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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10447) Memstore flusher scans storefiles also when the scanner heap gets reset
Date Fri, 31 Jan 2014 09:22:08 GMT
ramkrishna.s.vasudevan created HBASE-10447:
----------------------------------------------

             Summary: Memstore flusher scans storefiles also when the scanner heap gets reset
                 Key: HBASE-10447
                 URL: https://issues.apache.org/jira/browse/HBASE-10447
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.96.1.1, 0.98.0, 0.99.0
            Reporter: ramkrishna.s.vasudevan
            Assignee: ramkrishna.s.vasudevan


See the mail thread
http://osdir.com/ml/general/2014-01/msg61294.html

In case of flush we create a memstore flusher which in turn creates a  StoreScanner backed
by a Single ton MemstoreScanner.  

But this scanner also registers for any updates in the reader in the HStore.  Is this needed?
 
If this happens then any update on the reader may nullify the current heap and the entire
Scanner Stack is reset, but this time with the other scanners for all the files that satisfies
the last top key.  So the flush that happens on the memstore holds the storefile scanners
also in the heap that was recreated but originally the intention was to create a scanner on
the memstore alone.



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