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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8818) Allow Balancer to run faster
Date Wed, 03 May 2017 18:15:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995369#comment-15995369
] 

Tsz Wo Nicholas Sze commented on HDFS-8818:
-------------------------------------------

> ... However, please do realize that it will be a regression for many other users. ...

I believe this statement is incorrect.  The new design is more flexible than the previous
one since we can control the number of thread per datanode pair.

BTW, using the default configuration may not give us performance since we want the balancing
activities not affecting the normal cluster activities and the running jobs.

> ... which cannot be worked around with config tweaks. ...

What are the config used exactly?

> Allow Balancer to run faster
> ----------------------------
>
>                 Key: HDFS-8818
>                 URL: https://issues.apache.org/jira/browse/HDFS-8818
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer & mover
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>             Fix For: 2.8.0, 2.7.4, 3.0.0-alpha1
>
>         Attachments: bal1.png, bal2.png, h8818_20150723.patch, h8818_20150727.patch,
HDFS-8818-branch-2.7.00.patch
>
>
> The original design of Balancer is intentionally to make it run slowly so that the balancing
activities won't affect the normal cluster activities and the running jobs.
> There are new use case that cluster admin may choose to balance the cluster when the
cluster load is low, or in a maintain window.  So that we should have an option to allow Balancer
to run faster.



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