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https://issues.apache.org/jira/browse/HDFS-8020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14395102#comment-14395102
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Zhe Zhang commented on HDFS-8020:
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I think the command is just to reconstruct a lost data in the group, which can
be either raw or parity. In a generic scenario, we might even construct both a
raw data block and a parity data blocks through the same command. [~drankye]
What 4 cases do you have in mind?
bq. Right. But we do have the class already (in the branch), or anything more
other than it did you mean?
Sorry I meant HDFS-7859. We need to represent ECSchemas in NN, and then we can
serialize and transfer the ECSchema to DN in a reconstruction command.
> Erasure Coding: restore BlockGroup and schema info from stripping coding
> command
> --------------------------------------------------------------------------------
>
> Key: HDFS-8020
> URL: https://issues.apache.org/jira/browse/HDFS-8020
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Kai Zheng
> Assignee: Kai Sasaki
>
> As a task of HDFS-7344, to process *stripping* coding commands from NameNode
> or other scheduler services/tools, we need to first be able to restore
> BlockGroup and schema information in DataNode, which will be used to
> construct coding work.
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