[jira] [Comment Edited] (HDFS-10625) VolumeScanner to report why a block is found bad

["Yongjun Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-10625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15377247#comment-15377247 ] 

Yongjun Zhang edited comment on HDFS-10625 at 7/14/16 4:44 PM:
---------------------------------------------------------------

Thanks [~shahrs87] for the patch and [~jojochuang] for the comment.

It'd be nice to include the length of the replica, visible length, ondisk length etc in the report too. Suggest to use the same method used here (see HDFS-10587),
 
{code}
016-04-15 22:03:05,066 INFO org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl: Recovering ReplicaBeingWritten, blk_1556997324_1100153495099, RBW
getNumBytes() = 41381376
getBytesOnDisk() = 41381376
getVisibleLength()= 41186444
getVolume() = /hadoop-i/data/current
getBlockFile() = /hadoop-i/data/current/BP-1043567091-10.1.1.1-1343682168507/current/rbw/blk_1556997324
bytesAcked=41186444
bytesOnDisk=41381376
{code}




was (Author: yzhangal):
Thanks [~shahrs87] for the patch and [~jojochuang] for the comment.

It'd be nice to include the length of the replica in the report too.


>  VolumeScanner to report why a block is found bad
> -------------------------------------------------
>
>                 Key: HDFS-10625
>                 URL: https://issues.apache.org/jira/browse/HDFS-10625
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, hdfs
>            Reporter: Yongjun Zhang
>            Assignee: Rushabh S Shah
>              Labels: supportability
>         Attachments: HDFS-10625.patch
>
>
> VolumeScanner may report:
> {code}
> WARN org.apache.hadoop.hdfs.server.datanode.VolumeScanner: Reporting bad blk_1170125248_96458336 on /d/dfs/dn
> {code}
> It would be helpful to report the reason why the block is bad, especially when the block is corrupt, where is the first corrupted chunk in the block.



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