hadoop-hdfs-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8453) Erasure coding: properly assign start offset for internal blocks in a block group
Date Thu, 21 May 2015 17:36:18 GMT
Zhe Zhang created HDFS-8453:
-------------------------------

             Summary: 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)}}. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message