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今天早上的报表没有出来,报表是从用 hadoop 进行跑的 一看 hadoop 相关日志,报如下错误 Message: org.apache.hadoop.ipc.RemoteException: java.io.IOException: org.apache.hadoop.fs.FSError: java.io.IOException: No space left on device 咋一看, 以为

今天早上的报表没有出来,报表是从用 hadoop 进行跑的
一看 hadoop 相关日志,报如下错误

<code>Message: org.apache.hadoop.ipc.RemoteException: java.io.IOException: org.apache.hadoop.fs.FSError: java.io.IOException: No space left on device
</code>

咋一看, 以为是 hdfs没空间了,运行如下命令

<code>    hadoop dfsadmin -report
    Configured Capacity: 44302785945600 (40.29 TB)
    Present Capacity: 42020351946752 (38.22 TB)
    DFS Remaining: 8124859072512 (7.39 TB)
    DFS Used: 33895492874240 (30.83 TB)
    DFS Used%: 80.66%
    Under replicated blocks: 1687
    Blocks with corrupt replicas: 0
    Missing blocks: 0
</code>

从输出的结果来看,dfs的空间还很大,所以”No space left on device”这样的错误应该不是hdfs的问题
应该是本地磁盘的问题,发现hadoop运行时,要用到一个临时目录,可以在core-site.xml文件中配置

<code>hadoop.tmp.dir
</code>

默认的路径是 /tmp/hadoop-${user.name}
看了一下 /tmp/的空间,确实很小了,把hadoop.tmp.dir挂到一个大一点的盘上就可以了
hadoop.tmp.dir是其它临时目录的父目录
但是一个问题还没有解决, hadoop.tmp.dir到底需要多大空间呢?怎么样计算呢?

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