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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12483) Provide a configuration to adjust the weight of EC recovery tasks to adjust the speed of recovery
Date Mon, 18 Sep 2017 20:53:12 GMT
Lei (Eddy) Xu created HDFS-12483:
------------------------------------

             Summary: Provide a configuration to adjust the weight of EC recovery tasks to
adjust the speed of recovery
                 Key: HDFS-12483
                 URL: https://issues.apache.org/jira/browse/HDFS-12483
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: erasure-coding
    Affects Versions: 3.0.0-alpha4
            Reporter: Lei (Eddy) Xu
            Assignee: Lei (Eddy) Xu
            Priority: Minor


The relative speed of EC recovery comparing to 3x replica recovery is a function of (EC codec,
number of sources, NIC speed, and CPU speed, and etc). 

Currently the EC recovery has a fixed {{xmitsInProgress}} of {{max(# of sources, # of targets)}}
comparing to {{1}} for 3x replica recovery, and NN uses {{xmitsInProgress}} to decide how
much recovery tasks to schedule to the DataNode this we can add a coefficient for user to
tune the weight of EC recovery tasks.



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