就像mysql一样，发现慢查询对优化性能以及线上排除故障非常重要。
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[2018-02-08T09:23:09,357][DEBUG][o.e.a.s.TransportSearchAction] [node-110] [195737742] Failed to execute fetch phase org.elasticsearch.transport.RemoteTransportException: [node-111][192.168.20.111:9300][indices:data/read/search[phase/fetch/id]] Caused by: org.elasticsearch.common.util.concurrent.EsRejectedExecutionException: rejected execution of org.elasticsearch.transport.TcpTransport$RequestHandler@762a3357 on EsThreadPoolExecutor[search, queue capacity = 1000, org.elasticsea rch.common.util.concurrent.EsThreadPoolExecutor@5fa58f86[Running, pool size = 13, active threads = 13, queued tasks = 1000, completed tasks = 305718666]] |
当出现慢查询时，ES的线程池就会被打满，产生如上的错误信息。
我们可以无需重启的配置ES开启慢查询日志：https://www.elastic.co/guide/cn/elasticsearch/guide/current/logging.html
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