/api/stats/threads

The threads endpoint is used for debugging the TSD and providing insight into the state and execution of various threads without having to resort to a JStack trace. (v2.2)

Verbs

  • GET

Requests

No parameters available.

Example Request

Query String

  1. http://localhost:4242/api/stats/threads

Response

The response is an array of objects. Fields in the response include:

Name

Data Type

Description

Example

threadID

Integer

Numeric ID of the thread

1

priority

Integer

Execution priority for the thread

5

name

String

String name of the thread, usually assigned by default

New I/O worker #23

interrupted

Boolean

Whether or not the thread was interrupted

false

state

String

One of the valid Java thread states

RUNNABLE

stack

Array<String>

A stack trace showing where execution is currently located

See Below

Example Response

  1. [
  2.     {
  3.         "threadID": 33,
  4.         "priority": 5,
  5.         "name": "AsyncHBase I/O Worker #23",
  6.         "interrupted": false,
  7.         "state": "RUNNABLE",
  8.         "stack": [
  9.             "sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)",
  10.             "sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)",
  11.             "sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)",
  12.             "sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)",
  13.             "sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)",
  14.             "org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:68)",
  15.             "org.jboss.netty.channel.socket.nio.AbstractNioSelector.select(AbstractNioSelector.java:415)",
  16.             "org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:212)",
  17.             "org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)",
  18.             "org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)",
  19.             "org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)",
  20.             "org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)",
  21.             "java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)",
  22.             "java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)",
  23.             "java.lang.Thread.run(Thread.java:695)"
  24.         ]
  25.     },
  26.     {
  27.         "threadID": 6,
  28.         "priority": 9,
  29.         "name": "Signal Dispatcher",
  30.         "interrupted": false,
  31.         "state": "RUNNABLE",
  32.         "stack": []
  33.     },
  34.     {
  35.         "threadID": 21,
  36.         "priority": 5,
  37.         "name": "AsyncHBase I/O Worker #11",
  38.         "interrupted": false,
  39.         "state": "RUNNABLE",
  40.         "stack": [
  41.             "sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)",
  42.             "sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)",
  43.             "sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)",
  44.             "sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)",
  45.             "sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)",
  46.             "org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:68)",
  47.             "org.jboss.netty.channel.socket.nio.AbstractNioSelector.select(AbstractNioSelector.java:415)",
  48.             "org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:212)",
  49.             "org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)",
  50.             "org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)",
  51.             "org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)",
  52.             "org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)",
  53.             "java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)",
  54.             "java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)",
  55.             "java.lang.Thread.run(Thread.java:695)"
  56.         ]
  57.     },
  58.     {
  59.         "threadID": 2,
  60.         "priority": 10,
  61.         "name": "Reference Handler",
  62.         "interrupted": false,
  63.         "state": "WAITING",
  64.         "stack": [
  65.             "java.lang.Object.wait(Native Method)",
  66.             "java.lang.Object.wait(Object.java:485)",
  67.             "java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)"
  68.         ]
  69.     },
  70.     {
  71.         "threadID": 44,
  72.         "priority": 5,
  73.         "name": "OpenTSDB Timer TSDB Timer #1",
  74.         "interrupted": false,
  75.         "state": "TIMED_WAITING",
  76.         "stack": [
  77.             "java.lang.Thread.sleep(Native Method)",
  78.             "org.jboss.netty.util.HashedWheelTimer$Worker.waitForNextTick(HashedWheelTimer.java:483)",
  79.             "org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:392)",
  80.             "org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)",
  81.             "java.lang.Thread.run(Thread.java:695)"
  82.         ]
  83.     }
  84. ]