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POJava Child Error in Hadoop TaskRunner
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Id
10596432
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11033509
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2012-05-15T07:56:40.897
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2013-07-01T12:56:50.463
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2012-05-15T13:19:54.147
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text
Body
I'm trying to run the Hadoop grep example in a pseudo-distributed configuration using Hadoop 0.22.0 on Windows 7 with Cygwin. The example works fine in standalone mode, but when run in pseudo-distributed mode it gives the following output <pre><code>$ bin/hadoop jar hadoop-mapred-examples-0.22.0.jar grep input output 'dfs[a-z.]+' 12/05/15 08:27:31 WARN conf.Configuration: mapred.used.genericoptionsparser is deprecated. Instead, use mapreduce.client.genericoptionsparser.used 12/05/15 08:27:31 WARN mapreduce.JobSubmitter: No job jar file set. User classes may not be found. See Job or Job#setJar(String). 12/05/15 08:27:31 INFO input.FileInputFormat: Total input paths to process : 1 12/05/15 08:27:32 INFO mapreduce.JobSubmitter: number of splits:1 12/05/15 08:27:33 INFO mapreduce.Job: Running job: job_201205150826_0001 12/05/15 08:27:34 INFO mapreduce.Job: map 0% reduce 0% 12/05/15 08:27:47 INFO mapreduce.Job: Task Id : attempt_201205150826_0001_m_000002_0, Status : FAILED java.lang.Throwable: Child Error at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:225) Caused by: java.io.IOException: Task process exit with nonzero status of 1. at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:212) 12/05/15 08:27:47 WARN mapreduce.Job: Error reading task outputhttp://xxx.xxx.xxx:50060/tasklog?plaintext=true&attemptid=attempt_201205150826_0001_m_000002_0&filter=stdout </code></pre> Does anyone know what could be causing the Java Child Error, or the warning about the task output cannot be read? I get the following error in the TaskTracker log: <pre><code>Failed to retrieve stdout log for task: attempt_201205151356_0001_m_000002_0 java.io.FileNotFoundException: C:\cygwin\usr\local\hadoop-0.22.0\logs\userlog\job_201205151356_0001\attempt_201205151356_0001_m_000002_0\log.index (The system cannot find the file specified) </code></pre>
Tags
<hadoop><cygwin>
Title
Java Child Error in Hadoop TaskRunner
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