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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7678) Erasure coding: DFSInputStream with decode functionality
Date Mon, 04 May 2015 22:25:07 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhe Zhang updated HDFS-7678:
----------------------------
    Attachment: HDFS-7678-HDFS-7285.008.patch

Rebased after HDFS-8281. 

[~jingzhao] Since {{ReadPortion}} is just a util class I intentionally changed its fields
to be public so as to avoid calling getter and setters. Let me know if it looks OK to you.


I was working on both HDFS-7678 and HDFS-8282 at the same time so {{containsReadPortion}}
appeared there without usage. Adding it back in this patch.

> 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
>    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-7678.000.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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