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https://issues.apache.org/jira/browse/HDFS-8818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996738#comment-15996738
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Kihwal Lee commented on HDFS-8818:
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bq. Do you have HDFS-8824 in your runs? I suspect the first run has it but
the second one does not.
It is the up-to-date branch-2.8, so all runs had it. About HDFS-8824, you do
realize that over time older nodes will end up with only small blocks, if it is
set permanently? It will look good for quick balancing, but may not be good in
long term. We run with the min block size set to 1.
bq. The performance did have been improved around 100x.
Can you reveal more details on the nature of the testing? It is unrealistic to
expect 100x in our typical use case with the base line being 2.7.
What was your config when you tested on the 500 node cluster? What was the
nature of imbalance? Did the default values work? If not, how did you get
there? Do you expect regular users to easily get there? At what point did you
hit HDFS-11377?
> 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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