cat thread pool · Elasticsearch 5.4 中文文檔

# cat thread pool 原文鏈接 : [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) 譯文鏈接 : [http://www.apache.wiki/display/Elasticsearch/cat+thread+pool](http://www.apache.wiki/display/Elasticsearch/cat+thread+pool) 貢獻者 : [那伊抹微笑](/display/~wangyangting) **thread_pool** 命令展示了集群中每一個節點的線程池的統計信息。默認情況下返回所有線程池的 **actinve**（活躍的），**queue**（隊列中的）和 **reject**（拒絕的）的統計信息。 ``` % 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 ``` 第一列是節點名 ``` node_name 0EWUhXe ``` 第二列是線程池名 ``` name bulk fetch_shard_started fetch_shard_store flush force_merge generic get index listener management refresh search snapshot warmer ``` 接下來的三列是所有線程池的 **actinve**（活躍的），**queue**（隊列中的）和 **reject**（拒絕的）的統計信息。 ``` 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 ``` 該 **cat thread pool API** 接受一個?**`thread_pool_patterns`**URL 參數，該參數指定一個逗號分隔的正則表達式列表以匹配線程池名稱。 ``` % curl 'localhost:9200/_cat/thread_pool/generic?v&h=id,name,active,rejected,completed' id name active rejected completed 0EWUhXeBQtaVGlexUeVwMg generic 0 0 70 ``` 在這里，建議線程池的統計信息展示 **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")?和自定義的線程池都是可用的。 ## 線程池字段對于每個線程池來說，您可以通過使用表哥中的字段名來獲得詳細說明。 | Field Name（字段名） | Alias（別名） | 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 | ## 其它字段除了每個線程池的詳細說明之外，它也可以方便理解線程池的內部。同樣的，您可以請求響應的節點的其它詳細說明。（例如 **ip**） | Field Name（字段名） | Alias（別名） | 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 |