[ https://issues.apache.org/jira/browse/HBASE-14215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ted Yu updated HBASE-14215: --------------------------- Status: Patch Available (was: Open) > Default cost used for PrimaryRegionCountSkewCostFunction is not sufficient > --------------------------------------------------------------------------- > > Key: HBASE-14215 > URL: https://issues.apache.org/jira/browse/HBASE-14215 > Project: HBase > Issue Type: Bug > Components: Balancer > Reporter: Biju Nair > Priority: Minor > Attachments: 14215-v1.txt > > > Current multiplier of 500 used in the stochastic balancer cost function > ``PrimaryRegionCountSkewCostFunction`` to calculate the cost of total > primary replication skew doesn't seem to be sufficient to prevent the skews > (Refer HBASE-14110). We would want the default cost to be a higher value so > that skews in primary region replica has higher cost. The following is the > test result by setting the multiplier value to 10000 (same as the region > replica rack cost multiplier) on a 3 Rack 9 RS node cluster which seems to > get the balancer distribute the primaries uniformly. > *Initial Primary replica distribution - using the current multiplier* > r1n10 102 > r1n11 85 > r1n9 88 > r2n10 120 > r2n11 120 > r2n9 124 > r3n10 135 > r3n11 124 > r3n9 129 > *After long duration of read & writes - using current multiplier* > r1n10 102 > r1n11 85 > r1n9 88 > r2n10 120 > r2n11 120 > r2n9 124 > r3n10 135 > r3n11 124 > r3n9 129 > *After manual balancing* > r1n10 102 > r1n11 85 > r1n9 88 > r2n10 120 > r2n11 120 > r2n9 124 > r3n10 135 > r3n11 124 > r3n9 129 > *Increased multiplier for primaryRegionCountSkewCost to 10000* > r1n10 114 > r1n11 113 > r1n9 114 > r2n10 114 > r2n11 114 > r2n9 113 > r3n10 115 > r3n11 115 > r3n9 115 > Setting the `PrimaryRegionCountSkewCostFunction` multiplier value to 10000 > should help HBase general use. -- This message was sent by Atlassian JIRA (v6.3.4#6332)