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From "Patrick Kling (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1476) listCorruptFileBlocks should be functional while the name node is still in safe mode
Date Mon, 25 Oct 2010 20:52:20 GMT
listCorruptFileBlocks should be functional while the name node is still in safe mode
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                 Key: HDFS-1476
                 URL: https://issues.apache.org/jira/browse/HDFS-1476
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Patrick Kling


This would allow us to detect whether missing blocks can be fixed using Raid and if that is
the case exit safe mode earlier.

One way to make listCorruptFileBlocks available before the name node has exited from safe
mode would be to perform a scan of the blocks map on each call to listCorruptFileBlocks to
determine if there are any blocks with no replicas. This scan could be parallelized by dividing
the space of block IDs into multiple intervals than can be scanned independently.

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