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https://issues.apache.org/jira/browse/HDFS-17154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved HDFS-17154.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
> 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
> Fix For: 3.4.0
>
>
> 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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