

### /api/v1/supervisor (GET)

Returns summary for a supervisor by id, or all supervisors running on a host.

Examples:

```no-highlight
 1. By host: http://ui-daemon-host-name:8080/api/v1/supervisor?host=supervisor-daemon-host-name
 2. By id: http://ui-daemon-host-name:8080/api/v1/supervisor?id=f5449110-1daa-43e2-89e3-69917b16dec9-192.168.1.1
```

Request parameters:

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String. Supervisor id | If specified, respond with the supervisor and worker stats with id. Note that when id is specified, the host argument is ignored. |
|host      |String. Host name| If specified, respond with all supervisors and worker stats in the host (normally just one)|
|sys       |String. Values 1 or 0. Default value 0| Controls including sys stats part of the response|

Response fields:

|Field  |Value|Description|
|---	|---	|---
|supervisors| Array| Array of supervisor summaries|
|workers| Array| Array of worker summaries |
|schedulerDisplayResource| Boolean | Whether to display scheduler resource information|

Each supervisor is defined by:

|Field  |Value|Description|
|---	|---	|---
|id| String | Supervisor's id|
|host| String| Supervisor's host name|
|uptime| String| Shows how long the supervisor is running|
|uptimeSeconds| Integer| Shows how long the supervisor is running in seconds|
|slotsTotal| Integer| Total number of worker slots for this supervisor|
|slotsUsed| Integer| Number of worker slots used on this supervisor|
|schedulerDisplayResource| Boolean | Whether to display scheduler resource information|
|totalMem| Double| Total memory capacity on this supervisor|
|totalCpu| Double| Total CPU capacity on this supervisor|
|usedMem| Double| Used memory capacity on this supervisor|
|usedCpu| Double| Used CPU capacity on this supervisor|

Each worker is defined by:

|Field  |Value  |Description|
|-------|-------|-----------|
|supervisorId | String| Supervisor's id|
|host | String | Worker's host name|
|port | Integer | Worker's port|
|topologyId | String | Topology Id|
|topologyName | String | Topology Name|
|executorsTotal | Integer | Number of executors used by the topology in this worker|
|assignedMemOnHeap | Double | Assigned On-Heap Memory by Scheduler (MB)|
|assignedMemOffHeap | Double | Assigned Off-Heap Memory by Scheduler (MB)|
|assignedCpu | Number | Assigned CPU by Scheduler (%)| 
|componentNumTasks | Dictionary | Components -> # of executing tasks|
|uptime| String| Shows how long the worker is running|
|uptimeSeconds| Integer| Shows how long the worker is running in seconds|
|workerLogLink | String | Link to worker log viewer page|

Sample response:

```json
{
    "supervisors": [{ 
        "totalMem": 4096.0, 
        "host":"192.168.10.237",
        "id":"bdfe8eff-f1d8-4bce-81f5-9d3ae1bf432e",
        "uptime":"7m 8s",
        "totalCpu":400.0,
        "usedCpu":495.0,
        "usedMem":3432.0,
        "slotsUsed":2,
        "version":"0.10.1",
        "slotsTotal":4,
        "uptimeSeconds":428
    }],
    "schedulerDisplayResource":true,
    "workers":[{
        "topologyName":"ras",
        "topologyId":"ras-4-1460229987",
        "host":"192.168.10.237",
        "supervisorId":"bdfe8eff-f1d8-4bce-81f5-9d3ae1bf432e",
        "assignedMemOnHeap":704.0,
        "uptime":"2m 47s",
        "uptimeSeconds":167,
        "port":6707,
        "workerLogLink":"http:\/\/host:8000\/log?file=ras-4-1460229987%2F6707%2Fworker.log",
        "componentNumTasks": {
            "word":5
        },
        "executorsTotal":8,
        "assignedCpu":130.0,
        "assignedMemOffHeap":80.0
    },
    {
        "topologyName":"ras",
        "topologyId":"ras-4-1460229987",
        "host":"192.168.10.237",
        "supervisorId":"bdfe8eff-f1d8-4bce-81f5-9d3ae1bf432e",
        "assignedMemOnHeap":904.0,
        "uptime":"2m 53s",
        "port":6706,
        "workerLogLink":"http:\/\/host:8000\/log?file=ras-4-1460229987%2F6706%2Fworker.log",
        "componentNumTasks":{
            "exclaim2":2,
            "exclaim1":3,
            "word":5
        },
        "executorsTotal":10,
        "uptimeSeconds":173,
        "assignedCpu":165.0,
        "assignedMemOffHeap":80.0
    }]
}
```

### /api/v1/owner-resources (GET)

Returns summary information aggregated at the topology owner level. Pass an optional id for a specific owner (e.g. /api/v1/owner-resources/theowner)

Response fields:

|Field  |Value|Description|
|---	|---	|---
|owner  |String |Topology owner
|totalTopologies|Integer|Total number of topologies owner is running
|totalExecutors |Integer|Total number of executors used by owner
|totalWorkers |Integer|Total number of workers used by owner
|totalTasks|Integer|Total number of tasks used by owner
|totalMemoryUsage|Double|Total Memory Assigned on behalf of owner in MB
|totalCpuUsage|Double|Total CPU Resource Assigned on behalf of User. Every 100 means 1 core
|memoryGuarantee|Double|The amount of memory resource (in MB) guaranteed to owner
|cpuGuarantee|Double|The amount of CPU resource (every 100 means 1 core) guaranteed to owner
|isolatedNodes|Integer|The amount of nodes that are guaranteed isolated to owner
|memoryGuaranteeRemaining|Double|The amount of guaranteed memory resources (in MB) remaining
|cpuGuaranteeRemaining|Double|The amount of guaranteed CPU resource (every 100 means 1 core) remaining
|totalReqOnHeapMem|Double| Total On-Heap Memory Requested by User in MB
|totalReqOffHeapMem|Double|Total Off-Heap Memory Requested by User in MB
|totalReqMem|Double|Total Memory Requested by User in MB
|totalReqCpu|Double|Total CPU Resource Requested by User. Every 100 means 1 core
|totalAssignedOnHeapMem|Double|Total On-Heap Memory Assigned on behalf of owner in MB
|totalAssignedOffHeapMem|Double|Total Off-Heap Memory Assigned on behalf of owner in MB

