[jira] [Created] (FLINK-2760) Avoid uploading of already existing jars from the JobClient

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-2760:
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             Summary: Avoid uploading of already existing jars from the JobClient
                 Key: FLINK-2760
                 URL: https://issues.apache.org/jira/browse/FLINK-2760
             Project: Flink
          Issue Type: Improvement
            Reporter: Till Rohrmann
            Priority: Minor


Currently, the {{JobClient}} uploads all user code jars to the {{JobManager}} upon triggering of the job execution. All jars are uploaded ignoring whether the jar already exists on the {{JobManager}} or not. This can be especially painful if one has many small jobs, which use the same big user code jars and which one wants to execute quickly one after the other.

In order to avoid unnecessary file transfers, I propose to check before uploading files whether they've already been transferred to the {{JobManager}} or not. Only in the latter case the file is uploaded then. This should improve the deployment speed of jobs depending on the same user code jars.



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