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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2451) .META. by-passes cache; BLOCKCACHE=>'false'
Date Thu, 15 Apr 2010 23:24:49 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-2451:
-------------------------

    Attachment: meta3.txt

Patch that enables IN_MEMORY and BLOCKCACHE on catalog tables on bootstrap.  Includes script
that will fixup catalog tables when run (though subsequently requires cluster restart or redeploy
of the .META. for the change to take effect).

> .META. by-passes cache; BLOCKCACHE=>'false'
> -------------------------------------------
>
>                 Key: HBASE-2451
>                 URL: https://issues.apache.org/jira/browse/HBASE-2451
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>            Priority: Blocker
>             Fix For: 0.20.4, 0.20.5, 0.21.0
>
>         Attachments: meta.txt, meta3.txt
>
>
> In a new install, if I describe '.META.', it says:
> {code}
> DESCRIPTION                                                             ENABLED     
                         
>  {NAME => '.META.', IS_META => 'true', MEMSTORE_FLUSHSIZE => '16384', F true
                                 
>  AMILIES => [{NAME => 'historian', COMPRESSION => 'NONE', VERSIONS => ' 
                                     
>  2147483647', TTL => '604800', BLOCKSIZE => '8192', IN_MEMORY => 'false    
                                  
>  ', BLOCKCACHE => 'false'}, {NAME => 'info', COMPRESSION => 'NONE', VER    
                                  
>  SIONS => '10', TTL => '2147483647', BLOCKSIZE => '8192', IN_MEMORY =>  
                                     
>  'false', BLOCKCACHE => 'true'}]} 
> {code}
> BLOCKCACHE is 'true' for the 'info' family (Yes historian is still in 0.20 branch).
> But, if I add logging to hfile and storefile and store, blockcache is 'false' -- there
is no cache constructed for use by the hfile.
> This is killing cluster performance.  
> It looks like a problem parsing the 'true' value in columnfamily.  I'll put up a patch
in the morning.  Meantime, marking as blocker on 0.20.4.

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