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Posted to hdfs-issues@hadoop.apache.org by "Li Bo (JIRA)" <ji...@apache.org> on 2015/01/26 12:12:34 UTC

[jira] [Commented] (HDFS-7678) Block group reader with decode functionality

    [ https://issues.apache.org/jira/browse/HDFS-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291701#comment-14291701 ] 

Li Bo commented on HDFS-7678:
-----------------------------

This code has not synced with Codec and Namenode code, so I use BlockGroupHelper and CodecHelper when I want to call some functions about codec and BlockGroup. Still a lot of work to do, such as add BlockGroupContiguousReader which read a block group in contiguous layout,  and unit tests .

> Block group reader 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: Li Bo
>         Attachments: BlockGroupReader.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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