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https://issues.apache.org/jira/browse/HADOOP-3514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622658#action_12622658
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Raghu Angadi commented on HADOOP-3514:
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> 4) The CheckSumInputStream.read needs to read in a loop until it gets the len
> amount of data or EOF.
We already have IOUtils.readFully(). Usually a read() that does implicit
'readFully()' causes more problems than problems it solves... IMO many of
hadoop's read's do this unnecessarily.
> Reduce seeks during shuffle, by inline crcs
> -------------------------------------------
>
> Key: HADOOP-3514
> URL: https://issues.apache.org/jira/browse/HADOOP-3514
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.18.0
> Reporter: Devaraj Das
> Assignee: Jothi Padmanabhan
> Fix For: 0.19.0
>
> Attachments: hadoop-3514-v1.patch, hadoop-3514-v2.patch,
> hadoop-3514-v3.patch, hadoop-3514-v4.patch, hadoop-3514-v5.patch,
> hadoop-3514-v6.patch, hadoop-3514-v7.patch, hadoop-3514.patch
>
>
> The number of seeks can be reduced by half in the iFile if we move the crc
> into the iFile rather than having a separate file.
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