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https://issues.apache.org/jira/browse/HBASE-4089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Meil updated HBASE-4089:
-----------------------------
Description:
Summarized 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. But I think it would be helpful
from an operational perspective.
Updated (7-29): Removing suggestion for UI. I would be happy just to get this
report on a configured interval dumped to a log file.
was:
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.
> blockCache contents report
> --------------------------
>
> Key: HBASE-4089
> URL: https://issues.apache.org/jira/browse/HBASE-4089
> Project: HBase
> Issue Type: New Feature
> Reporter: Doug Meil
>
> Summarized 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. But I think it would be
> helpful from an operational perspective.
> Updated (7-29): Removing suggestion for UI. I would be happy just to get
> this report on a configured interval dumped to a log file.
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