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https://issues.apache.org/jira/browse/HDFS-6964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee resolved HDFS-6964.
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Resolution: Duplicate
> NN fails to fix under replication leading to data loss
> ------------------------------------------------------
>
> Key: HDFS-6964
> URL: https://issues.apache.org/jira/browse/HDFS-6964
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.0.0-alpha, 3.0.0-alpha1
> Reporter: Daryn Sharp
> Priority: Blocker
>
> We've encountered lost blocks due to node failure even when there is ample
> time to fix the under-replication.
> 2 nodes were lost. The 3rd node with the last remaining replicas averaged 1
> copy block per heartbeat (3s) until ~7h later when that node was lost
> resulting in over 50 lost blocks. When the node was restarted and sent its
> BR the NN immediately began fixing the replication.
> In another data loss event, over 150 blocks were lost due to node failure but
> the timing of the node loss is not known so there may have been inadequate
> time to fix the under-replication unlike the first case.
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