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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-4104) Hive localtask does not buffer disk-writes or reads
Date Fri, 01 Mar 2013 22:13:14 GMT
Gopal V created HIVE-4104:
-----------------------------

             Summary: 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


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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