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https://issues.apache.org/jira/browse/HDFS-1951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038578#comment-13038578
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ramkrishna.s.vasudevan commented on HDFS-1951:
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Applicable in 0.20-append branch.
> Null pointer exception comes when Namenode recovery happens and there is no
> response from client to NN more than the hardlimit for NN recovery and the
> current block is more than the prev block size in NN
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-1951
> URL: https://issues.apache.org/jira/browse/HDFS-1951
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20-append
> Reporter: ramkrishna.s.vasudevan
> Fix For: 0.20-append
>
> Attachments: HDFS-1951.patch
>
>
> Null pointer exception comes when Namenode recovery happens and there is no
> response from client to NN more than the hardlimit for NN recovery and the
> current block is more than the prev block size in NN
> 1. Write using a client to 2 datanodes
> 2. Kill one data node and allow pipeline recovery.
> 3. write somemore data to the same block
> 4. Parallely allow the namenode recovery to happen
> Null pointer exception will come in addStoreBlock api.
>
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