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https://issues.apache.org/jira/browse/HIVE-4104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591628#comment-13591628
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Ashutosh Chauhan commented on HIVE-4104:
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+1
Nice catch Gopal. Any guidance on size of buffer. Wondering higher value (8K?,
64K?) will result in higher saving.
> 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
> 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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