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From "gao shan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7344) [umbrella] Erasure Coding worker and support in DataNode
Date Tue, 12 Jul 2016 09:57:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15372629#comment-15372629
] 

gao shan commented on HDFS-7344:
--------------------------------

I saw this issue was still "unresolved" . Does it mean, the current code can not  automatically
recover the data in a failed node ?  Although the data in the failed node could be reconstructed
when reading ,   data in the failed node which the namenode already found could not be automatically
written to another node  at present.  Right?  Thanks.

> [umbrella] Erasure Coding worker and support in DataNode
> --------------------------------------------------------
>
>                 Key: HDFS-7344
>                 URL: https://issues.apache.org/jira/browse/HDFS-7344
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Kai Zheng
>            Assignee: Li Bo
>         Attachments: ECWorker-design-v2.pdf, HDFS ECWorker Design.pdf, hdfs-ec-datanode.0108.zip,
hdfs-ec-datanode.0108.zip
>
>
> According to HDFS-7285 and the design, this handles DataNode side extension and related
support for Erasure Coding. More specifically, it implements {{ECWorker}}, which reconstructs
lost blocks (in striping layout).
> It generally needs to restore BlockGroup and schema information from coding commands
from NameNode or other entities, and construct specific coding work to execute. The required
block reader, writer, either local or remote, encoder and decoder, will be implemented separately
as sub-tasks. 
> This JIRA will track all the linked sub-tasks, and is responsible for general discussions
and integration for ECWorker. It won't resolve until all the related tasks are done.



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