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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HBASE-13376) Improvements to Stochastic load balancer
Date Wed, 26 Aug 2015 04:55:47 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell reopened HBASE-13376:
------------------------------------

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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