[AMBARI-24256] Ambari Grafana HBase metrics wrong - readRequestCount > totalRequestCount!

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.5.2
• Component/s: ambari-metrics

Environment

HDP 2.6

• Assignee: Unassigned
• Reporter: Hari Sekhon
• Created: 06/Jul/18 14:36
• Updated: 16/Jul/18 15:41

Description

Ambari Grafana metrics appear to have another bug in HBase - Home -> Num Requests - Total.

writeRequestCount and totalRequestCount are about the same but readRequestCount is consistently triple that of totalRequestCount which cannot possibly be true...

totalRequestCount should == writeRequestCount + readRequestCount, but this is not the case.

It looks like this may be due to multi requests being counted only once, see HBASE-18469.

This is not at all intuitive, it would have been better to have made totalRequestCount == writeRequestCount + readRequestCount and made a new metric to count multi requests as a single request.

Issue Links

• relates to: HBASE-18469 Correct RegionServer metric of totalRequestCount
• relates to: HBASE-20626 Change the value of "Requests Per Second" on WEBUI