NodeManager healthy check includes script health checker and local dir checker.

houzhizhen

于 2018-02-26 10:16:47 发布

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分类专栏： hadoop-yarn

本文链接：https://blog.youkuaiyun.com/houzhizhen/article/details/79373973

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本文介绍了NodeManager的健康检查机制，主要包括脚本健康检查器和本地目录检查器。默认情况下，脚本健康检查器每5分钟运行一次，而本地目录检查器每2分钟运行一次。此外，还详细阐述了NodeHealthCheckerService.isHealthy方法的具体实现。

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NodeMananger healthy check includes script health checker and local dir checker.

By default, script health checker runs every 5 minutes, and local dir checker runss every 2 minutes.

NodeHealthCheckerService.isHealthy

boolean isHealthy() {
    boolean scriptHealthStatus = (nodeHealthScriptRunner == null) ? true
        : nodeHealthScriptRunner.isHealthy();
    return scriptHealthStatus && dirsHandler.areDisksHealthy();
  }