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https://issues.apache.org/jira/browse/HDFS-7348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518935#comment-14518935
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Li Bo commented on HDFS-7348:
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We can give two working modes to the recovery work, Fast, or Slow. For slow
mode, we read blocks(or cells) in sequence for a decode calculation, then write
to disk. After finished, we send blocks one by one. For fast mode, we read
blocks in parallel and directly sends them to destinations without storing on
local disk. The selection of mode is based on factors such as the network
status, the burden of datanode who takes the recovery task, etc .
> Erasure Coding: striped block recovery
> --------------------------------------
>
> Key: HDFS-7348
> URL: https://issues.apache.org/jira/browse/HDFS-7348
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Reporter: Kai Zheng
> Assignee: Yi Liu
> Attachments: ECWorker.java, HDFS-7348.001.patch
>
>
> This JIRA is to recover one or more missed striped block in the striped block
> group.
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