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Thomas Groh commented on BEAM-2583: ----------------------------------- Specifically, this only happens if, during a call to {{expand}}, the call throws an exception; that exception is caught or otherwise handled, and then the user attempts to continue to use the pipeline. This is very much a bug in the user's code, but it may fail in a non-intuitive sense (i.e. via NullPointerException) > Exceptions in expand() corrupt the TransformHierarchy > ----------------------------------------------------- > > Key: BEAM-2583 > URL: https://issues.apache.org/jira/browse/BEAM-2583 > Project: Beam > Issue Type: Bug > Components: sdk-java-core > Reporter: Kenneth Knowles > Priority: Minor > > Discovered recently during unrelated work that when a composite PTransform > (Java) crashes during expand - for example due to a validation failure - it > leaves the Pipeline in a state that throws NPEs when it is traversed. > No one has complained, so it doesn't seem critical to fix the mutation logic. > But we should set a bit and poison all future uses of the corrupted pipeline. -- This message was sent by Atlassian JIRA (v6.4.14#64029)