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From Mike Walch <mwa...@apache.org>
Subject Re: debugging fluo
Date Tue, 01 Nov 2016 20:02:50 GMT
Were you able to find a worker_*.log file for each of your workers?

Below are some tips for debugging:

- Each YARN container should have a 'stdout' and 'stderr' file.  These
files may have helpful error messages.  Especially if a worker failed to
start.  Also, any calls to System.out and System.err in your observer will
be printed to these files.
- When running Fluo in YARN, Fluo must use Logback for logging (due to a
hard requirment by Twill). Logback is configured using
/path/to/fluo/conf/logback.xml.  You should review this configuration but
the root logger is configured by default to print any message that is the
debug level or higher.
- If you configured multiple workers, each worker will run in a different
container and have a different worker_*.log file.
- When a worker starts up, it prints its configuration to worker_*.log.
Make sure that you configured your observers using the property


On Tue, Nov 1, 2016 at 3:33 PM Meier, Caleb <Caleb.Meier@parsons.com> wrote:

> Do you have any tips for how to make Observers log to the log files found
> in the directory specified by 'yarn.nodemanager.log-dirs'?
> -----Original Message-----
> From: Mike Walch [mailto:mwalch@apache.org]
> Sent: Tuesday, November 01, 2016 2:36 PM
> To: dev@fluo.incubator.apache.org
> Subject: Re: debugging fluo
> Hi Caleb,
> The logs for a Fluo application can be found in YARN but they are tricky
> to find. Fluo should have better documentation on this which I will add now.
> The easiest way to view the logs for a Fluo application is to use the web
> interface for the YARN resource manager (
> https://urldefense.proofpoint.com/v2/url?u=http-3A__localhost-3A8088_cluster&d=CwIBaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=vuVdzYC2kksVZR5STiFwDpzJ7CrMHCgeo_4WXTD0qo8&m=S88pZ1xYAkVw1LehCcB3YDzFFeEKk6mq5Tns5Aewd2s&s=_4PS5z_vu1bkhpZBdzJXjbGsCvMBboMqoLBIOBnRAEY&e=
> ).
> First, click on the application ID (i.e application_*) of your Fluo
> application and then click on the latest attempt ID (appattempt_*). You
> should see a list of containers.  There should be a container for the
> application master (typically container 1), a Fluo oracle (typically
> container 2), and Fluo workers (containers 3+).  You can view the log files
> produced by a container by clicking on its 'logs' link.  Logs from Fluo
> observers will be in the worker_*.log file for each of your worker
> containers.
> If you don't want to use the YARN resource manager web interface, you can
> also view these logs in the directory specified by
> 'yarn.nodemanager.log-dirs' of your 'yarn-site.xml' config.  This method
> works well on one machine but on cluster your containers will probably be
> on different machines. See the YARN documentation below for more info about
> this property:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__hadoop.apache.org_docs_r2.7.0_hadoop-2Dyarn_hadoop-2Dyarn-2Dcommon_yarn-2Ddefault.xml&d=CwIBaQ&c=Nwf-pp4xtYRe0sCRVM8_LWH54joYF7EKmrYIdfxIq10&r=vuVdzYC2kksVZR5STiFwDpzJ7CrMHCgeo_4WXTD0qo8&m=S88pZ1xYAkVw1LehCcB3YDzFFeEKk6mq5Tns5Aewd2s&s=SS8YTOgIAWUmBnKkHN2Eu2-h6WyEHqlNvJO-D5EKFiI&e=
> Best,
> Mike
> On Tue, Nov 1, 2016 at 1:29 PM Meier, Caleb <Caleb.Meier@parsons.com>
> wrote:
> Hello,
> I'm attempting to debug a Fluo application and am having difficulty
> locating the logs for my observers.  I've looked within the logs for
> hadoop-yarn, but am not seeing any logging statements for my observers.
> Where do observers log out of the box in a normal cloudera distribution?
> Do I need to do something else in addition to logging to get my observers
> to generate logs?
> Thanks,
> Caleb

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