[
https://issues.apache.org/jira/browse/HIVE-4104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591946#comment-13591946
]
Hudson commented on HIVE-4104:
------------------------------
Integrated in Hive-trunk-h0.21 #1998 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/1998/])
HIVE-4104 : Hive localtask does not buffer disk-writes or reads (Gopal V
via Ashutosh Chauhan) (Revision 1452104)
Result = SUCCESS
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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