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https://issues.apache.org/jira/browse/HIVE-2372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13194602#comment-13194602
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Sergey Tryuber commented on HIVE-2372:
--------------------------------------
Well, guys, give me a week to prepare a patch (just have no time right now)
that will truncate this variable to 20KB if string length is too large (I'm
going to hardcode this value) and prints WARN to log if such thing happend.
> 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
>
> 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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