[
https://issues.apache.org/jira/browse/HIVE-2350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089329#comment-13089329
]
Hudson commented on HIVE-2350:
------------------------------
Integrated in Hive-trunk-h0.21 #909 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/909/])
HIVE-2350. Improve RCFile Read Speed (Tim Armstrong via cws)
cws : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1160525
Files :
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/io/RCFile.java
> Improve RCFile Read Speed
> -------------------------
>
> Key: HIVE-2350
> URL: https://issues.apache.org/jira/browse/HIVE-2350
> Project: Hive
> Issue Type: Improvement
> Components: Serializers/Deserializers
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Minor
> Labels: rcfile
> Fix For: 0.8.0
>
> Attachments: rcfile-2011-08-04.diff, rcfile_opt_2011-08-05.diff,
> rcfile_opt_2011-08-05b.diff, rcfile_opt_2011-08-11.patch,
> rcfile_opt_2011-08-11.patch
>
> Original Estimate: 0h
> Remaining Estimate: 0h
>
> By tweaking the RCFile$Reader implementation to allow more efficient memory
> access I was able to reduce CPU usage. I measured the speed required to scan
> a gzipped RCFile, decompress and assemble into records. CPU time was reduced
> by about 7% for a full table scan, An improvement of about 2% was realised
> when a smaller subset of columns (3-5 out of tens) were selected.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
