UI for blockCache contents report
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Key: HBASE-4089
URL: https://issues.apache.org/jira/browse/HBASE-4089
Project: HBase
Issue Type: New Feature
Reporter: Doug Meil
A UI that would display a block-cache report for a RegionServer would be
helpful. For example ...
table1
cf1 100 blocks, totalBytes=yyyyy, averageTimeInCache=XXXX hours
cf2 200 blocks, totalBytes=zzzzz, averageTimeInCache=XXXX hours
table2
cf1 75 blocks, totalBytes=yyyyy, averageTimeInCache=XXXX hours
cf2 150 blocks, totalBytes=zzzzz, averageTimeInCache=XXXX hours
... Etc.
The current metrics list blockCacheSize and blockCacheFree, but there is no way
to know what's in there. Any single block isn't really important, but the
patterns of what CF/Table they came from, how big are they, and how long (on
average) they've been in the cache, are important.
No such interface exists in HRegionInterface, so this is not just a UI request
also an API change. But I think it would be helpful from an operational
perspective.
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