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:
node-0 analyze 0 0 0 ... node-0 fetch_shard_started 0 0 0 node-0 fetch_shard_store 0 0 0 node-0 flush 0 0 0 ... node-0 write 0 0 0
The first column is the node name
node_name node-0
The second column is the thread pool name
name analyze ccr (default distro only) fetch_shard_started fetch_shard_store flush force_merge generic get listener management ml_autodetect (default distro only) ml_datafeed (default distro only) ml_utility (default distro only) refresh rollup_indexing (default distro only)` search security-token-key (default distro only) snapshot warmer watcher (default distro only) write
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
0 0 0
1 0 0
0 0 0
0 0 0
0 0 0
0 0 0The 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.
For each thread pool, you can load details about it by using the field names in the table below.
| Field Name | Alias | Description |
|---|---|---|
|
| The current (*) type of thread pool ( |
|
| The number of active threads in the current thread pool |
|
| The number of threads in the current thread pool |
|
| The number of tasks in the queue for the current thread pool |
|
| The maximum number of tasks permitted in the queue for the current thread pool |
|
| The number of tasks rejected by the thread pool executor |
|
| The highest number of active threads in the current thread pool |
|
| The number of tasks completed by the thread pool executor |
|
| The configured core number of active threads allowed in the current thread pool |
|
| The configured maximum number of active threads allowed in the current thread pool |
|
| The configured fixed number of active threads allowed in the current thread pool |
|
| The configured keep alive time for threads |
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 |
|---|---|---|
|
| The unique node ID |
|
| The ephemeral node ID |
|
| The process ID of the running node |
|
| The hostname for the current node |
|
| The IP address for the current node |
|
| The bound transport port for the current node |