为什么 Hadoop 报告“Unhealthy Node local-dirs and log-dirs are bad"? [英] Why does Hadoop report "Unhealthy Node local-dirs and log-dirs are bad"?

问题描述

我正在尝试在我的 PC 上设置一个单节点 Hadoop 2.6.0 集群.

I am trying to setup a single-node Hadoop 2.6.0 cluster on my PC.

在访问 http://localhost:8088/cluster 时，我发现我的节点被列为不健康的节点".

On visiting http://localhost:8088/cluster, I find that my node is listed as an "unhealthy node".

在健康报告中，它提供了错误:

In the health report, it provides the error:

1/1 local-dirs are bad: /tmp/hadoop-hduser/nm-local-dir; 
1/1 log-dirs are bad: /usr/local/hadoop/logs/userlogs

怎么了?

推荐答案

local-dirs are bad 最常见的原因是节点上的可用磁盘空间超过了yarn的max-disk-utilization-per-disk-percentage 默认值 90.0%.

The most common cause of local-dirs are bad is due to available disk space on the node exceeding yarn's max-disk-utilization-per-disk-percentage default value of 90.0%.

要么清理运行不健康节点的磁盘，要么在yarn-site.xml

Either clean up the disk that the unhealthy node is running on, or increase the threshold in yarn-site.xml

<property>
  <name>yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage</name>
  <value>98.5</value>
</property>

避免禁用磁盘检查，因为当磁盘最终耗尽空间或存在权限问题时，您的作业可能会失败.参考 yarn-site.xml 磁盘检查器部分了解更多详情.

Avoid disabling disk check, because your jobs may failed when the disk eventually run out of space, or if there are permission issues. Refer to the yarn-site.xml Disk Checker section for more details.

如果您怀疑目录中存在文件系统错误，您可以通过运行来检查

If you suspect there is filesystem error on the directory, you can check by running

hdfs fsck /tmp/hadoop-hduser/nm-local-dir

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