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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10625) VolumeScanner to report why a block is found bad
Date Thu, 21 Jul 2016 01:56:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386985#comment-15386985
] 

Yiqun Lin commented on HDFS-10625:
----------------------------------

Hi, [~shahrs87], this jira is similar to HDFS-10626. Some codes are both changed in these
two jira. According to the latest comment from [~yzhangal] in HDFS-10626, I have also changed
the code from:
{code}
LOG.warn("Reporting bad {} on {}", block, volume.getBasePath());
{code}
to
{code}
LOG.warn("Reporting bad " + block + " with volume "
          + volume.getBasePath(), e);
{code}
I'm not sure if this line should be also changed in this jira? [~yzhangal], can take a look
for this, and make a coordination.

>  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-10625-1.patch, 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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