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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2009/11/28 05:56:20 UTC

[jira] Created: (HDFS-788) Datanode behaves badly when one disk is very low on space

Datanode behaves badly when one disk is very low on space
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                 Key: HDFS-788
                 URL: https://issues.apache.org/jira/browse/HDFS-788
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
            Reporter: Todd Lipcon


FSDataset.getNextVolume() uses FSVolume.getAvailable() to determine whether to allocate a block on a volume. This doesn't factor in other in-flight blocks that have been "promised" space on the volume. The resulting issue is that, if a volume is nearly full but not full, multiple blocks will be allocated on that volume, and then they will all hit "Out of space" errors during the write.

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