Bryan Beaudreault created HBASE-27241:
-----------------------------------------
Summary: Add metrics for evaluating cost and effectiveness of
bloom filters
Key: HBASE-27241
URL: https://issues.apache.org/jira/browse/HBASE-27241
Project: HBase
Issue Type: Improvement
Reporter: Bryan Beaudreault
Assignee: Bryan Beaudreault
Bloom filters can be costly for some tables, easily resulting in an aggregate
memory footprint of many GBs. It's currently hard to monitor for that cost on a
per-table basis. You can view {{staticBloomSize}} in JMX, but that is for the
whole server. Otherwise you must manually sum the values using the regionserver
UI. We can add this (as well as staticIndexSize) to the per-table metrics.
Additionally, it can be hard to know how effective those bloom filters are. I
think the easiest way to measure that is to count bloomFilterRequests and
bloomFilterNegativeResults. With these metrics in hand, one can have an easier
time deciding how much memory they want to give to their L1 cache and/or
whether they want to disable blooms on a table.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
