# cat thread pool 原文链接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.0/cat-thread-pool.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/cat-thread-pool.html) 译文链接 : [http://www.apache.wiki/display/Elasticsearch/cat+thread+pool](http://www.apache.wiki/display/Elasticsearch/cat+thread+pool) 贡献者 : [那伊抹微笑](/display/~wangyangting) **thread_pool** 命令展示了集群中每一个节点的线程池的统计信息。默认情况下返回所有线程池的 **actinve**（活跃的），**queue**（队列中的）和 **reject**（拒绝的）的统计信息。 ``` % curl 192.168.56.10:9200/_cat/thread_pool 0EWUhXe bulk 0 0 0 0EWUhXe fetch_shard_started 0 0 0 0EWUhXe fetch_shard_store 0 0 0 0EWUhXe flush 0 0 0 0EWUhXe force_merge 0 0 0 0EWUhXe generic 0 0 0 0EWUhXe get 0 0 0 0EWUhXe index 0 0 0 0EWUhXe listener 0 0 0 0EWUhXe management 1 0 0 0EWUhXe refresh 0 0 0 0EWUhXe search 0 0 0 0EWUhXe snapshot 0 0 0 0EWUhXe warmer 0 0 0 ``` 第一列是节点名 ``` node_name 0EWUhXe ``` 第二列是线程池名 ``` name bulk fetch_shard_started fetch_shard_store flush force_merge generic get index listener management refresh search snapshot warmer ``` 接下来的三列是所有线程池的 **actinve**（活跃的），**queue**（队列中的）和 **reject**（拒绝的）的统计信息。 ``` 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 ``` 该 **cat thread pool API** 接受一个 **`thread_pool_patterns`**URL 参数，该参数指定一个逗号分隔的正则表达式列表以匹配线程池名称。 ``` % curl 'localhost:9200/_cat/thread_pool/generic?v&h=id,name,active,rejected,completed' id name active rejected completed 0EWUhXeBQtaVGlexUeVwMg generic 0 0 70 ``` 在这里，建议线程池的统计信息展示 **host**，**active**，**rejected** 和 **completed** 列。 所有 [built-in thread pools](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/modules-threadpool.html "Thread Pool") 和自定义的线程池都是可用的。 ## 线程池字段 对于每个线程池来说，您可以通过使用表哥中的字段名来获得详细说明。 | Field Name（字段名） | Alias（别名） | Description（描述） | | --- | --- | --- | | `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 | ## 其它字段 除了每个线程池的详细说明之外，它也可以方便理解线程池的内部。同样的，您可以请求响应的节点的其它详细说明。（例如 **ip**） | Field Name（字段名） | Alias（别名） | Description（描述） | | --- | --- | --- | | `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 |