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From "Doug Meil (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4089) blockCache contents report
Date Fri, 29 Jul 2011 11:18:09 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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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