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https://issues.apache.org/jira/browse/HADOOP-11566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532487#comment-14532487
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Kai Zheng commented on HADOOP-11566:
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Hi Vinay,
Thanks for your good question. Yes the order is important as the underlying raw
decoder requires that. The order is: parity units first, then data units, as
consistent with raw decoder. Please note the input units and output units are
guided by the {{erasedIndexes}} which is carefully computed as indexes into the
inputs array (parity units + data units).
> Add tests and fix for erasure coders to recover erased parity units
> --------------------------------------------------------------------
>
> Key: HADOOP-11566
> URL: https://issues.apache.org/jira/browse/HADOOP-11566
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Kai Zheng
> Assignee: Kai Zheng
> Attachments: HADOOP-11566-HDFS-7285-v2.patch, HADOOP-11566-v1.patch
>
>
> Discussing with [~zhz] in HADOOP-11542: it's planned to have follow up a JIRA
> to enhance the tests for parity chunks as well. Like erasedDataIndexes,
> erasedParityIndexes will be added to specify which parity units are to be
> erased and recovered then.
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