Shuyan Zhang created HDFS-17154:
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Summary: 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
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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