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Lukáš Vlček 98c7dd29a6 Fixing Nodes APIs issues

1. Fixing all reported dead links.
2. Changing `title` value in index.md back to plural form, i.e. "Nodes APIs".

The second change fixed missing child pages. I am not saying I insist on use of plural form but if we want to change it to a singular form then we also have to change `parent` fields in all child pages to correctly refer to valid parent, otherwise all child pages and content is missing.

As for the debate of use APIs vs API (plural vs singular) I just want to point out that right now there are many other parent pages using plural form. If we want to change that then I suggest doing it in separate PR and include other relevant parent pages too.

Closes: #591
Signed-off-by: Lukáš Vlček <lukas.vlcek@aiven.io>

2022-05-20 11:36:23 +02:00

5.2 KiB

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layout	title	parent	grand_parent	nav_order
default	Nodes hot threads	Nodes APIs	REST API reference	10

Nodes hot threads

The nodes hot threads endpoint provides information about busy JVM threads for selected cluster nodes. It provides a unique view of the of activity each node.

Example

GET /_nodes/hot_threads

Path and HTTP methods

GET /_nodes/hot_threads
GET /_nodes/{nodeId}/hot_threads

URL parameters

You can include the following URL parameters in your request. All parameters are optional.

Parameter	Type	Description
nodeId	String	A comma-separated list of node IDs to filter results. Supports node filters. Defaults to `_all`.
snapshots	Integer	Number of samples of thread stacktraces. Defaults to `10`.
interval	TimeValue	Interval between consecutive samples. Defaults to `500ms`.
threads	Integer	A number of top busiest threads to return information about. Defaults to `3`.
ignore_idle_threads	Boolean	Don’t show threads that are in known-idle states, such as waiting on a socket select or pulling from an empty task queue. Defaults to `true`.
type	String	Supported thread types are `cpu`, `wait`, or `block`. Defaults to `cpu`.
timeout	TimeValue	A request timeout. Defaults to `30s`.

Response

Unlike the majority of OpenSearch API responses, this response is in a text format.

It consists of one section per each cluster node included in the response.

Each section starts with a single line containing the following segments:

Line segment	Description
`:::`	Line start (a distinct visual symbol).
`{global-eu-35}`	Node name.
`{uFPbKLDOTlOmdnwUlKW8sw}`	NodeId.
`{OAM8OT5CQAyasWuIDeVyUA}`	EphemeralId.
`{global-eu-35.local}`	Host name.
`{[gdv2:a284:2acv:5fa6:0:3a2:7260:74cf]:9300}`	Host address.
`{dimr}`	Node roles (d=data, i=ingest, m=cluster manager, r=remote cluster client).
`{zone=west-a2, shard_indexing_pressure_enabled=true}`	Node attributes.

Then follows information about threads of selected type.

::: {global-eu-35}{uFPbKLDOTlOmdnwUlKW8sw}{OAM8OT5CQAyasWuIDeVyUA}{global-eu-35.local}{[gdv2:a284:2acv:5fa6:0:3a2:7260:74cf]:9300}{dimr}{zone=west-a2, shard_indexing_pressure_enabled=true}
   Hot threads at 2022-04-01T15:15:27.658Z, interval=500ms, busiestThreads=3, ignoreIdleThreads=true:
   
    0.1% (645micros out of 500ms) cpu usage by thread 'opensearch[global-eu-35][transport_worker][T#7]'
     4/10 snapshots sharing following 3 elements
       io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
       io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
       java.base@11.0.14.1/java.lang.Thread.run(Thread.java:829)
::: {global-eu-62}{4knOxAdERlOB19zLQIT1bQ}{HJuZs2HiQ_-8Elj0Fvi_1g}{global-eu-62.local}{[gdv2:a284:2acv:5fa6:0:3a2:bba6:fe3f]:9300}{dimr}{zone=west-a2, shard_indexing_pressure_enabled=true}
   Hot threads at 2022-04-01T15:15:27.659Z, interval=500ms, busiestThreads=3, ignoreIdleThreads=true:
      
   18.7% (93.4ms out of 500ms) cpu usage by thread 'opensearch[global-eu-62][transport_worker][T#3]'
     6/10 snapshots sharing following 3 elements
       io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
       io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
       java.base@11.0.14.1/java.lang.Thread.run(Thread.java:829)
::: {global-eu-44}{8WW3hrkcTwGvgah_L8D_jw}{Sok7spHISFyol0jFV6i0kw}{global-eu-44.local}{[gdv2:a284:2acv:5fa6:0:3a2:9120:e79e]:9300}{dimr}{zone=west-a2, shard_indexing_pressure_enabled=true}
   Hot threads at 2022-04-01T15:15:27.659Z, interval=500ms, busiestThreads=3, ignoreIdleThreads=true:
   
   42.6% (212.7ms out of 500ms) cpu usage by thread 'opensearch[global-eu-44][write][T#5]'
     2/10 snapshots sharing following 43 elements
       java.base@11.0.14.1/sun.nio.ch.IOUtil.write1(Native Method)
       java.base@11.0.14.1/sun.nio.ch.EPollSelectorImpl.wakeup(EPollSelectorImpl.java:254)
       io.netty.channel.nio.NioEventLoop.wakeup(NioEventLoop.java:787)
       io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:846)
       io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:815)
       io.netty.channel.AbstractChannelHandlerContext.safeExecute(AbstractChannelHandlerContext.java:989)
       io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:796)
       io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:758)
       io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1020)
       io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:311)
       org.opensearch.transport.netty4.Netty4TcpChannel.sendMessage(Netty4TcpChannel.java:159)
       app//org.opensearch.transport.OutboundHan...

Required permissions

If you use the security plugin, make sure you set the following permissions: cluster:monitor/nodes/hot_threads.

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