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https://issues.apache.org/jira/browse/HBASE-6298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405143#comment-13405143
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Zhihong Ted Yu edited comment on HBASE-6298 at 7/2/12 5:25 PM:
---------------------------------------------------------------
This issue should be asked on dev mailing list first.
There is a sloppy factor used by load balancer (defaulting to 20%):
{code}
public void setConf(Configuration conf) {
this.slop = conf.getFloat("hbase.regions.slop", (float) 0.2);
{code}
The log message cited above came from this check:
{code}
int floor = (int) Math.floor(average * (1 - slop));
int ceiling = (int) Math.ceil(average * (1 + slop));
if (serversByLoad.lastKey().getLoad() <= ceiling &&
serversByLoad.firstKey().getLoad() >= floor) {
{code}
The average number of regions is 37 for Dave's cluster.
(44-37)/37=19%
@Dave:
I suggest you tighten "hbase.regions.slop"
was (Author: zhi...@ebaysf.com):
This issue should be asked on dev mailing list first.
There is a sloppy factor used by load balancer (defaulting to 20%):
{code}
public void setConf(Configuration conf) {
this.slop = conf.getFloat("hbase.regions.slop", (float) 0.2);
{code}
The average number of regions is 37 for Dave's cluster.
(44-37)/37=19%
@Dave:
I suggest you tighten "hbase.regions.slop"
> Region balancer not balancing
> -----------------------------
>
> Key: HBASE-6298
> URL: https://issues.apache.org/jira/browse/HBASE-6298
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.94.0
> Reporter: Dave Revell
> Attachments: master_startup.log
>
>
> Despite regions being unbalanced, the load balancer takes no action. On my
> cluster the least-loaded regionserver has 33 regions and the most-loaded
> regionserver has 44 regions. My cluster has 1084 regions and 29 servers. It
> might be relevant that a 30th server used to belong to the cluster but was
> removed.
> The master log has some strange entries when the balancer runs. The attached
> log file was generated by restarting the master, then running "balancer" in
> the shell.
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