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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2451) .META. by-passes cache; BLOCKCACHE=>'false'
Date Thu, 15 Apr 2010 04:49:49 GMT
.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


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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