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https://issues.apache.org/jira/browse/HDFS-8818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15997429#comment-15997429
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Tsz Wo Nicholas Sze commented on HDFS-8818:
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> 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.
In our tests, we ran balancer over a 500-node cluster. We were only able to
get ~5GB per minute before. Then, we were able to get ~500GB per minute after
a serious of balancer improvement including this. This JIRA is the most
critical since, without this, balancer schedules most the moves in the first
few datanode pairs and the remaining datanodes are mostly idle.
Below are the confs:
- Datanode
dfs.datanode.balance.max.concurrent.moves: 4 x #disks
dfs.datanode.balance.bandwidthPerSec: 10737418240 (=10GB)
- Balancer
dfs.datanode.balance.max.concurrent.moves: 4 x #disks
dfs.balancer.moverThreads: 20,000
dfs.balancer.max-size-to-move: 107374182400 (=100GB)
dfs.balancer.getBlocks.min-block-size: 104857600 (=100MB)
> 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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