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From "Raymond Liu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8001) Avoid unnecessary lazy seek
Date Tue, 05 Mar 2013 08:30:30 GMT
Raymond Liu created HBASE-8001:
----------------------------------

             Summary: Avoid unnecessary lazy seek
                 Key: HBASE-8001
                 URL: https://issues.apache.org/jira/browse/HBASE-8001
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.94.5
            Reporter: Raymond Liu
            Assignee: Raymond Liu
             Fix For: 0.98.0


Lazy seek helps to reduce the real seek needed for multi hfile, when the kv from newer hfile
is enough to satisfy the query.

While in many case, it just push the real seek later, and do not reduce the number of real
seek. e.g. there are only one hfile, or storefilescanner is closed and only one left, or the
scan need to go through all the versions, all there are only one version of row and a sequence
scan is performed. In these case, lazy seek just bring extra overhead.


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