Sample response:
 
```json
{
    "owners": [
        {
            "totalReqOnHeapMem": 896,
            "owner": "ownerA",
            "totalExecutors": 7,
            "cpuGuaranteeRemaining": 30,
            "totalReqMem": 896,
            "cpuGuarantee": 100,
            "isolatedNodes": "N/A",
            "memoryGuarantee": 4000,
            "memoryGuaranteeRemaining": 3104,
            "totalTasks": 7,
            "totalMemoryUsage": 896,
            "totalReqOffHeapMem": 0,
            "totalReqCpu": 70,
            "totalWorkers": 2,
            "totalCpuUsage": 70,
            "totalAssignedOffHeapMem": 0,
            "totalAssignedOnHeapMem": 896,
            "totalTopologies": 1
        }
    ],
    "schedulerDisplayResource": true
}
```

### /api/v1/topology/summary (GET)

Returns summary information for all topologies.

Response fields:

|Field  |Value | Description|
|---	|---	|---
|id| String| Topology Id|
|name| String| Topology Name|
|status| String| Topology Status|
|uptime| String|  Shows how long the topology is running|
|uptimeSeconds| Integer|  Shows how long the topology is running in seconds|
|tasksTotal| Integer |Total number of tasks for this topology|
|workersTotal| Integer |Number of workers used for this topology|
|executorsTotal| Integer |Number of executors used for this topology|
|replicationCount| Integer |Number of nimbus hosts on which this topology code is replicated|
|requestedMemOnHeap| Double|Requested On-Heap Memory by User (MB)
|requestedMemOffHeap| Double|Requested Off-Heap Memory by User (MB)|
|requestedTotalMem| Double|Requested Total Memory by User (MB)|
|requestedCpu| Double|Requested CPU by User (%)|
|assignedMemOnHeap| Double|Assigned On-Heap Memory by Scheduler (MB)|
|assignedMemOffHeap| Double|Assigned Off-Heap Memory by Scheduler (MB)|
|assignedTotalMem| Double|Assigned Total Memory by Scheduler (MB)|
|assignedCpu| Double|Assigned CPU by Scheduler (%)|
|schedulerDisplayResource| Boolean | Whether to display scheduler resource information|

Sample response:

```json
{
    "topologies": [
        {
            "id": "WordCount3-1-1402960825",
            "name": "WordCount3",
            "status": "ACTIVE",
            "uptime": "6m 5s",
            "uptimeSeconds": 365,
            "tasksTotal": 28,
            "workersTotal": 3,
            "executorsTotal": 28,
            "replicationCount": 1,
            "requestedMemOnHeap": 640,
            "requestedMemOffHeap": 128,
            "requestedTotalMem": 768,
            "requestedCpu": 80,
            "assignedMemOnHeap": 640,
            "assignedMemOffHeap": 128,
            "assignedTotalMem": 768,
            "assignedCpu": 80
        }
    ],
    "schedulerDisplayResource": true
}
```

### /api/v1/topology-workers/\<id\> (GET)

Returns the worker' information (host and port) for a topology whose id is substituted for \<id\>. 
The topology id is obtained by the above /topology/summary call. 

Response fields:

|Field  |Value | Description|
|---	|---	|---
|hostPortList| List| Workers' information for a topology|
|name| Integer| Logviewer Port|

Sample response:

```json
{
    "hostPortList":[
            {
                "host":"192.168.202.2",
                "port":6701
            },
            {
                "host":"192.168.202.2",
                "port":6702
            },
            {
                "host":"192.168.202.3",
                "port":6700
            }
        ],
    "logviewerPort":8000
}
```

### /api/v1/topology/\<id\> (GET)

Returns topology information and statistics.  Substitute \<id\> with the topology id.

Request parameters:

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|window    |String. Default value :all-time| Window duration for metrics in seconds|
|sys       |String. Values 1 or 0. Default value 0| Controls including sys stats part of the response|


Response fields:

