[jira] [Created] (MAPREDUCE-5965) Hadoop streaming throws error if list of input files is high. Error is: "error=7, Argument list too long at if number of input file is high"

["Arup Malakar (JIRA)" <ji...@apache.org>]

Arup Malakar created MAPREDUCE-5965:
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             Summary: Hadoop streaming throws error if list of input files is high. Error is: "error=7, Argument list too long at if number of input file is high"
                 Key: MAPREDUCE-5965
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5965
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Arup Malakar


Hadoop streaming exposes all the key values in job conf as environment variables when it forks a process for streaming code to run. Unfortunately the variable mapreduce_input_fileinputformat_inputdir contains the list of input files, and Linux has a limit on size of environment variables + arguments.
Based on how long the list of files and their full path is this could be pretty huge. And given all of these variables are not even used it stops user from running hadoop job with large number of files, even though it could be run.

Linux throws E2BIG if the size is greater than certain size which is error code 7. And java translates that to "error=7, Argument list too long". More: http://man7.org/linux/man-pages/man2/execve.2.html I suggest skipping variables if it is greater than certain length. That way if user code requires the environment variable it would fail. It should also introduce a config variable to skip long variables, and set it to false by default. That way user has to specifically set it to true to invoke this feature.

Here is the exception:
{code}
Error: java.lang.RuntimeException: Error in configuring object at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:426) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106) ... 9 more Caused by: java.lang.RuntimeException: Error in configuring object at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:38) ... 14 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106) ... 17 more Caused by: java.lang.RuntimeException: configuration exception at org.apache.hadoop.streaming.PipeMapRed.configure(PipeMapRed.java:222) at org.apache.hadoop.streaming.PipeMapper.configure(PipeMapper.java:66) ... 22 more Caused by: java.io.IOException: Cannot run program "/data/hadoop/hadoop-yarn/cache/yarn/nm-local-dir/usercache/oo-analytics/appcache/application_1403599726264_13177/container_1403599726264_13177_01_000006/./rbenv_runner.sh": error=7, Argument list too long at java.lang.ProcessBuilder.start(ProcessBuilder.java:1041) at org.apache.hadoop.streaming.PipeMapRed.configure(PipeMapRed.java:209) ... 23 more Caused by: java.io.IOException: error=7, Argument list too long at java.lang.UNIXProcess.forkAndExec(Native Method) at java.lang.UNIXProcess.<init>(UNIXProcess.java:135) at java.lang.ProcessImpl.start(ProcessImpl.java:130) at java.lang.ProcessBuilder.start(ProcessBuilder.java:1022) ... 24 more Container killed by the ApplicationMaster. Container killed on request. Exit code is 143 Container exited with a non-zero exit code 143
{code}

Hive does a similar trick: HIVE-2372 I have a patch for this, will soon submit a patch.



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