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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13421) Reduce the number of object creations introduced by HBASE-11544 in scan RPC hot code paths
Date Wed, 08 Apr 2015 16:31:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485476#comment-14485476
] 

stack commented on HBASE-13421:
-------------------------------

I pushed to master (with checkstyle fixes to get us under limit again). Backport is a little
bit of work... [~jonathan.lawlor] You game?

> 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
>
>         Attachments: HBASE-13421-v1.patch, HBASE-13421-v2.patch
>
>
> 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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