|Field  |Value |Description|
|---	|---	|---
|id| String| Topology Id|
|name| String |Topology Name|
|uptime| String |How long the topology has been running|
|uptimeSeconds| Integer |How long the topology has been running in seconds|
|status| String |Current status of the topology, e.g. "ACTIVE"|
|tasksTotal| Integer |Total number of tasks for this topology|
|workersTotal| Integer |Number of workers used for this topology|
|executorsTotal| Integer |Number of executors used for this topology|
|msgTimeout| Integer | Number of seconds a tuple has before the spout considers it failed |
|windowHint| String | window param value in "hh mm ss" format. Default value is "All Time"|
|schedulerDisplayResource| Boolean | Whether to display scheduler resource information|
|replicationCount| Integer |Number of nimbus hosts on which this topology code is replicated|
|debug| Boolean | If debug is enabled for the topology|
|samplingPct| Double| Controls downsampling of events before they are sent to event log (percentage)|
|assignedMemOnHeap| Double|Assigned On-Heap Memory by Scheduler (MB)
|assignedMemOffHeap| Double|Assigned Off-Heap Memory by Scheduler (MB)|
|assignedTotalMem| Double|Assigned Off-Heap + On-Heap Memory by Scheduler(MB)|
|assignedCpu| Double|Assigned CPU by Scheduler(%)|
|requestedMemOnHeap| Double|Requested On-Heap Memory by User (MB)
|requestedMemOffHeap| Double|Requested Off-Heap Memory by User (MB)|
|requestedCpu| Double|Requested CPU by User (%)|
|topologyStats| Array | Array of all the topology related stats per time window|
|topologyStats.windowPretty| String |Duration passed in HH:MM:SS format|
|topologyStats.window| String |User requested time window for metrics|
|topologyStats.emitted| Long |Number of messages emitted in given window|
|topologyStats.trasferred| Long |Number messages transferred in given window|
|topologyStats.completeLatency| String (double value returned in String format) |Total latency for processing the message|
|topologyStats.acked| Long |Number of messages acked in given window|
|topologyStats.failed| Long |Number of messages failed in given window|
|workers| Array | Array of workers in topology|
|workers.supervisorId | String| Supervisor's id|
|workers.host | String | Worker's host name|
|workers.port | Integer | Worker's port|
|workers.topologyId | String | Topology Id|
|workers.topologyName | String | Topology Name|
|workers.executorsTotal | Integer | Number of executors used by the topology in this worker|
|workers.assignedMemOnHeap | Double | Assigned On-Heap Memory by Scheduler (MB)|
|workers.assignedMemOffHeap | Double | Assigned Off-Heap Memory by Scheduler (MB)|
|workers.assignedCpu | Number | Assigned CPU by Scheduler (%)| 
|workers.componentNumTasks | Dictionary | Components -> # of executing tasks|
|workers.uptime| String| Shows how long the worker is running|
|workers.uptimeSeconds| Integer| Shows how long the worker is running in seconds|
|workers.workerLogLink | String | Link to worker log viewer page|
|spouts| Array | Array of all the spout components in the topology|
|spouts.spoutId| String |Spout id|
|spouts.executors| Integer |Number of executors for the spout|
|spouts.emitted| Long |Number of messages emitted in given window |
|spouts.completeLatency| String (double value returned in String format) |Total latency for processing the message|
|spouts.transferred| Long |Total number of messages  transferred in given window|
|spouts.tasks| Integer |Total number of tasks for the spout|
|spouts.lastError| String |Shows the last error happened in a spout|
|spouts.errorHost| String | Worker hostname the last error was reported on|
|spouts.errorPort| String | Worker port the last error was reported on|
|spouts.errorTime| Integer | Unix timestamp the last error was reported (seconds since epoch) |
|spouts.errorLapsedSecs| Integer | Number of seconds elapsed since that last error happened in a spout|
|spouts.errorWorkerLogLink| String | Link to the worker log that reported the exception |
|spouts.acked| Long |Number of messages acked|
|spouts.failed| Long |Number of messages failed|
|spouts.requestedMemOnHeap| Double|Requested On-Heap Memory by User (MB)
|spouts.requestedMemOffHeap| Double|Requested Off-Heap Memory by User (MB)|
|spouts.requestedCpu| Double|Requested CPU by User (%)|
|bolts| Array | Array of bolt components in the topology|
|bolts.boltId| String |Bolt id|
|bolts.capacity| String (double value returned in String format) |This value indicates number of messages executed * average execute latency / time window|
|bolts.processLatency| String (double value returned in String format)  |Average time of the bolt to ack a message after it was received|
|bolts.executeLatency| String (double value returned in String format) |Average time to run the execute method of the bolt|
|bolts.executors| Integer |Number of executor tasks in the bolt component|
|bolts.tasks| Integer |Number of instances of bolt|
|bolts.acked| Long |Number of tuples acked by the bolt|
|bolts.failed| Long |Number of tuples failed by the bolt|
|bolts.lastError| String |Shows the last error occurred in the bolt|
|bolts.errorHost| String | Worker hostname the last error was reported on|
|bolts.errorPort| String | Worker port the last error was reported on|
|bolts.errorTime| Integer | Unix timestamp the last error was reported (seconds since epoch) |
|bolts.errorLapsedSecs| Integer |Number of seconds elapsed since that last error happened in a bolt|
|bolts.errorWorkerLogLink| String | Link to the worker log that reported the exception |
|bolts.emitted| Long |Number of tuples emitted|
|bolts.requestedMemOnHeap| Double|Requested On-Heap Memory by User (MB)
|bolts.requestedMemOffHeap| Double|Requested Off-Heap Memory by User (MB)|
|bolts.requestedCpu| Double|Requested CPU by User (%)|

Examples:

```no-highlight
 1. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825
 2. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825?sys=1
 3. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825?window=600
```

