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From Doug Cutting <cutt...@apache.org>
Subject Re: [jira] Updated: (HADOOP-1124) ChecksumFileSystem does not handle ChecksumError correctly
Date Fri, 11 May 2007 17:59:52 GMT
Shouldn't this be targeted for 0.14?

Doug

Hairong Kuang (JIRA) wrote:
>      [ https://issues.apache.org/jira/browse/HADOOP-1124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
> 
> Hairong Kuang updated HADOOP-1124:
> ----------------------------------
> 
>     Priority: Major  (was: Blocker)
> 
>> 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
>>         Assigned To: Hairong Kuang
>>             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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