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From "Robert Metzger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2037) Unable to start Python API using ./bin/pyflink*.sh
Date Mon, 18 May 2015 14:23:59 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14548064#comment-14548064
] 

Robert Metzger commented on FLINK-2037:
---------------------------------------

I'm not sure how to resolve this issue.
The problem is that the python code assumed that there is a flink-python.jar in the {{lib/}}
folder.

Since we're packaging everything in one fat-jar, this assumption is not true. However the
code required by the Python API is contained in the fat jar (called {{flink-dist.jar}}.
The easiest workaround for the issue is to submit the fat jar itself to the job client. But
I don't think this is a feasible solution because the system should have loaded all the classes
already ;)

I see the following approaches to resolve the issue:
* Create a flink-python.jar in {{lib/}} which contains the python stuff.
* Allow the CliFrontend to run without a valid jar file (i suspect this breaks a lot of code
and reduces usability because we can not hint a user that the jar file is missing anymore).
* We do not submit Python jobs to a cluster using the client.

For now, I'll see whether the first option is easily doable.

> Unable to start Python API using ./bin/pyflink*.sh
> --------------------------------------------------
>
>                 Key: FLINK-2037
>                 URL: https://issues.apache.org/jira/browse/FLINK-2037
>             Project: Flink
>          Issue Type: Bug
>          Components: Python API
>    Affects Versions: 0.9
>            Reporter: Robert Metzger
>            Assignee: Robert Metzger
>            Priority: Critical
>
> Calling {{./bin/pyflink3.sh}} will lead to
> {code}
> ./bin/pyflink3.sh
> log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
> log4j:WARN Please initialize the log4j system properly.
> log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
> JAR file does not exist: /home/robert/incubator-flink/build-target/bin/../lib/flink-python-0.9-SNAPSHOT.jar
> Use the help option (-h or --help) to get help on the command.
> {code}
> This is due to the script expecting a {{flink-python-0.9-SNAPSHOT.jar}} file to exist
in {{lib}} (its wrong anyways that the version name is included here. That should be replaced
by a {{*}}).
> I'll look into the issue ...



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