Sample response:

```json
 {
    "name": "WordCount3",
    "id": "WordCount3-1-1402960825",
    "workersTotal": 3,
    "window": "600",
    "status": "ACTIVE",
    "tasksTotal": 28,
    "executorsTotal": 28,
    "uptime": "29m 19s",
    "uptimeSeconds": 1759,
    "msgTimeout": 30,
    "windowHint": "10m 0s",
    "schedulerDisplayResource": true,
    "workers": [{
        "topologyName": "WordCount3",
        "topologyId": "WordCount3-1-1402960825",
        "host": "my-host",
        "supervisorId": "9124ca9a-42e8-481e-9bf3-a041d9595430",
        "assignedMemOnHeap": 1452.0,
        "uptime": "27m 26s",
        "port": 6702,
        "workerLogLink": "logs",
        "componentNumTasks": {
            "spout": 2,
            "count": 3,
            "split": 10
        },
        "executorsTotal": 15,
        "uptimeSeconds": 1646,
        "assignedCpu": 260.0,
        "assignedMemOffHeap": 160.0
    }]
    "topologyStats": [
        {
            "windowPretty": "10m 0s",
            "window": "600",
            "emitted": 397960,
            "transferred": 213380,
            "completeLatency": "0.000",
            "acked": 213460,
            "failed": 0
        },
        {
            "windowPretty": "3h 0m 0s",
            "window": "10800",
            "emitted": 1190260,
            "transferred": 638260,
            "completeLatency": "0.000",
            "acked": 638280,
            "failed": 0
        },
        {
            "windowPretty": "1d 0h 0m 0s",
            "window": "86400",
            "emitted": 1190260,
            "transferred": 638260,
            "completeLatency": "0.000",
            "acked": 638280,
            "failed": 0
        },
        {
            "windowPretty": "All time",
            "window": ":all-time",
            "emitted": 1190260,
            "transferred": 638260,
            "completeLatency": "0.000",
            "acked": 638280,
            "failed": 0
        }
    ],
    "workers":[{
        "topologyName":"WordCount3",
        "topologyId":"WordCount3-1-1402960825",
        "host":"192.168.10.237",
        "supervisorId":"bdfe8eff-f1d8-4bce-81f5-9d3ae1bf432e-169.254.129.212",
        "uptime":"2m 47s",
        "uptimeSeconds":167,
        "port":6707,
        "workerLogLink":"http:\/\/192.168.10.237:8000\/log?file=WordCount3-1-1402960825%2F6707%2Fworker.log",
        "componentNumTasks": {
            "spout":5
        },
        "executorsTotal":8,
        "assignedMemOnHeap":704.0,
        "assignedCpu":130.0,
        "assignedMemOffHeap":80.0
    }],
    "spouts": [
        {
            "executors": 5,
            "emitted": 28880,
            "completeLatency": "0.000",
            "transferred": 28880,
            "acked": 0,
            "spoutId": "spout",
            "tasks": 5,
            "lastError": "",
            "errorHost": "",
            "errorPort": null,
            "errorWorkerLogLink": "",
            "errorTime": null,
            "errorLapsedSecs": null,
            "failed": 0
        }
    ],
        "bolts": [
        {
            "executors": 12,
            "emitted": 184580,
            "transferred": 0,
            "acked": 184640,
            "executeLatency": "0.048",
            "tasks": 12,
            "executed": 184620,
            "processLatency": "0.043",
            "boltId": "count",
            "lastError": "",
            "errorHost": "",
            "errorPort": null,
            "errorWorkerLogLink": "",
            "errorTime": null,
            "errorLapsedSecs": null,
            "capacity": "0.003",
            "failed": 0
        },
        {
            "executors": 8,
            "emitted": 184500,
            "transferred": 184500,
            "acked": 28820,
            "executeLatency": "0.024",
            "tasks": 8,
            "executed": 28780,
            "processLatency": "2.112",
            "boltId": "split",
            "lastError": "java.lang.RuntimeException: Error here! at org.apache.storm.starter.bolt.WordCountBolt.nextTuple(WordCountBolt.java:50) at org.apache.storm.executor.bolt.BoltExecutor$2.call",
            "errorHost": "192.168.10.237",
            "errorPort": 6707,
            "errorWorkerLogLink": "http://192.168.10.237:8000/api/v1/log?file=WordCount3-1-1402960825%2F6707%2Fworker.log",
            "errorTime": 1597626060,
            "errorLapsedSecs": 65,
            "capacity": "0.000",
            "failed": 0
        }
    ],
    "configuration": {
        "storm.id": "WordCount3-1-1402960825",
        "dev.zookeeper.path": "/tmp/dev-storm-zookeeper",
        "topology.tick.tuple.freq.secs": null,
        "topology.builtin.metrics.bucket.size.secs": 60,
        "topology.fall.back.on.java.serialization": false,
        "topology.max.error.report.per.interval": 5,
        "zmq.linger.millis": 5000,
        "topology.skip.missing.kryo.registrations": false,
        "storm.messaging.netty.client_worker_threads": 1,
        "ui.childopts": "-Xmx768m",
        "storm.zookeeper.session.timeout": 20000,
        "nimbus.reassign": true,
        "topology.trident.batch.emit.interval.millis": 500,
        "storm.messaging.netty.flush.check.interval.ms": 10,
        "nimbus.monitor.freq.secs": 10,
        "logviewer.childopts": "-Xmx128m",
        "java.library.path": "/usr/local/lib:/opt/local/lib:/usr/lib",
        "topology.executor.send.buffer.size": 1024,
        "storm.local.dir": "storm-local",
        "storm.messaging.netty.buffer_size": 5242880,
        "supervisor.worker.start.timeout.secs": 120,
        "topology.enable.message.timeouts": true,
        "nimbus.cleanup.inbox.freq.secs": 600,
        "nimbus.inbox.jar.expiration.secs": 3600,
        "drpc.worker.threads": 64,
        "topology.worker.shared.thread.pool.size": 4,
        "nimbus.seeds": [
            "hw10843.local"
        ],
        "storm.messaging.netty.min_wait_ms": 100,
        "storm.zookeeper.port": 2181,
        "transactional.zookeeper.port": null,
        "topology.executor.receive.buffer.size": 1024,
        "transactional.zookeeper.servers": null,
        "storm.zookeeper.root": "/storm",
        "storm.zookeeper.retry.intervalceiling.millis": 30000,
        "supervisor.enable": true,
        "storm.messaging.netty.server_worker_threads": 1
    },
    "replicationCount": 1
}
```

### /api/v1/topology/\<id\>/metrics

Returns detailed metrics for topology for a topology whose id is substituted for \<id\>. It shows metrics per component, which are aggregated by stream.

