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Posted to dev@hive.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2013/04/05 01:40:31 UTC
[jira] [Commented] (HIVE-4104) Hive localtask does not buffer
disk-writes or reads
[ https://issues.apache.org/jira/browse/HIVE-4104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13623005#comment-13623005 ]
Hudson commented on HIVE-4104:
------------------------------
Integrated in Hive-trunk-hadoop2 #138 (See [https://builds.apache.org/job/Hive-trunk-hadoop2/138/])
HIVE-4104 : Hive localtask does not buffer disk-writes or reads (Gopal V via Ashutosh Chauhan) (Revision 1452104)
Result = FAILURE
hashutosh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1452104
Files :
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/HashMapWrapper.java
> Hive localtask does not buffer disk-writes or reads
> ---------------------------------------------------
>
> Key: HIVE-4104
> URL: https://issues.apache.org/jira/browse/HIVE-4104
> Project: Hive
> Issue Type: Bug
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Minor
> Fix For: 0.11.0
>
> Attachments: HIVE-4104.patch
>
>
> Hive's HashMapWrapper does not use any buffering in its File I/O, but operates sequentially for writes & reads.
> The strace logs show clearly that
> {code}
> 9495 write(222, "x", 1) = 1
> 9495 write(222, "sq\0~\0\5", 6) = 6
> 9495 write(222, "w\25", 2) = 2
> 9495 write(222, "\0\0\0\1\0\0\0\1\0\0\0\2\0\0\0\5\3\1M\1S", 21) = 21
> 9495 write(222, "x", 1) = 1
> 9495 write(222, "sq\0~\0\2", 6) = 6
> 9495 write(222, "w\t", 2) = 2
> 9495 write(222, "\0\0\0\5\1\215\r\325v", 9) = 9
> {code}
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