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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-372) Nested UDFs cause _very_ high memory usage when processing query
Date Tue, 14 Apr 2009 01:36:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698611#action_12698611
] 

Namit Jain commented on HIVE-372:
---------------------------------

the .2 patch also failed for sort.q

    [junit] 09/04/13 18:10:01 ERROR exec.ExecDriver: Job Submission failed with exception
'java.io.IOExcep\
tion(Failed to get the current user's information.)'
    [junit] java.io.IOException: Failed to get the current user's information.
    [junit]   at org.apache.hadoop.mapred.JobClient.getUGI(JobClient.java:717)
    [junit]   at org.apache.hadoop.mapred.JobClient.configureCommandLineOptions(JobClient.java:592)
    [junit]   at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:774)
    [junit]   at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:393)
    [junit]   at org.apache.hadoop.hive.ql.exec.ExecDriver.main(ExecDriver.java:556)
    [junit]   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit]   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    [junit]   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    [junit]   at java.lang.reflect.Method.invoke(Method.java:597)
    [junit]   at org.apache.hadoop.util.RunJar.main(RunJar.java:165)
    [junit]   at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
    [junit]   at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    [junit]   at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
    [junit]   at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
    [junit] Caused by: javax.security.auth.login.LoginException: Login failed: whoami: cannot
find usernam\
e for UID 1688



I dont think this has anything to do with your patch, but will run the tests again and see


> Nested UDFs cause _very_ high memory usage when processing query
> ----------------------------------------------------------------
>
>                 Key: HIVE-372
>                 URL: https://issues.apache.org/jira/browse/HIVE-372
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>         Environment: Fedora Linux, 10x Amazon EC2 (Large Instance w/ 8GB Ram)
>            Reporter: Steve Corona
>         Attachments: HIVE-372.1.patch, HIVE-372.2.patch
>
>
> When nesting UDFs, the Hive Query processor takes a large amount of time+memory to process
the query. For example, I ran something along the lines of:
> select trim( trim( trim(trim( trim( trim( trim( trim( trim(column))))))))) from test_table;
> This query needs 10GB+ of memory to process before it'll launch the job. The amount of
memory increases exponentially with each nested UDF.
> Obviously, I am using trim() in this case as a simple example that causes the same problem
to occur. In my actual use-case I had a bunch of nested regexp_replaces.

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