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|window    |String. Default value :all-time| window duration for metrics in seconds|
|sys       |String. Values 1 or 0. Default value 0| Controls including sys stats part of the response|

Response fields:

|Field  |Value |Description| 
|---	|---	|--- 
|window    |String. Default value ":all-time" | window duration for metrics in seconds|
 |windowHint| String | window param value in "hh mm ss" format. Default value is "All Time"| 
|spouts| Array | Array of all the spout components in the topology|
|spouts.id| String |Spout id|
|spouts.emitted| Array | Array of all the output streams this spout emits messages |
|spouts.emitted.stream_id| String | Stream id for this stream |
|spouts.emitted.value| Long | Number of messages emitted in given window|
|spouts.transferred | Array | Array of all the output streams this spout transfers messages |
|spouts.transferred.stream_id| String | Stream id for this stream |
|spouts.transferred.value| Long |Number messages transferred in given window|
|spouts.acked| Array | Array of all the output streams this spout receives ack of messages |
|spouts.acked.stream_id| String | Stream id for this stream |
|spouts.acked.value| Long |Number of messages acked in given window|
|spouts.failed| Array | Array of all the output streams this spout receives fail of messages |
|spouts.failed.stream_id| String | Stream id for this stream |
|spouts.failed.value| Long |Number of messages failed in given window|
|spouts.complete_ms_avg| Array | Array of all the output streams this spout receives ack of messages |
|spouts.complete_ms_avg.stream_id| String | Stream id for this stream |
|spouts.complete_ms_avg.value| String (double value returned in String format) | Total latency for processing the message|
|bolts| Array | Array of all the bolt components in the topology|
|bolts.id| String |Bolt id|
|bolts.emitted| Array | Array of all the output streams this bolt emits messages |
|bolts.emitted.stream_id| String | Stream id for this stream |
|bolts.emitted.value| Long | Number of messages emitted in given window|
|bolts.transferred | Array | Array of all the output streams this bolt transfers messages |
|bolts.transferred.stream_id| String | Stream id for this stream |
|bolts.transferred.value| Long |Number messages transferred in given window|
|bolts.acked| Array | Array of all the input streams this bolt acknowledges of messages |
|bolts.acked.component_id| String | Component id for this stream |
|bolts.acked.stream_id| String | Stream id for this stream |
|bolts.acked.value| Long |Number of messages acked in given window|
|bolts.failed| Array | Array of all the input streams this bolt receives fail of messages |
|bolts.failed.component_id| String | Component id for this stream |
|bolts.failed.stream_id| String | Stream id for this stream |
|bolts.failed.value| Long |Number of messages failed in given window|
|bolts.process_ms_avg| Array | Array of all the input streams this spout acks messages |
|bolts.process_ms_avg.component_id| String | Component id for this stream |
|bolts.process_ms_avg.stream_id| String | Stream id for this stream |
|bolts.process_ms_avg.value| String (double value returned in String format) |Average time of the bolt to ack a message after it was received|
|bolts.executed| Array | Array of all the input streams this bolt executes messages |
|bolts.executed.component_id| String | Component id for this stream |
|bolts.executed.stream_id| String | Stream id for this stream |
|bolts.executed.value| Long |Number of messages executed in given window|
|bolts.executed_ms_avg| Array | Array of all the output streams this spout receives ack of messages |
|bolts.executed_ms_avg.component_id| String | Component id for this stream |
|bolts.executed_ms_avg.stream_id| String | Stream id for this stream |
|bolts.executed_ms_avg.value| String (double value returned in String format) | Average time to run the execute method of the bolt|

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825/metrics
1. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825/metrics?sys=1
2. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825/metrics?window=600
```

Sample response:

```json
{
    "window":":all-time",
    "window-hint":"All time",
    "spouts":[
        {
            "id":"spout",
            "emitted":[
                {
                    "stream_id":"__metrics",
                    "value":20
                },
                {
                    "stream_id":"default",
                    "value":17350280
                },
                {
                    "stream_id":"__ack_init",
                    "value":17328160
                },
                {
                    "stream_id":"__system",
                    "value":20
                }
            ],
            "transferred":[
                {
                    "stream_id":"__metrics",
                    "value":20
                },
                {
                    "stream_id":"default",
                    "value":17350280
                },
                {
                    "stream_id":"__ack_init",
                    "value":17328160
                },
                {
                    "stream_id":"__system",
                    "value":0
                }
            ],
            "acked":[
                {
                    "stream_id":"default",
                    "value":17339180
                }
            ],
            "failed":[

            ],
            "complete_ms_avg":[
                {
                    "stream_id":"default",
                    "value":"920.497"
                }
            ]
        }
    ],
    "bolts":[
        {
            "id":"count",
            "emitted":[
                {
                    "stream_id":"__metrics",
                    "value":120
                },
                {
                    "stream_id":"default",
                    "value":190748180
                },
                {
                    "stream_id":"__ack_ack",
                    "value":190718100
                },
                {
                    "stream_id":"__system",
                    "value":20
                }
            ],
            "transferred":[
                {
                    "stream_id":"__metrics",
                    "value":120
                },
                {
                    "stream_id":"default",
                    "value":0
                },
                {
                    "stream_id":"__ack_ack",
                    "value":190718100
                },
                {
                    "stream_id":"__system",
                    "value":0
                }
            ],
            "acked":[
                {
                    "component_id":"split",
                    "stream_id":"default",
                    "value":190733160
                }
            ],
            "failed":[

