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From "Till Rohrmann (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-3441) Revisit quickstarts exclusion policy
Date Thu, 18 Feb 2016 13:11:18 GMT
Till Rohrmann created FLINK-3441:
------------------------------------

             Summary: Revisit quickstarts exclusion policy
                 Key: FLINK-3441
                 URL: https://issues.apache.org/jira/browse/FLINK-3441
             Project: Flink
          Issue Type: Improvement
          Components: Quickstarts
    Affects Versions: 1.0.0
            Reporter: Till Rohrmann
            Priority: Minor


Flink provides quickstart projects to quickly set up a Flink project. In order to decrease
the size of the resulting jar, the predefined {{pom.xml}} file contains a list of excluded
dependencies.

The problem with this approach is two-fold: First of all, the list seems to be rather arbitrary.
Why excluding {{org.apache.commons:commons-math}} but not {{org.apache.commons:commons-math3}}?
It seems as if this list would have to be kept up to date with every changing dependency of
Flink.

Secondly and the more severe problem is the following: The exclusions assume that Flink always
provides a compatible version for an excluded dependency. However, since the exclusions are
not bound to a specific version, this won't necessarily be true. For example, {{snappy-java}}
is excluded from the user job jar, because Flink with Hadoop {{2.3.0}} comes with {{snappy-java:1.0.5}}.
However, the {{kafka-clients:0.9.0}} which comes with the {{flink-connector-kafka-0.9}} dependency
has a transitive dependency on {{snappy-java:1.1.1.7}}. Consequently, this dependency will
be excluded from the user job jar per default. If version {{1.1.1.7}} is not compatible to
{{snappy-java:1.0.5}}, then the program will crash at runtime. This will be very hard to understand
for the user because it is a very subtle bug since the exclusions also affect the transitive
dependencies.



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