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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1124) ChecksumFileSystem does not handle ChecksumError correctly
Date Tue, 08 May 2007 18:32:15 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-1124:
-------------------------------------

    Priority: Blocker  (was: Major)

Possible blocker for 0.13 release. Investigation in progress.

> ChecksumFileSystem does not handle ChecksumError correctly
> ----------------------------------------------------------
>
>                 Key: HADOOP-1124
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1124
>             Project: Hadoop
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.12.0
>            Reporter: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.13.0
>
>
> When handle ChecksumError, the checksumed file system tries to recover by rereading from
a different replica.
> I have three comments:
> 1. One bug in the code is that when retrying, the object that computes checksum does
not get restored to the old state.
> 2. The code also assumes that the first byte read and the byte being read when ChecksumError
occurs are in the same block. 
> 3. It would be more efficient if we roll back to the first byte in the chunk that's being
checksumed instead of rolling back to the first byte that was read.

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