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https://issues.apache.org/jira/browse/HDFS-17154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17755031#comment-17755031
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ASF GitHub Bot commented on HDFS-17154:
---------------------------------------
Hexiaoqiao merged PR #5941:
URL: https://github.com/apache/hadoop/pull/5941
> EC: Fix bug in updateBlockForPipeline after failover
> ----------------------------------------------------
>
> Key: HDFS-17154
> URL: https://issues.apache.org/jira/browse/HDFS-17154
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Shuyan Zhang
> Assignee: Shuyan Zhang
> Priority: Major
> Labels: pull-request-available
>
> In the method `updateBlockForPipeline`, NameNode uses the
> `BlockUnderConstructionFeature` of a BlockInfo to generate the member
> `blockIndices` of `LocatedStripedBlock`.
> And then, NameNode uses `blockIndices` to generate block tokens for client.
> However, if there is a failover, the location info in
> BlockUnderConstructionFeature may be incomplete, which results in the absence
> of the corresponding block tokens.
> When the client receives these incomplete block tokens, it will throw a NPE
> because `updatedBlks[i]` is null.
> NameNode should just return block tokens for all indices to the client.
> Client can pick whichever it likes to use.
>
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