[jira] [Reopened] (HDFS-8818) Allow Balancer to run faster

["Kihwal Lee (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-8818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kihwal Lee reopened HDFS-8818:
------------------------------

Reopening for revert. git won't revert it cleanly since there have been other changes since the commit.  I manually reverted the changes, except for some of the non-core changes for configs and logging.  Those seem to worth keeping.  The balancer with the revert is being tested on a 2,400 node cluster.

> 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: 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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