Kenneth Knowles created BEAM-6573:
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             Summary: Should MetricsContainer actually be Serializable?
                 Key: BEAM-6573
                 URL: https://issues.apache.org/jira/browse/BEAM-6573
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-core
            Reporter: Kenneth Knowles


Interface MetricsContainer extends Serializable but does not explain why. While 
it does seem like an interface where some implementations will be serialized 
and shipped, it does not seem like an inherent property of a MetricsContainer. 
In particular, Dataflow worker has some implementations that are _not_ 
serializable, and findbugs noticed.



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