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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1345) Checksum object does not get restored to the old state in retries when handle ChecksumException
Date Thu, 10 May 2007 16:47:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494787
] 

Raghu Angadi commented on HADOOP-1345:
--------------------------------------

+1. Looks good.


> Checksum object does not get restored to the old state in retries when handle ChecksumException
> -----------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1345
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1345
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.12.3
>            Reporter: Hairong Kuang
>         Assigned To: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.13.0
>
>         Attachments: checksum.patch, checksum.patch
>
>
> In ChecksumFile.FSInputChecker, when a ChecksumException occurs, it tries to recover
from the error by reading a different replica. However, the current code does not restore
the Checksum object's old state. This causes a read not able to recover from ChecksumException
although there are non-corrupted replicas available if the read follows a seek to a position
which is not at the checksum chunk boundary . 

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