[jira] [Assigned] (HDFS-17094) EC: Fix bug in block recovery when there are stale datanodes

["Shuyan Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-17094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shuyan Zhang reassigned HDFS-17094:
-----------------------------------

    Assignee: Shuyan Zhang

> 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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