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https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell reopened HBASE-13376:
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TestStochasticLoadBalancer is frequently failing in 0.98 branch so I am
reverting this commit from that branch.
{noformat}
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 234.069 sec <<<
FAILURE! - in org.apache.hadoop.hbase.master.balancer.\
TestStochasticLoadBalancer
testLargeCluster(org.apache.hadoop.hbase.master.balancer.TestStochasticLoadBalancer)
Time elapsed: 30.162 sec <<< FAILURE!
java.lang.AssertionError: null
at org.junit.Assert.fail(Assert.java:86)
at org.junit.Assert.assertTrue(Assert.java:41)
at org.junit.Assert.assertTrue(Assert.java:52)
at
org.apache.hadoop.hbase.master.balancer.BalancerTestBase.assertClusterAsBalanced(BalancerTestBase.java:79)
at
org.apache.hadoop.hbase.master.balancer.TestStochasticLoadBalancer.testWithCluster(TestStochasticLoadBalancer.java:393)
at
org.apache.hadoop.hbase.master.balancer.TestStochasticLoadBalancer.testLargeCluster(TestStochasticLoadBalancer.java:368)
{noformat}
> Improvements to Stochastic load balancer
> ----------------------------------------
>
> Key: HBASE-13376
> URL: https://issues.apache.org/jira/browse/HBASE-13376
> Project: HBase
> Issue Type: Improvement
> Components: Balancer
> Affects Versions: 1.0.0, 0.98.12
> Reporter: Vandana Ayyalasomayajula
> Assignee: Vandana Ayyalasomayajula
> Priority: Minor
> Fix For: 2.0.0, 1.3.0
>
> Attachments: 13376-v2.txt, 13376-v5.patch, 13376_4.patch,
> HBASE-13376.patch, HBASE-13376_0.98.txt, HBASE-13376_0.98_v2.patch,
> HBASE-13376_0.txt, HBASE-13376_1.txt, HBASE-13376_1_1.txt,
> HBASE-13376_2.patch, HBASE-13376_2_branch-1.patch, HBASE-13376_3.patch,
> HBASE-13376_3.patch, HBASE-13376_4.patch, HBASE-13376_5_branch-1.patch,
> HBASE-13376_6_branch-1.patch, HBASE-13376_98.patch,
> HBASE-13376_branch-1.patch, HBASE-13376_v3_0.98.patch,
> HBASE-13376_v4_0.98.patch
>
>
> There are two things this jira tries to address:
> 1. The locality picker in the stochastic balancer does not pick regions with
> least locality as candidates for swap/move. So when any user configures
> locality cost in the configs, the balancer does not always seems to move
> regions with bad locality.
> 2. When a cluster has equal number of loaded regions, it always picks the
> first one. It should pick a random region on one of the equally loaded
> servers. This improves a chance of finding a good candidate, when load picker
> is invoked several times.
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