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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4434) Don't do HFile Scanner next() unless the next KV is needed:
Date Mon, 19 Sep 2011 07:44:09 GMT
Don't do HFile Scanner next() unless the next KV is needed:
-----------------------------------------------------------

                 Key: HBASE-4434
                 URL: https://issues.apache.org/jira/browse/HBASE-4434
             Project: HBase
          Issue Type: Bug
            Reporter: Kannan Muthukkaruppan
            Assignee: Kannan Muthukkaruppan


When a seek/reseek is done on StoreFileScanner, in addition to setting the current KV, it
also does a HFileScanner level next() ahead of time even if the next KV is never actually
required. This inefficiency can potentially result in additional disk seeks and sub-optimal
use of the block cache (primarily for cases where the KVs are large and each occupies an HFile
block of its own).




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