            ],
            "process_ms_avg":[
                {
                    "component_id":"split",
                    "stream_id":"default",
                    "value":"0.004"
                }
            ],
            "executed":[
                {
                    "component_id":"split",
                    "stream_id":"default",
                    "value":190733140
                }
            ],
            "executed_ms_avg":[
                {
                    "component_id":"split",
                    "stream_id":"default",
                    "value":"0.005"
                }
            ]
        },
        {
            "id":"split",
            "emitted":[
                {
                    "stream_id":"__metrics",
                    "value":60
                },
                {
                    "stream_id":"default",
                    "value":190754740
                },
                {
                    "stream_id":"__ack_ack",
                    "value":17317580
                },
                {
                    "stream_id":"__system",
                    "value":20
                }
            ],
            "transferred":[
                {
                    "stream_id":"__metrics",
                    "value":60
                },
                {
                    "stream_id":"default",
                    "value":190754740
                },
                {
                    "stream_id":"__ack_ack",
                    "value":17317580
                },
                {
                    "stream_id":"__system",
                    "value":0
                }
            ],
            "acked":[
                {
                    "component_id":"spout",
                    "stream_id":"default",
                    "value":17339180
                }
            ],
            "failed":[

            ],
            "process_ms_avg":[
                {
                    "component_id":"spout",
                    "stream_id":"default",
                    "value":"0.051"
                }
            ],
            "executed":[
                {
                    "component_id":"spout",
                    "stream_id":"default",
                    "value":17339240
                }
            ],
            "executed_ms_avg":[
                {
                    "component_id":"spout",
                    "stream_id":"default",
                    "value":"0.052"
                }
            ]
        }
    ]
}
```

### /api/v1/topology/\<id\>/component/\<component\> (GET)

Returns detailed metrics and executor information for a topology whose id is substituted for \<id\> and a component whose id is substituted for \<component\>

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|component |String (required)| Component Id |
|window    |String. Default value :all-time| window duration for metrics in seconds|
|sys       |String. Values 1 or 0. Default value 0| controls including sys stats part of the response|

Response fields:

|Field  |Value |Description|
|---	|---	|---
|user   | String | Topology owner|
|id   | String | Component id|
|encodedId   | String | URL encoded component id|
|name | String | Topology name|
|executors| Integer |Number of executor tasks in the component|
|tasks| Integer |Number of instances of component|
|requestedMemOnHeap| Double|Requested On-Heap Memory by User (MB)
|requestedMemOffHeap| Double|Requested Off-Heap Memory by User (MB)|
|requestedCpu| Double|Requested CPU by User (%)|
|schedulerDisplayResource| Boolean | Whether to display scheduler resource information|
|topologyId| String | Topology id|
|topologyStatus| String | Topology status|
|encodedTopologyId| String | URL encoded topology id|
|window    |String. Default value "All Time" | window duration for metrics in seconds|
|componentType | String | component type: SPOUT or BOLT|
|windowHint| String | window param value in "hh mm ss" format. Default value is "All Time"|
|debug| Boolean | If debug is enabled for the component|
|samplingPct| Double| Controls downsampling of events before they are sent to event log (percentage)|
|eventLogLink| String| URL viewer link to event log (debug mode)|
|profilingAndDebuggingCapable| Boolean |true if there is support for Profiling and Debugging Actions|
|profileActionEnabled| Boolean |true if worker profiling (Java Flight Recorder) is enabled|
|profilerActive| Array |Array of currently active Profiler Actions|
|componentErrors| Array of Errors | List of component errors|
|componentErrors.errorTime| Long | Timestamp when the exception occurred (Prior to 0.11.0, this field was named 'time'.)|
|componentErrors.errorHost| String | host name for the error|
|componentErrors.errorPort| String | port for the error|
|componentErrors.error| String |Shows the error happened in a component|
|componentErrors.errorLapsedSecs| Integer | Number of seconds elapsed since the error happened in a component |
|componentErrors.errorWorkerLogLink| String | Link to the worker log that reported the exception |
|spoutSummary| Array | (only for spouts) Array of component stats, one element per window.| 
|spoutSummary.windowPretty| String |Duration passed in HH:MM:SS format|
|spoutSummary.window| String | window duration for metrics in seconds|
|spoutSummary.emitted| Long |Number of messages emitted in given window |
|spoutSummary.completeLatency| String (double value returned in String format) |Total latency for processing the message|
|spoutSummary.transferred| Long |Total number of messages transferred in given window|
|spoutSummary.acked| Long |Number of messages acked|
|spoutSummary.failed| Long |Number of messages failed|
|boltStats| Array | (only for bolts) Array of component stats, one element per window.| 
|boltStats.windowPretty| String |Duration passed in HH:MM:SS format|
|boltStats.window| String| window duration for metrics in seconds|
|boltStats.transferred| Long |Total number of messages  transferred in given window|
|boltStats.processLatency| String (double value returned in String format)  |Average time of the bolt to ack a message after it was received|
|boltStats.acked| Long |Number of messages acked|
|boltStats.failed| Long |Number of messages failed|
|inputStats| Array | (only for bolts) Array of input stats|
|inputStats.component| String |Component id|
|inputStats.encodedComponentId| String |URL encoded component id|
|inputStats.executeLatency| Long | The average time a tuple spends in the execute method|
|inputStats.processLatency| Long | The average time it takes to ack a tuple after it is first received|
|inputStats.executed| Long |The number of incoming tuples processed|
|inputStats.acked| Long |Number of messages acked|
|inputStats.failed| Long |Number of messages failed|
|inputStats.stream| String |The name of the tuple stream given in the topology, or "default" if none specified|
|outputStats| Array | Array of output stats|
|outputStats.transferred| Long |Number of tuples emitted that sent to one ore more bolts|
|outputStats.emitted| Long |Number of tuples emitted|
|outputStats.stream| String |The name of the tuple stream given in the topology, or "default" if none specified|

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825/component/spout
2. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825/component/spout?sys=1
3. http://ui-daemon-host-name:8080/api/v1/topology/WordCount3-1-1402960825/component/spout?window=600
```

