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https://issues.apache.org/jira/browse/HDFS-7344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499030#comment-14499030
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Kai Zheng commented on HDFS-7344:
---------------------------------
I forgot to mention that [~zhz] and our side are tracking this aspect. The
required tasks listed here also under HDFS-7285 were started already though no
solid progress shows up yet.
> 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, and implements ECWorker. The handled
> use cases:
> * Converting replica blocks into stripping erasure coding blocks;
> * Converting replica blocks into non-stripping erasure coding blocks;
> * Recovering erased stripping erasure coding blocks;
> * Recovering erased non-stripping erasure coding blocks;
> * On-demand recovering serving client request for erased non-stripping
> erasure coding blocks.
> 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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