[HBASE-27892] Report memstore on-heap and off-heap size as jmx metrics

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.6.0, 2.5.6, 3.0.0-beta-1
• Component/s: metrics
• Hadoop Flags: Reviewed
• Assignee: Jing Yu
• Reporter: Bryan Beaudreault
• Created: 25/May/23 21:28
• Updated: 28/Jun/23 05:41
• Resolved: 27/Jun/23 15:47

Description

Currently we only report "memStoreSize" metric in sub=RegionServer bean. I've noticed a big discrepancy between this metric and the RS UI's "Memstore On-Heap Size". It seems like "memStoreSize" is the overall data size, while the on-heap size is coming from our heap estimation which includes POJO heap overhead, etc.

I have a regionserver with only 750mb of "memStoreSize", but the on-heap size is over 1gb.  This is non-trivial for estimating overall heap size necessary for a regionserver. Since we have the data, let's report it.

Issue Links

• links to: GitHub Pull Request #5293
• links to: GitHub Pull Request #5308
• links to: GitHub Pull Request #5311