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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5728) [Diskfull] Block recovery will fail if the metafile does not have crc for all chunks of the block
Date Fri, 24 Jan 2014 23:01:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881518#comment-13881518
] 

Kihwal Lee commented on HDFS-5728:
----------------------------------

I've committed this to trunk and branch-2. Thank you for reporting and working on the patch,
Vinay. Thanks for the reveiw, Uma.

> [Diskfull] Block recovery will fail if the metafile does not have crc for all chunks
of the block
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5728
>                 URL: https://issues.apache.org/jira/browse/HDFS-5728
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 0.23.10, 2.2.0
>            Reporter: Vinay
>            Assignee: Vinay
>            Priority: Critical
>             Fix For: 3.0.0, 2.4.0
>
>         Attachments: HDFS-5728.patch, HDFS-5728.patch, HDFS-5728.patch
>
>
> 1. Client (regionsever) has opened stream to write its WAL to HDFS. This is not one time
upload, data will be written slowly.
> 2. One of the DataNode got diskfull ( due to some other data filled up disks)
> 3. Unfortunately block was being written to only this datanode in cluster, so client
write has also failed.
> 4. After some time disk is made free and all processes are restarted.
> 5. Now HMaster try to recover the file by calling recoverLease. 
> At this time recovery was failing saying file length mismatch.
> When checked,
>  actual block file length: 62484480
>  Calculated block length: 62455808
> This was because, metafile was having crc for only 62455808 bytes, and it considered
62455808 as the block size.
> No matter how many times, recovery was continously failing.



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