[jira] [Created] (FLINK-6247) Build a jar-with-dependencies for flink-table and put it into ./opt

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-6247:
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             Summary: Build a jar-with-dependencies for flink-table and put it into ./opt
                 Key: FLINK-6247
                 URL: https://issues.apache.org/jira/browse/FLINK-6247
             Project: Flink
          Issue Type: Improvement
          Components: Build System, Table API & SQL
    Affects Versions: 1.3.0
            Reporter: Fabian Hueske
            Assignee: sunjincheng


Due to a problem with Calcite and the unloading of classes, user-code classloaders that include Calcite cannot be garbage collected. This is a problem for long-running clusters that execute multiple Table API / SQL programs with fat JARs that include the flink-table dependency. Each executed program comes with an own user-code classloader that cannot be cleaned up later.

As a workaround, we recommend to copy the flink-table dependency into the ./lib folder. However, we do not have a jar file with all required transitive dependencies (Calcite, Janino, etc). Hence, users would need to build this jar file themselves or copy all jars into ./lib.

This issue is about creating a jar-with-dependencies and adding it to the ./opt folder. Users can then copy the jar file from ./opt to ./lib to include the table API in the classpath of Flink.



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