Elasticsearch 7：使用 _cat thread_pool 查询线程池运行情况


#Elasticsearch 笔记

简介

GET _cat/thread_pool 指令可以展示 ES 自运行以来的线程池统计信息。有些信息是实时的（如active），有些信息是累计的（例如 rejected）。

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示例

示例1：默认输出

运行：

GET _cat/thread_pool

输出：

Myhost analyze             0 0 0
Myhost ccr                 0 0 0
Myhost data_frame_indexing 0 0 0
Myhost fetch_shard_started 0 0 0
Myhost fetch_shard_store   0 0 0
Myhost flush               0 0 0
Myhost force_merge         0 0 0
Myhost generic             0 0 0
Myhost get                 0 0 0
Myhost listener            0 0 0
Myhost management          1 0 0
Myhost ml_datafeed         0 0 0
Myhost ml_job_comms        0 0 0
Myhost ml_utility          0 0 0
Myhost refresh             0 0 0
Myhost rollup_indexing     0 0 0
Myhost search              0 0 0
Myhost search_throttled    0 0 0
Myhost security-token-key  0 0 0
Myhost snapshot            0 0 0
Myhost warmer              0 0 0
Myhost watcher             0 0 0
Myhost write               0 0 0

每一列依次是 node_name、name、active、queue、rejected 。

示例2：显示表头

执行：

GET _cat/thread_pool?v

输出：

node_name name                active queue rejected
Myhost    analyze                  0     0        0
Myhost    ccr                      0     0        0
Myhost    data_frame_indexing      0     0        0
Myhost    fetch_shard_started      0     0        0
Myhost    fetch_shard_store        0     0        0
Myhost    flush                    0     0        0
Myhost    force_merge              0     0        0
Myhost    generic                  0     0        0
Myhost    get                      0     0        0
Myhost    listener                 0     0        0
Myhost    management               1     0        0
Myhost    ml_datafeed              0     0        0
Myhost    ml_job_comms             0     0        0
Myhost    ml_utility               0     0        0
Myhost    refresh                  0     0        0
Myhost    rollup_indexing          0     0        0
Myhost    search                   0     0        0
Myhost    search_throttled         0     0        0
Myhost    security-token-key       0     0        0
Myhost    snapshot                 0     0        0
Myhost    warmer                   0     0        0
Myhost    watcher                  0     0        0
Myhost    write                    0     0        0

示例3：通过 h 指定展示的列

运行：

GET _cat/thread_pool?v&h=name,core,host,port

输出：

name                core host      port
analyze                  127.0.0.1 9300
ccr                      127.0.0.1 9300
data_frame_indexing      127.0.0.1 9300
fetch_shard_started    1 127.0.0.1 9300
fetch_shard_store      1 127.0.0.1 9300
flush                  1 127.0.0.1 9300
force_merge              127.0.0.1 9300
generic                4 127.0.0.1 9300
get                      127.0.0.1 9300
listener                 127.0.0.1 9300
management             1 127.0.0.1 9300
ml_datafeed            1 127.0.0.1 9300
ml_job_comms           4 127.0.0.1 9300
ml_utility             1 127.0.0.1 9300
refresh                1 127.0.0.1 9300
rollup_indexing          127.0.0.1 9300
search                   127.0.0.1 9300
search_throttled         127.0.0.1 9300
security-token-key       127.0.0.1 9300
snapshot               1 127.0.0.1 9300
warmer                 1 127.0.0.1 9300
watcher                  127.0.0.1 9300
write                    127.0.0.1 9300

示例4：展示特定线程池的统计信息

例如 analyze 线程池。

运行：

GET _cat/thread_pool/analyze?v&h=name,core,host,port

输出：

name    core host      port
analyze      127.0.0.1 9300


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