liying created HDFS-14616:
-----------------------------

             Summary: Add the warn log when the volume available space isn't 
enough
                 Key: HDFS-14616
                 URL: https://issues.apache.org/jira/browse/HDFS-14616
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
    Affects Versions: 2.7.2
            Reporter: liying


In the hadoop2 version, there is no warning log that the disk is not available 
when using the disk. Therefore, the datanode log cannot be used to check if the 
disk is not available ata certain time or for other problems.



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