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https://issues.apache.org/jira/browse/HBASE-17462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834015#comment-15834015
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Hudson commented on HBASE-17462:
--------------------------------
FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #2369 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/2369/])
HBASE-17462 Use sliding window for read/write request costs in (tedyu: rev
7754a9620eff44d1d570fda534f9159a756310cd)
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestStochasticLoadBalancer.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
> Use sliding window for read/write request costs in StochasticLoadBalancer
> -------------------------------------------------------------------------
>
> Key: HBASE-17462
> URL: https://issues.apache.org/jira/browse/HBASE-17462
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
> Assignee: Tim Brown
> Labels: patch
> Fix For: 2.0.0, 1.4.0
>
> Attachments: after_changes.png, before_changes.png,
> HBASE-17462.patch, HBASE-17462-v2.patch
>
>
> In the thread, http://search-hadoop.com/m/HBase/YGbbyUZKXWALkX1, Timothy was
> asking whether the read/write request costs in StochasticLoadBalancer should
> be calculated as rates.
> This makes sense since read / write load on region server tends to fluctuate
> over time. Using sliding window would reflect more recent trend in read /
> write load.
> Some factors to consider:
> The data structure used by StochasticLoadBalancer should be concise. The
> number of regions in a cluster can be expected to approach 1 million. We
> cannot afford to store long history of read / write requests in master.
> Efficiency of cost calculation should be high - there're many cost
> functions the balancer goes through, it is expected for each cost function
> to return quickly. Otherwise we would not come up with proper region
> movement plan(s) in time.
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