[HBASE-20233] [metrics] Ill-formatted numRegions metric in "Hadoop:service=HBase,name=RegionServer,sub=Regions" mbean

• Type: Bug
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: metrics, Operability
• Labels: beginner
• Tags: beginner
• Assignee: Xu Cang
• Reporter: Michael Stack
• Created: 20/Mar/18 20:04
• Updated: 08/Apr/23 04:27
• Resolved: 14/Apr/18 15:31

Description

Noticed this poking at metrics. The MBean "Hadoop:service=HBase,name=RegionServer,sub=Regions" carries per region metrics. They are all formatted like so:

Namespace_default_table_IntegrationTestBigLinkedList_metric_incrementTime_98th_percentile: 0,
Namespace_default_table_IntegrationTestBigLinkedList_metric_incrementTime_99th_percentile: 0,
Namespace_default_table_IntegrationTestBigLinkedList_metric_incrementTime_99.9th_percentile: 0,
Namespace_default_table_IntegrationTestBigLinkedList_metric_appendTime_num_ops: 0,
Namespace_default_table_IntegrationTestBigLinkedList_metric_appendTime_min: 0,
Namespace_default_table_IntegrationTestBigLinkedList_metric_appendTime_max: 0,
Namespace_default_table_IntegrationTestBigLinkedList_metric_appendTime_mean: 0,

In the middle of them all is a metric named...

numRegions: 15,

It has a different format and it is out of scope when compared to the other metrics in this mbean; it belongs better elsewhere, perhaps in the Server bean.

I noticed it because it breaks the parse done by tcollector scraping our metrics from /jmx

It was added long ago in HBASE-14166

Issue Links

• relates to: HBASE-27713 Remove numRegions in Region Metrics