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https://issues.apache.org/jira/browse/HDFS-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14502185#comment-14502185
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Kai Zheng commented on HDFS-7678:
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Hi [~zhz], a very good question! You just reminded me of something planned to
do long before, :). I opened HADOOP-11847 to address it. I will make my answer
to your question as part of the API (in codes comment). Thanks!
> Erasure coding: DFSInputStream with decode functionality
> --------------------------------------------------------
>
> Key: HDFS-7678
> URL: https://issues.apache.org/jira/browse/HDFS-7678
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Li Bo
> Assignee: Zhe Zhang
> Attachments: BlockGroupReader.patch, HDFS-7678.000.patch
>
>
> A block group reader will read data from BlockGroup no matter in striping
> layout or contiguous layout. The corrupt blocks can be known before
> reading(told by namenode), or just be found during reading. The block group
> reader needs to do decoding work when some blocks are found corrupt.
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