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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1951) 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
Date Tue, 24 May 2011 14:15:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038578#comment-13038578
] 

ramkrishna.s.vasudevan commented on HDFS-1951:
----------------------------------------------

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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