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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12482) Provide a configuration to adjust the weight of EC recovery tasks to adjust the speed of recovery
Date Thu, 19 Oct 2017 18:51:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211538#comment-16211538
] 

Hadoop QA commented on HDFS-12482:
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-12482 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12893089/HDFS-12482.01.patch
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| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/21749/console |
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> Provide a configuration to adjust the weight of EC recovery tasks to adjust the speed
of recovery
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-12482
>                 URL: https://issues.apache.org/jira/browse/HDFS-12482
>             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
>              Labels: hdfs-ec-3.0-nice-to-have
>         Attachments: HDFS-12482.00.patch, HDFS-12482.01.patch
>
>
> 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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