You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@tez.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2014/10/22 06:41:33 UTC
[jira] [Updated] (TEZ-1593) Refactor PipelinedSorter to remove all
MMAP based ByteBuffer references
[ https://issues.apache.org/jira/browse/TEZ-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gopal V updated TEZ-1593:
-------------------------
Summary: Refactor PipelinedSorter to remove all MMAP based ByteBuffer references (was: PipelinedSorter::compare() makes a key-copy to satisfy RawComparator interface)
> Refactor PipelinedSorter to remove all MMAP based ByteBuffer references
> -----------------------------------------------------------------------
>
> Key: TEZ-1593
> URL: https://issues.apache.org/jira/browse/TEZ-1593
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.6.0
> Reporter: Gopal V
> Assignee: Gopal V
> Labels: Performance
>
> The current implementation of PipelinedSorter has a slow section which revolves around key comparisons.
> {code}
> kvbuffer.position(istart);
> kvbuffer.get(ki, 0, ilen);
> kvbuffer.position(jstart);
> kvbuffer.get(kj, 0, jlen);
> // sort by key
> final int cmp = comparator.compare(ki, 0, ilen, kj, 0, jlen);
> {code}
> The kvbuffer.get into the arrays ki and kj are the slowest part of the comparator operation.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)