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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HDFS-8453) Erasure coding: properly assign start offset for internal blocks in a block group
Date Thu, 21 May 2015 17:37:17 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HDFS-8453 started by Zhe Zhang.
---------------------------------------
> Erasure coding: properly assign start offset for internal blocks in a block group
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-8453
>                 URL: https://issues.apache.org/jira/browse/HDFS-8453
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>
> {{LocatedBlock#offset}} should indicate the "offset of the first byte of the block in
the file". In a striped block group, we should properly assign this {{offset}} for internal
blocks, so each internal block can be identified from a given offset.
> My current plan is to keep using {{bg.getStartOffset() + idxInBlockGroup * cellSize}}
as the start offset for data blocks. For parity blocks, use {{-1 * (bg.getStartOffset() +
idxInBlockGroup * cellSize)}}. 



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