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litieqiao commented on HBASE-13376: ----------------------------------- hi ,Vandana Ayyalasomayajula. thank you for your Share. I have fixed my hbase cluster's balancer problem with this patch.than you very much. when i was try to balance manually,i seem than it need a little code change in the function getLeastLoadedTopServerForRegion(int region) of BaseLoadBalancer.java (org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java) ---------------------------------- 1)before modify int index = serversToIndex.get(sn); 2)after modify int index = serversToIndex.get(sn.getHostAndPort()); ---------------------------------- is that true? thank you for your attention.3ks. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)