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https://issues.apache.org/jira/browse/HDFS-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933658#action_12933658
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Hairong Kuang commented on HDFS-1476:
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I thought more about this. ProcessMisReplicatedBlocks scans all blocks in NN
during which holding the namesystem write lock. This will block the processing
of block reports. It would be nice if it can release the lock periodically.
> listCorruptFileBlocks should be functional while the name node is still in
> safe mode
> ------------------------------------------------------------------------------------
>
> Key: HDFS-1476
> URL: https://issues.apache.org/jira/browse/HDFS-1476
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Patrick Kling
> Assignee: Patrick Kling
> Attachments: HDFS-1476.2.patch, HDFS-1476.3.patch, HDFS-1476.patch
>
>
> 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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