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From "Luis Ramos (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2372) java.io.IOException: error=7, Argument list too long
Date Tue, 20 Dec 2011 22:13:30 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13173554#comment-13173554
] 

Luis Ramos commented on HIVE-2372:
----------------------------------

We are running into the same problem here, my list of input files is even larger. In my case
we are using a TRANSFORM() python script to convert the output of the reducers to csv format.
I confirmed that lowering the number of input files works by specifying a limited partition
or merging the inputs. Either way, I don't think it should pass that entire list through environment
variables. I can go with an option to remove that.
                
> 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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