Get hot threads

GET /_node/hot_threads

Get information about current hot threads for Logstash. A hot thread is a Java thread that has high CPU usage and takes longer than normal to execute.

Query parameters

threads integer

The number of hot threads to return. The default is 10.
stacktrace_size integer

The depth of the stack trace to report for each thread. The default is 50.
ignore_idle_threads boolean

If true, does not return idle threads. The default is true.
pretty boolean

If you append ?pretty=true to the request, the JSON returned will be pretty formatted. Use it for debugging only!
human boolean

If you append ?human=true to the request, the JSON returned will be in a human-readable format.

Responses

200 application/json

Indicates a successful call
Hide response attribute Show response attribute object
- hot_threads object
  
  Additional properties are allowed.
  
  Hide hot_threads attributes Show hot_threads attributes object
  
  busiest_threads integer
  
  threads array[object]
  
  Hide threads attributes Show threads attributes object
  
  name string
  
  path string
  
  percent_of_cpu_time number(double)
  
  state string
  
  traces array[string]
  
  time string

GET /_node/hot_threads

curl \
 -X GET http://api.example.com/_node/hot_threads

Response examples (200)

{
  "hot_threads": {
    "time": "2025-01-06T18:25:28-07:00",
    "threads": [
      {
        "name": "Ruby-0-Thread-7",
        "path": "/path/to/logstash-8.17.0/vendor/bundle/jruby/1.9/gems/puma-2.16.0-java/lib/puma/thread_pool.rb:187",
        "state": "timed_waiting",
        "traces": [
          "java.lang.Object.wait(Native Method)",
          "org.jruby.RubyThread.sleep(RubyThread.java:1002)",
          "org.jruby.RubyKernel.sleep(RubyKernel.java:803)"
        ],
        "percent_of_cpu_time": 0.0
      },
      {
        "name": "[test2]>worker3",
        "state": "waiting",
        "traces": [
          "sun.misc.Unsafe.park(Native Method)",
          "java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)",
          "java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)"
        ],
        "percent_of_cpu_time": 0.85
      },
      {
        "name": "[test2]>worker2",
        "state": "runnable",
        "traces": [
          "org.jruby.RubyClass.allocate(RubyClass.java:225)",
          "org.jruby.RubyClass.newInstance(RubyClass.java:856)",
          "org.jruby.RubyClass$INVOKER$i$newInstance.call(RubyClass$INVOKER$i$newInstance.gen)"
        ],
        "percent_of_cpu_time": 0.85
      }
    ],
    "busiest_threads": 3
  }
}