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https://issues.apache.org/jira/browse/HBASE-18568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16181797#comment-16181797
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huaxiang sun commented on HBASE-18568:
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[~zhangshibin], this is a very good catch!
> Correct metric of numRegions
> ------------------------------
>
> Key: HBASE-18568
> URL: https://issues.apache.org/jira/browse/HBASE-18568
> Project: HBase
> Issue Type: Bug
> Components: metrics
> Affects Versions: 3.0.0
> Reporter: Shibin Zhang
> Assignee: Shibin Zhang
> Priority: Critical
> Fix For: 3.0.0, 1.4.0, 1.5.0, 2.0.0-alpha-3
>
> Attachments: HBASE-18568-V1.patch
>
>
> i found the value of metric numReigons in Regions is not correct.
> the metric can not add or remove region correctly as region close or open.
> the metric as follow:
> "name" : "Hadoop:service=HBase,name=RegionServer,sub=Regions",
> "numRegions" : 2,
> after trouble shooting ,i found the reason is in
> MetricsRegionSourceImpl#MetricsRegionSourceImpl
> {code:java}
> agg.register(this);
> ...
> hashCode = regionWrapper.getRegionHashCode();
> {code}
> when add the MetricsRegionSource to set ,but the hashCode has not yet
> initialized.
> So, the setFromMap can not put or remove the object correctly.
> it will be better like this :
> {code:java}
> hashCode = regionWrapper.getRegionHashCode();
> agg.register(this);
> {code}
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