[jira] [Created] (HDFS-13863) FsDatasetImpl should log DiskOutOfSpaceException

["Fei Hui (JIRA)" <ji...@apache.org>]

Fei Hui created HDFS-13863:
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             Summary: FsDatasetImpl should log DiskOutOfSpaceException
                 Key: HDFS-13863
                 URL: https://issues.apache.org/jira/browse/HDFS-13863
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs
    Affects Versions: 3.0.3, 2.9.1, 3.1.0
            Reporter: Fei Hui
            Assignee: Fei Hui


The code in function *createRbw* as follow
{code:java}
        try {
          // First try to place the block on a transient volume.
          ref = volumes.getNextTransientVolume(b.getNumBytes());
          datanode.getMetrics().incrRamDiskBlocksWrite();
        } catch (DiskOutOfSpaceException de) {
          // Ignore the exception since we just fall back to persistent storage.
        } finally {
          if (ref == null) {
            cacheManager.release(b.getNumBytes());
          }
        }
{code}
I think we should log the exception because it took me long time to resolve problems, and maybe others face the same problems.
When i test ram_disk, i found no data was written into randomdisk. I debug, deep into the source code, and found that randomdisk size was less than reserved space. I think if message was logged, i would resolve the problem quickly.




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