What is the Java heap space you configured?
for the property mapred.child.java.opts
________________________________________
From: Tim Broberg [tim.brob...@exar.com]
Sent: Tuesday, February 07, 2012 3:20 PM
To: common-user@hadoop.apache.org
Subject: out of memory running examples
I'm trying to run the basic example from
hadoop/hadoop-1.0.0/docs/single_node_setup.html.
I'm getting java.lang.OutOfMemoryError's when I run the grep example from that
page.
Stackoverflow suggests various tweaks to the command line, mapred-site.xml, or
hadoop-env.sh, none of which seem to be helping in my case.
When I tweak hadoop-env.sh to echo text to a file, that file doesn't show up,
which suggests that hadoop-env.sh isn't even getting executed.
Any hints on debugging this?
- Tim.
[tbroberg@san-mothra hadoop-1.0.0]$ bin/hadoop jar hadoop-examples-1.0.0.jar
grep input output 'dfs[a-z.]+'
Warning: $HADOOP_HOME is deprecated.
12/02/07 01:39:35 INFO util.NativeCodeLoader: Loaded the native-hadoop library
12/02/07 01:39:35 INFO mapred.FileInputFormat: Total input paths to process : 7
12/02/07 01:39:35 INFO mapred.JobClient: Running job: job_local_0001
12/02/07 01:39:35 INFO util.ProcessTree: setsid exited with exit code 0
12/02/07 01:39:35 INFO mapred.Task: Using ResourceCalculatorPlugin :
org.apache.hadoop.util.LinuxResourceCalculatorPlugin@4c349471<mailto:org.apache.hadoop.util.LinuxResourceCalculatorPlugin@4c349471>
12/02/07 01:39:35 INFO mapred.MapTask: numReduceTasks: 1
12/02/07 01:39:35 INFO mapred.MapTask: io.sort.mb = 100
12/02/07 01:39:35 WARN mapred.LocalJobRunner: job_local_0001
java.lang.OutOfMemoryError: Java heap space
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:949)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:428)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)
12/02/07 01:39:36 INFO mapred.JobClient: map 0% reduce 0%
12/02/07 01:39:36 INFO mapred.JobClient: Job complete: job_local_0001
12/02/07 01:39:36 INFO mapred.JobClient: Counters: 0
12/02/07 01:39:36 INFO mapred.JobClient: Job Failed: NA
java.io.IOException: Job failed!
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1265)
at org.apache.hadoop.examples.Grep.run(Grep.java:69)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.examples.Grep.main(Grep.java:93)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
[tbroberg@san-mothra hadoop-1.0.0]$
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