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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