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Kenneth Knowles commented on BEAM-1316: --------------------------------------- I suggest very explicitly distinguishing flushing to external systems from flushing output to a PCollection. FinishBundle works for the former but for the latter requires significant contortions to be correct and even then won't do what you want when there are many small bundles. > DoFn#startBundle and #finishBundle should not be able to output > --------------------------------------------------------------- > > Key: BEAM-1316 > URL: https://issues.apache.org/jira/browse/BEAM-1316 > Project: Beam > Issue Type: Bug > Components: sdk-java-core > Reporter: Thomas Groh > > While within startBundle and finishBundle, the window in which elements are > output is not generally defined. Elements must always be output from within a > windowed context, or the {{WindowFn}} used by the {{PCollection}} may not > operate appropriately. > startBundle and finishBundle are suitable for operational duties, similarly > to {{setup}} and {{teardown}}, but within the scope of some collection of > input elements. This includes actions such as clearing field state within a > DoFn and ensuring all live RPCs complete successfully before committing > inputs. -- This message was sent by Atlassian JIRA (v6.3.4#6332)