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Hadoop, mail # user - out of memory running examples


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RE: out of memory running examples
Tim Broberg 2012-02-07, 17:39
Everything is box-stock default, and I am running in local mode attempting to follow the documentation verbatim.

No luck on setting io.sort.mb down to 10.

    - Tim.

[tbroberg@san-mothra hadoop-1.0.0]$ cat conf/core-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
  <property>
     <name>io.sort.mb</name>
     <value>10</value>
  </property>
</configuration>
[tbroberg@san-mothra hadoop-1.0.0]$
________________________________________
From: Harsh J [[EMAIL PROTECTED]]
Sent: Tuesday, February 07, 2012 4:45 AM
To: [EMAIL PROTECTED]
Subject: Re: out of memory running examples

What is your io.sort.mb set to? Given the heap size, you may have to
lower it down.

And did you intend to run the program in 'local' mode (i.e.
non-distributed mode, no JobTracker but LocalJobRunner)?

On Tue, Feb 7, 2012 at 3:20 PM, Tim Broberg <[EMAIL PROTECTED]> wrote:
> 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
Harsh J
Customer Ops. Engineer
Cloudera | http://tiny.cloudera.com/about

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