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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7678) Erasure coding: DFSInputStream with decode functionality (pread)
Date Wed, 06 May 2015 23:39:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14531692#comment-14531692
] 

Zhe Zhang commented on HDFS-7678:
---------------------------------

Thanks for the feedback Jing. 

It turns out that the test will fail because because on the codec level we can only decode
with all parity blocks present. HADOOP-11566 will address it. To reduce dependency on codec
and output stream, I will keep adding tests to {{TestReadStripedFile}} (would be great if
you can review HDFS-8334 first) instead of the end-to-end test.

> Erasure coding: DFSInputStream with decode functionality (pread)
> ----------------------------------------------------------------
>
>                 Key: HDFS-7678
>                 URL: https://issues.apache.org/jira/browse/HDFS-7678
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7285
>            Reporter: Li Bo
>            Assignee: Zhe Zhang
>         Attachments: BlockGroupReader.patch, HDFS-7678-HDFS-7285.002.patch, HDFS-7678-HDFS-7285.003.patch,
HDFS-7678-HDFS-7285.004.patch, HDFS-7678-HDFS-7285.005.patch, HDFS-7678-HDFS-7285.006.patch,
HDFS-7678-HDFS-7285.007.patch, HDFS-7678-HDFS-7285.008.patch, HDFS-7678-HDFS-7285.009.patch,
HDFS-7678-HDFS-7285.010.patch, HDFS-7678.000.patch, HDFS-7678.001.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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