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Kenneth Knowles updated BEAM-1314: ---------------------------------- Issue Type: Wish (was: Improvement) > DoFn per-key lifecycle (Setup/Teardown) > --------------------------------------- > > Key: BEAM-1314 > URL: https://issues.apache.org/jira/browse/BEAM-1314 > Project: Beam > Issue Type: Wish > Components: beam-model > Reporter: Eugene Kirpichov > > DoFn's that use state and timers are implicitly per-key. Setup/Teardown > methods are usually used to establish expensive resources - long-standing > connections and such. > For per-key DoFn's, we'd often want to use these per-key, so it'd be good to > have ability in the model to ask that there be 1 instance of the DoFn per > key, reused between e.g. different timer or trigger firings for this key, but > not used for other keys. > E.g. this would be particularly useful for Splittable DoFn - for its ability > to reuse expensive resources between checkpoints. -- This message was sent by Atlassian JIRA (v6.3.15#6346)