Shibin Zhang created HBASE-18568:
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Summary: Correct Regions 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
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 put or remove the object correctly.
it will be better to move
{code:java}
hashCode = regionWrapper.getRegionHashCode();
{code}
above
{code:java}
agg.register(this);
{code}
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