[jira] [Created] (HDFS-5022) Add explicit error message in log when datanode went out of service because of low disk space

["Yu Li (JIRA)" <ji...@apache.org>]

Yu Li created HDFS-5022:
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             Summary: Add explicit error message in log when datanode went out of service because of low disk space
                 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 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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