map Reduce Job Log files?

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This topic contains 2 replies, has 2 voices, and was last updated by  Dan Marshall 1 year, 4 months ago.

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  • #49478

    Dan Marshall

    I am writing to stdout in my Java program, but I cannot locate the output. I use the Sandbox web interface to find something for the application ID, but it is in a binary, unreadable format.

    Am I in the right place?

    My jobs (under yarn) are running fine, but i want to do some simple debugging by logging readable messages someplace – any advice appreciated.

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  • #49770

    Dan Marshall

    That is not running on my sandbox.

    Should I expect that to be up and running on a standard sandbox install – or do I need to configure something?

    This might be related – I enabled Ambari, but that doesn’t seem to running either.




    Hi Dan,
    You can access these logs and the stdout debugging at the url for the jobhistory server , It should be if using the sandbox. Once there, you can click on the job and then explore the logs for either the mappers or the reducers. In the log, there are sections for stderr, stdout, and syslog. Your statements should appear in the stdout section. I hope this helps.


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