FileNotFoundException when finishing a profiled task that doesn't generate an
output file
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Key: HADOOP-5180
URL: https://issues.apache.org/jira/browse/HADOOP-5180
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Rodrigo Schmidt
Priority: Trivial
When running a hadoop job with mapred.task.profile=true, hadoop assumes that
mapred.task.profile.params contains a "%s" that can be changed for a file name
that will be created by the profiler containing its text output. If the
profiler doesn't generate such an output file, profiled tasks will raise a
FileNotFound exception at the end of their execution:
09/02/05 15:39:10 INFO mapred.JobClient: map 100% reduce 0%
09/02/05 15:39:10 INFO mapred.JobClient: Communication problem with server:
java.io.FileNotFoundException:
http://machine1:50060/tasklog?plaintext=true&taskid=attempt_200901221838_0043_m_000000_0&filter=profile
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1239)
at
org.apache.hadoop.mapred.JobClient.downloadProfile(JobClient.java:1089)
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1166)
at JavaCat.main(JavaCat.java:46)
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:165)
at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
This happens because it's assumed users will use the default hprof profiler,
which actually allows you to set the output file name. Not all profilers are
like that and some don't have any option to create a text output log at all or
don't allow you to change the name of the output file. In my case, I'm a
profiler that doesn't generate text output and only allows you to set the
output directory for the snapshot files it generates.
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