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Posted to dev@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2008/10/13 18:40:44 UTC
[jira] Work started: (HBASE-920) Make region balancing sloppier
[ https://issues.apache.org/jira/browse/HBASE-920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HBASE-920 started by Andrew Purtell.
> Make region balancing sloppier
> ------------------------------
>
> Key: HBASE-920
> URL: https://issues.apache.org/jira/browse/HBASE-920
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: stack
> Assignee: Andrew Purtell
>
> The region load balancer is exacting. Here's the logic:
> {code}
> if (avgLoad > 2.0 && thisServersLoad.getNumberOfRegions() > avgLoad) {
> if (LOG.isDebugEnabled()) {
> LOG.debug("Server " + serverName + " is overloaded. Server load: " +
> thisServersLoad.getNumberOfRegions() + " avg: " + avgLoad);
> }
> ...
> {code}
> On a cluster of thousands of regions, especially around startup or if there's been a crash, the above makes for a bunch of churn as load balancer closes and opens nodes to achieve an exact balance (all nodes must be <= to average).
> I'd suggest that nodes should be left alone if they are within some percentage of the average -- say 10% (should be configurable).
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