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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12040) Adjust inputs order for the decode API in raw erasure coder
Date Wed, 28 Oct 2015 08:32:28 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yi Liu updated HADOOP-12040:
----------------------------
          Resolution: Fixed
        Hadoop Flags: Reviewed
       Fix Version/s: 2.8.0
    Target Version/s: 2.8.0
              Status: Resolved  (was: Patch Available)

Committed to trunk and branch-2.

> Adjust inputs order for the decode API in raw erasure coder
> -----------------------------------------------------------
>
>                 Key: HADOOP-12040
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12040
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>             Fix For: 2.8.0
>
>         Attachments: HADOOP-12040-HDFS-7285-v1.patch, HADOOP-12040-v2.patch, HADOOP-12040-v3.patch,
HADOOP-12040-v4.patch
>
>
> Currently we used the parity units + data units order for the inputs, erasedIndexes and
outputs parameters in the decode call in raw erasure coder, which inherited from HDFS-RAID
due to impact enforced by {{GaliosField}}. As [~zhz] pointed and [~hitliuyi] felt, we'd better
change the order to make it natural for HDFS usage, where usually data blocks are before parity
blocks in a group. Doing this would avoid some reordering tricky logic.



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