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Date: Mon, 20 Apr 2015 00:24:58 +0000 (UTC)
From: "Kai Zheng (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12770054.1422270142000.43258.1429489498868@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-7678) Erasure coding: DFSInputStream with
 decode functionality
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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 ] 

Kai Zheng commented on HDFS-7678:
---------------------------------

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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