Sample response:

```json
{
    "name": "WordCount3",
    "id": "spout",
    "componentType": "spout",
    "windowHint": "10m 0s",
    "executors": 5,
    "componentErrors":[{"errorTime": 1406006074000,
                        "errorHost": "10.11.1.70",
                        "errorPort": 6701,
                        "errorWorkerLogLink": "http://10.11.1.7:8000/log?file=worker-6701.log",
                        "errorLapsedSecs": 16,
                        "error": "java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException: Some Error\n\tat org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:128)\n\tat org.apache.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:99)\n\t...more.."
    }],
    "topologyId": "WordCount3-1-1402960825",
    "tasks": 5,
    "window": "600",
    "profilerActive": [
        {
            "host": "10.11.1.70",
            "port": "6701",
            "dumplink":"http:\/\/10.11.1.70:8000\/dumps\/ex-1-1452718803\/10.11.1.70%3A6701",
            "timestamp":"576328"
        }
    ],
    "profilingAndDebuggingCapable": true,
    "profileActionEnabled": true,
    "spoutSummary": [
        {
            "windowPretty": "10m 0s",
            "window": "600",
            "emitted": 28500,
            "transferred": 28460,
            "completeLatency": "0.000",
            "acked": 0,
            "failed": 0
        },
        {
            "windowPretty": "3h 0m 0s",
            "window": "10800",
            "emitted": 127640,
            "transferred": 127440,
            "completeLatency": "0.000",
            "acked": 0,
            "failed": 0
        },
        {
            "windowPretty": "1d 0h 0m 0s",
            "window": "86400",
            "emitted": 127640,
            "transferred": 127440,
            "completeLatency": "0.000",
            "acked": 0,
            "failed": 0
        },
        {
            "windowPretty": "All time",
            "window": ":all-time",
            "emitted": 127640,
            "transferred": 127440,
            "completeLatency": "0.000",
            "acked": 0,
            "failed": 0
        }
    ],
    "outputStats": [
        {
            "stream": "__metrics",
            "emitted": 40,
            "transferred": 0,
            "completeLatency": "0",
            "acked": 0,
            "failed": 0
        },
        {
            "stream": "default",
            "emitted": 28460,
            "transferred": 28460,
            "completeLatency": "0",
            "acked": 0,
            "failed": 0
        }
    ],
    "executorStats": [
        {
            "workerLogLink": "http://10.11.1.7:8000/log?file=worker-6701.log",
            "emitted": 5720,
            "port": 6701,
            "completeLatency": "0.000",
            "transferred": 5720,
            "host": "10.11.1.7",
            "acked": 0,
            "uptime": "43m 4s",
            "uptimeSeconds": 2584,
            "id": "[24-24]",
            "failed": 0
        },
        {
            "workerLogLink": "http://10.11.1.7:8000/log?file=worker-6703.log",
            "emitted": 5700,
            "port": 6703,
            "completeLatency": "0.000",
            "transferred": 5700,
            "host": "10.11.1.7",
            "acked": 0,
            "uptime": "42m 57s",
            "uptimeSeconds": 2577,
            "id": "[25-25]",
            "failed": 0
        },
        {
            "workerLogLink": "http://10.11.1.7:8000/log?file=worker-6702.log",
            "emitted": 5700,
            "port": 6702,
            "completeLatency": "0.000",
            "transferred": 5680,
            "host": "10.11.1.7",
            "acked": 0,
            "uptime": "42m 57s",
            "uptimeSeconds": 2577,
            "id": "[26-26]",
            "failed": 0
        },
        {
            "workerLogLink": "http://10.11.1.7:8000/log?file=worker-6701.log",
            "emitted": 5700,
            "port": 6701,
            "completeLatency": "0.000",
            "transferred": 5680,
            "host": "10.11.1.7",
            "acked": 0,
            "uptime": "43m 4s",
            "uptimeSeconds": 2584,
            "id": "[27-27]",
            "failed": 0
        },
        {
            "workerLogLink": "http://10.11.1.7:8000/log?file=worker-6703.log",
            "emitted": 5680,
            "port": 6703,
            "completeLatency": "0.000",
            "transferred": 5680,
            "host": "10.11.1.7",
            "acked": 0,
            "uptime": "42m 57s",
            "uptimeSeconds": 2577,
            "id": "[28-28]",
            "failed": 0
        }
    ]
}
```

## Profiling and Debugging POST Operations

###  /api/v1/topology/\<id\>/profiling/start/\<host-port\>/\<timeout\> (POST)

Request to start profiler on worker with timeout. Returns status and link to profiler artifacts for worker.
Substitute appropriate values for \<id\>, \<host-port\> and \<timeout\>.

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|host-port |String (required)| Worker Id |
|timeout |String (required)| Time out for profiler to stop in minutes |

Response fields:

|Field  |Value |Description|
|-----	|----- |-----------|
|id   | String | Worker id|
|status | String | Response Status |
|timeout | String | Requested timeout
|dumplink | String | Link to logviewer URL for worker profiler documents.|

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/start/10.11.1.7:6701/10
2. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/start/10.11.1.7:6701/5
3. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/start/10.11.1.7:6701/20
```

Sample response:

```json
{
   "status": "ok",
   "id": "10.11.1.7:6701",
   "timeout": "10",
   "dumplink": "http:\/\/10.11.1.7:8000\/dumps\/wordcount-1-1446614150\/10.11.1.7%3A6701"
}
```

###  /api/v1/topology/\<id\>/profiling/dumpprofile/\<host-port\> (POST)

Request to dump profiler recording on worker. Returns status and worker id for the request.
Substitute for \<id\> and \<host-port\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|host-port |String (required)| Worker Id |

Response fields:

|Field  |Value |Description|
|-----	|----- |-----------|
|id   | String | Worker id|
|status | String | Response Status |

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/dumpprofile/10.11.1.7:6701
```

