[jira] [Updated] (HDFS-1982) Null pointer exception is thrown when NN restarts with a block lesser in size than the block that is present in DN1 but the generation stamp is greater in the NN

["Allen Wittenauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated HDFS-1982:
-----------------------------------
    Fix Version/s:     (was: 0.20-append)

> Null pointer exception is thrown when NN restarts with a block lesser in size than the block that is present in DN1 but the generation stamp is greater in the NN 
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1982
>                 URL: https://issues.apache.org/jira/browse/HDFS-1982
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 0.20-append
>         Environment: Linux
>            Reporter: ramkrishna.s.vasudevan
>
> Conisder the following scenario. 
> WE have a cluster with one NN and 2 DN.
> We write some file.
> One of the block is written in DN1 but not yet completed in DN2 local disk.
> Now DN1 gets killed and so pipeline recovery happens for the block with the size as in DN2 but the generation stamp gets updated in the NN.
> DN2 also gets killed.
> Now restart NN and DN1
> Now if NN restarts, the block that NN has greater time stamp but the size is lesser in the NN.
> This leads to Null pointer exception in addstoredblock api



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