[jira] [Created] (HDFS-17154) EC: Fix bug in updateBlockForPipeline after failover

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

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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