[ https://issues.apache.org/jira/browse/HBASE-22300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Manning reassigned HBASE-22300: ------------------------------------- Assignee: David Manning > SLB doesn't perform well with increase in number of regions > ----------------------------------------------------------- > > Key: HBASE-22300 > URL: https://issues.apache.org/jira/browse/HBASE-22300 > Project: HBase > Issue Type: Improvement > Components: Balancer > Reporter: Biju Nair > Assignee: David Manning > Priority: Major > Labels: balancer > Attachments: CostFromRegionLoadFunctionNew.rtf > > > With increase in number of regions in a cluster the number of steps taken by > balancer in 30 sec (default balancer runtime) reduces noticeably. The > following is the number of steps taken with by balancer with region loads set > and running it without the loads being set i.e. cost functions using region > loads are not fully exercised. > {noformat} > Nodes regions Tables # of steps # of steps > with RS Load With no load > 5 50 5 200000 200000 > 100 2000 110 104707 1000000 > > 100 10000 40 19911 1000000 > > 200 100000 400 870 1000000 > {noformat} > As one would expect the reduced number of steps also makes the balancer take > long time to get to an optimal cost. Note that only 2 data points were used > in the region load histogram while in practice 15 region load data points are > remembered. -- This message was sent by Atlassian Jira (v8.3.4#803005)