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https://issues.apache.org/jira/browse/HIVE-2372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214997#comment-13214997
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Edward Capriolo commented on HIVE-2372:
---------------------------------------
Lets get this committed. I think we should introduce the variables. In the
normal case we want someone to get all the input they would expect. If they run
into an exception they can turn the variable on to get out of the problem.
Lets do this. Rebase your patch and add
hive.scriptoperator.truncate.env=true|false to control this feature. Default it
to false which would be how hive works now. I will review and commit.
> java.io.IOException: error=7, Argument list too long
> ----------------------------------------------------
>
> Key: HIVE-2372
> URL: https://issues.apache.org/jira/browse/HIVE-2372
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Sergey Tryuber
> Priority: Critical
> Attachments: HIVE-2372.1.patch.txt
>
>
> I execute a huge query on a table with a lot of 2-level partitions. There is
> a perl reducer in my query. Maps worked ok, but every reducer fails with the
> following exception:
> 2011-08-11 04:58:29,865 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
> Executing [/usr/bin/perl, <reducer.pl>, <my_argument>]
> 2011-08-11 04:58:29,866 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
> tablename=null
> 2011-08-11 04:58:29,866 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
> partname=null
> 2011-08-11 04:58:29,866 INFO org.apache.hadoop.hive.ql.exec.ScriptOperator:
> alias=null
> 2011-08-11 04:58:29,935 FATAL ExecReducer:
> org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while
> processing row (tag=0)
> {"key":{"reducesinkkey0":129390185139228,"reducesinkkey1":"00008AF10000000063CA6F"},"value":{"_col0":"00008AF10000000063CA6F","_col1":"2011-07-27
>
> 22:48:52","_col2":129390185139228,"_col3":2006,"_col4":4100,"_col5":"10017388=6","_col6":1063,"_col7":"NULL","_col8":"address.com","_col9":"NULL","_col10":"NULL"},"alias":0}
> at
> org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:256)
> at
> org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:468)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
> at org.apache.hadoop.mapred.Child.main(Child.java:262)
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Cannot
> initialize ScriptOperator
> at
> org.apache.hadoop.hive.ql.exec.ScriptOperator.processOp(ScriptOperator.java:320)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:471)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:744)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:84)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:471)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:744)
> at
> org.apache.hadoop.hive.ql.exec.ExtractOperator.processOp(ExtractOperator.java:45)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:471)
> at
> org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:247)
> ... 7 more
> Caused by: java.io.IOException: Cannot run program "/usr/bin/perl":
> java.io.IOException: error=7, Argument list too long
> at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
> at
> org.apache.hadoop.hive.ql.exec.ScriptOperator.processOp(ScriptOperator.java:279)
> ... 15 more
> Caused by: java.io.IOException: java.io.IOException: error=7, Argument list
> too long
> at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
> at java.lang.ProcessImpl.start(ProcessImpl.java:65)
> at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
> ... 16 more
> It seems to me, I found the cause. ScriptOperator.java puts a lot of configs
> as environment variables to the child reduce process. One of variables is
> mapred.input.dir, which in my case more than 150KB. There are a huge amount
> of input directories in this variable. In short, the problem is that Linux
> (up to 2.6.23 kernel version) limits summary size of environment variables
> for child processes to 132KB. This problem could be solved by upgrading the
> kernel. But strings limitations still be 132KB per string in environment
> variable. So such huge variable doesn't work even on my home computer
> (2.6.32). You can read more information on
> (http://www.kernel.org/doc/man-pages/online/pages/man2/execve.2.html).
> For now all our work has been stopped because of this problem and I can't
> find the solution. The only solution, which seems to me more reasonable is to
> get rid of this variable in reducers.
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