Sample response:

```json
{
   "status": "ok",
   "id": "10.11.1.7:6701",
}
```

###  /api/v1/topology/\<id\>/profiling/stop/\<host-port\> (POST)

Request to stop profiler on worker. Returns status and worker id for the request.
Substitute for \<id\> and \<host-port\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|host-port |String (required)| Worker Id |

Response fields:

|Field  |Value |Description|
|-----	|----- |-----------|
|id   | String | Worker id|
|status | String | Response Status |

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/stop/10.11.1.7:6701
```

Sample response:

```json
{
   "status": "ok",
   "id": "10.11.1.7:6701",
}
```

###  /api/v1/topology/\<id\>/profiling/dumpjstack/\<host-port\> (POST)

Request to dump jstack on worker. Returns status and worker id for the request.
Substitute for \<id\> and \<host-port\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|host-port |String (required)| Worker Id |

Response fields:

|Field  |Value |Description|
|-----	|----- |-----------|
|id   | String | Worker id|
|status | String | Response Status |

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/dumpjstack/10.11.1.7:6701
```

Sample response:

```json
{
   "status": "ok",
   "id": "10.11.1.7:6701",
}
```

###  /api/v1/topology/\<id\>/profiling/dumpheap/\<host-port\> (POST)

Request to dump heap (jmap) on worker. Returns status and worker id for the request.
Substitute for \<id\> and \<host-port\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|host-port |String (required)| Worker Id |

Response fields:

|Field  |Value |Description|
|-----	|----- |-----------|
|id   | String | Worker id|
|status | String | Response Status |

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/dumpheap/10.11.1.7:6701
```

Sample response:

```json
{
   "status": "ok",
   "id": "10.11.1.7:6701",
}
```

###  /api/v1/topology/\<id\>/profiling/restartworker/\<host-port\> (POST)

Request to request the worker. Returns status and worker id for the request.
Substitute for \<id\> and \<host-port\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|host-port |String (required)| Worker Id |

Response fields:

|Field  |Value |Description|
|-----	|----- |-----------|
|id   | String | Worker id|
|status | String | Response Status |

Examples:

```no-highlight
1. http://ui-daemon-host-name:8080/api/v1/topology/wordcount-1-1446614150/profiling/restartworker/10.11.1.7:6701
```

Sample response:

```json
{
   "status": "ok",
   "id": "10.11.1.7:6701",
}
```

## POST Operations

### /api/v1/topology/\<id\>/activate (POST)

Activates a topology. Substitute for \<id\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |

Sample Response:

```json
{"topologyOperation":"activate","topologyId":"wordcount-1-1420308665","status":"success"}
```


### /api/v1/topology/\<id\>/deactivate (POST)

Deactivates a topology. Substitute for \<id\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |

Sample Response:

```json
{"topologyOperation":"deactivate","topologyId":"wordcount-1-1420308665","status":"success"}
```


### /api/v1/topology/\<id\>/rebalance/\<wait-time\> (POST)

Rebalances a topology.
Substitute for \<id\> and \<wait-time\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|wait-time |String (required)| Wait time before rebalance happens |
|rebalanceOptions| Json (optional) | topology rebalance options |


Sample rebalanceOptions json:

```json
{"rebalanceOptions" : {"numWorkers" : 2, "executors" : {"spout" :4, "count" : 10}}, "callback" : "foo"}
```

Examples:

```no-highlight
curl  -i -b ~/cookiejar.txt -c ~/cookiejar.txt -X POST  
-H "Content-Type: application/json" 
-d  '{"rebalanceOptions": {"numWorkers": 2, "executors": { "spout" : "5", "split": 7, "count": 5 }}, "callback":"foo"}' 
http://localhost:8080/api/v1/topology/wordcount-1-1420308665/rebalance/0
```

Sample Response:

```json
{"topologyOperation":"rebalance","topologyId":"wordcount-1-1420308665","status":"success"}
```



### /api/v1/topology/\<id\>/kill/\<wait-time\> (POST)

Kills a topology.
Substitute for \<id\> and \<wait-time\>. 

|Parameter |Value   |Description  |
|----------|--------|-------------|
|id   	   |String (required)| Topology Id  |
|wait-time |String (required)| Wait time before rebalance happens |

Caution: Small wait times (0-5 seconds) may increase the probability of triggering the bug reported in
[STORM-112](https://issues.apache.org/jira/browse/STORM-112), which may result in broker Supervisor
daemons.

Sample Response:

```json
{"topologyOperation":"kill","topologyId":"wordcount-1-1420308665","status":"success"}
```

## API errors

The API returns 500 HTTP status codes in case of any errors.

# DRPC REST API

If DRPC is configured with either an http or https port it will expose a REST endpoint. (See [Setting up a Storm cluster](Setting-up-a-Storm-cluster.html) for how to do that)

In all of these commands `:func` is the DRPC function and `:args` is the arguments to it.  The only difference is in how those arguments are supplied.  In all cases the response
is in the response's body.

In all cases DRPC does not have state, so if your request times out or results in an error please retry the request, but preferably with an exponential backoff to avoid doing a
DDOS on the DRPC servers.

### /drpc/:func (POST)

In this case the `:args` to the drpc request are in the body of the post.

### /drpc/:func/:args (GET)

In this case the `:args` are supplied as a part of the URL itself.  There are limitations on URL lengths by many tools, so if this is above a hundred characters it is recomended 
to use the POST option instead.

### /drpc/:func (GET)

In some rare cases `:args` may not be needed by the DRPC command.  If no `:args` section is given in the DRPC request and empty string `""` will be used for the arguments.


