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https://issues.apache.org/jira/browse/HDFS-17094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17744833#comment-17744833
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ASF GitHub Bot commented on HDFS-17094:
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tomscut merged PR #5854:
URL: https://github.com/apache/hadoop/pull/5854
> EC: Fix bug in block recovery when there are stale datanodes
> ------------------------------------------------------------
>
> Key: HDFS-17094
> URL: https://issues.apache.org/jira/browse/HDFS-17094
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Shuyan Zhang
> Assignee: Shuyan Zhang
> Priority: Major
> Labels: pull-request-available
>
> When a block recovery occurs, `RecoveryTaskStriped` in datanode expects
> `rBlock.getLocations()` and `rBlock. getBlockIndices()` to be in one-to-one
> correspondence. However, if there are locations in stale state when NameNode
> handles heartbeat, this correspondence will be disrupted. In detail, there is
> no stale location in `recoveryLocations`, but the block indices array is
> still complete (i.e. contains the indices of all the locations). This will
> cause `BlockRecoveryWorker.RecoveryTaskStriped#recover` to generate a wrong
> internal block ID, and the corresponding datanode cannot find the replica,
> thus making the recovery process fail. This bug needs to be fixed.
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