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

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

     [ https://issues.apache.org/jira/browse/HDFS-17154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shuyan Zhang reassigned HDFS-17154:
-----------------------------------

    Assignee: Shuyan Zhang

> 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
>
> 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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