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https://issues.apache.org/jira/browse/HADOOP-1838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HADOOP-1838:
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Attachment: blockSizeZero.patch
If the blocksize is zero then return the size of the first block as the
"blocksize".
> Files created with an pre-0.15 gets blocksize as zero, causing performance
> degradation
> --------------------------------------------------------------------------------------
>
> Key: HADOOP-1838
> URL: https://issues.apache.org/jira/browse/HADOOP-1838
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.15.0
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: blockSizeZero.patch
>
>
> HADOOP-1656 introduced the support for storing block size persistently as
> inode metadata. Previously, if the file has only one block then it was not
> possible to accurately determine the blocksize that the application has
> requested at file-creation time.
> The upgrade of an older layout to the new layout kept the blocksize as zero
> for single-block files that were upgraded to the new layout. This was done to
> indicate the DFS really does not know the "true" blocksize of this file. This
> caused map-reduce to determine that a split is 1 byte in length!
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