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cat thread pool

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cat thread pool

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The thread_pool command shows cluster wide thread pool statistics per node. By default the active, queue and rejected statistics are returned for all thread pools.

GET /_cat/thread_pool

Which looks like:

Z6MkIvC bulk                0 0 0
Z6MkIvC fetch_shard_started 0 0 0
Z6MkIvC fetch_shard_store   0 0 0
Z6MkIvC flush               0 0 0
Z6MkIvC force_merge         0 0 0
Z6MkIvC generic             0 0 0
Z6MkIvC get                 0 0 0
Z6MkIvC index               0 0 0
Z6MkIvC listener            0 0 0
Z6MkIvC management          1 0 0
Z6MkIvC refresh             0 0 0
Z6MkIvC search              0 0 0
Z6MkIvC snapshot            0 0 0
Z6MkIvC warmer              0 0 0

The first column is the node name

node_name
Z6MkIvC

The second column is the thread pool name

name
bulk
fetch_shard_started
fetch_shard_store
flush
force_merge
generic
get
index
listener
management
refresh
search
snapshot
warmer

The next three columns show the active, queue, and rejected statistics for each thread pool

active queue rejected
     0     0        0
     0     0        0
     0     0        0
     0     0        0
     0     0        0
     0     0        0
     0     0        0
     0     0        0
     0     0        0
     1     0        0
     0     0        0
     0     0        0
     0     0        0
     0     0        0

The cat thread pool API accepts a thread_pool_patterns URL parameter for specifying a comma-separated list of regular expressions to match thread pool names.

GET /_cat/thread_pool/generic?v&h=id,name,active,rejected,completed

which looks like:

id                     name    active rejected completed
0EWUhXeBQtaVGlexUeVwMg generic      0        0        70

Here the host columns and the active, rejected and completed suggest thread pool statistics are displayed.

All built-in thread pools and custom thread pools are available.

Thread Pool Fields

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For each thread pool, you can load details about it by using the field names in the table below.

Field Name	Alias	Description
`type`	`t`	The current (*) type of thread pool (`fixed` or `scaling`)
`active`	`a`	The number of active threads in the current thread pool
`size`	`s`	The number of threads in the current thread pool
`queue`	`q`	The number of tasks in the queue for the current thread pool
`queue_size`	`qs`	The maximum number of tasks permitted in the queue for the current thread pool
`rejected`	`r`	The number of tasks rejected by the thread pool executor
`largest`	`l`	The highest number of active threads in the current thread pool
`completed`	`c`	The number of tasks completed by the thread pool executor
`min`	`mi`	The configured minimum number of active threads allowed in the current thread pool
`max`	`ma`	The configured maximum number of active threads allowed in the current thread pool
`keep_alive`	`k`	The configured keep alive time for threads

Other Fields

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In addition to details about each thread pool, it is also convenient to get an understanding of where those thread pools reside. As such, you can request other details like the ip of the responding node(s).

Field Name	Alias	Description
`node_id`	`id`	The unique node ID
`ephemeral_id`	`eid`	The ephemeral node ID
`pid`	`p`	The process ID of the running node
`host`	`h`	The hostname for the current node
`ip`	`i`	The IP address for the current node
`port`	`po`	The bound transport port for the current node

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