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https://issues.apache.org/jira/browse/HDFS-5022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13718229#comment-13718229
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Yu Li commented on HDFS-5022:
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Hi Jim,
It's my fault w/o mentioning the condition. According to my observation, if we
have set "dfs.datanode.du.reserved", and the free disk space hit the value,
then DN will run out of service silently, and no "No space left on device"
error will be thrown. I was observing this issue with hadoop 1.1.1
If you find this issue also covered by existing JIRAs, please let me know the
JIRA number, thanks.
> Add explicit error message in log when datanode went out of service because
> of free disk space hit "dfs.datanode.du.reserved"
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-5022
> URL: https://issues.apache.org/jira/browse/HDFS-5022
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Yu Li
> Assignee: Yu Li
> Priority: Minor
>
> Currently, if "dfs.datanode.du.reserved" is set and a datanode run out of
> configured disk space, it will become out of service silently, there's no way
> for user to analyze what happened to the datanode. Actually, user even won't
> notice the datanode is out-of-service, not any warning message in either
> namenode or datanode log.
> One example is if there's only one single datanode, and we are running a MR
> job writing huge data into HDFS, then when the disk is full, we can only
> observe error message like:
> {noformat}
> java.io.IOException: File xxx could only be replicated to 0 nodes instead of 1
> {noformat}
> and don't know what happened and how to resolve the issue.
> We need to improve this by adding more explicit error message in both
> datanode log and the message given to MR application.
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