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From "Jonathan Lawlor (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13421) Reduce the number of object creations introduced by HBASE-11544 in scan RPC hot code paths
Date Tue, 07 Apr 2015 23:31:12 GMT
Jonathan Lawlor created HBASE-13421:
---------------------------------------

             Summary: Reduce the number of object creations introduced by HBASE-11544 in scan
RPC hot code paths
                 Key: HBASE-13421
                 URL: https://issues.apache.org/jira/browse/HBASE-13421
             Project: HBase
          Issue Type: Sub-task
            Reporter: Jonathan Lawlor
            Assignee: Jonathan Lawlor
             Fix For: 2.0.0, 1.1.0


HBASE-11544 made NextState the new return type of RegionScanner#nextRaw InternalScanner#next
to allow state information to be passed back from a scanner (it was formerly a boolean indicating
whether or not more values existed). The change in this return type led to an increased amount
of objects being created... In the case that a scan spanned millions of rows, there was the
potential for millions of object to be created.

This issue looks to reduce the large amount of object creations from potentially many to at
most one per RPC request. 

Please see the tail of the parent issue for relevant discussion on the design decisions related
to this solution. This sub-task has been filed as it seems more appropriate to address the
fix here rather than as an addendum to the parent.



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