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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8139) Refine or extend EC command to support all cases
Date Mon, 13 Apr 2015 23:20:12 GMT
Kai Zheng created HDFS-8139:

             Summary: Refine or extend EC command to support all cases
                 Key: HDFS-8139
                 URL: https://issues.apache.org/jira/browse/HDFS-8139
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Kai Zheng
            Assignee: Vinayakumar B

Currently a {{CODEC}} command is used to distribute stripping recovery command to DataNode.
Discussed with [~umamaheswararao] and [~vinayrpet] further, we may need to refine or extend
the command to support all cases, as we may distribute encoding and recovering tasks in both
stripping and non-stripping cases. We may have two ways: 1) a single command but uses a flag
in it to denote all the cases; 2) more commands.

This will also consider how to layout, optimize or document relevant info contained in the
the corresponding command related to the block group, so DataNode will be able to restore
such info according to the concrete command.

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