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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7344) [umbrella] Erasure Coding worker and support in DataNode
Date Wed, 18 Jan 2017 23:08:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15828945#comment-15828945
] 

Andrew Wang commented on HDFS-7344:
-----------------------------------

[~zhz] I could use some help triaging this JIRA.  I'd like to resolve this umbrella since
ECWorker seems functional, but there are still 4 unresolved subtasks. What do you recommend
we do with the remaining subtasks?

> [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-ec-datanode.0108.zip, hdfs-ec-datanode.0108.zip,
HDFS ECWorker Design.pdf
>
>
> 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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