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ASF GitHub Bot logged work on BEAM-8157: ---------------------------------------- Author: ASF GitHub Bot Created on: 10/Nov/19 11:11 Start Date: 10/Nov/19 11:11 Worklog Time Spent: 10m Work Description: mxm commented on pull request #9997: [BEAM-8157] Fix key encoding issues for state requests with unknown coders / Improve debugging and testing URL: https://github.com/apache/beam/pull/9997#discussion_r344485587 ########## File path: runners/flink/src/main/java/org/apache/beam/runners/flink/FlinkPipelineRunner.java ########## @@ -134,6 +138,69 @@ private PortablePipelineResult createPortablePipelineResult( } } + /** + * Patches all input coders of stateful ExecutableStage transforms. Stateful transforms aways have + * a KvCoder as input. Flink partitions the data based on the serialized version of the key. This + * key must retain the same binary representation to be able to serve the state in state requests + * from the SDK Harness from the correct partition. If the binary representation does not match, + * this will result in inconsistent checkpoints because keys are associated to a Flink key group + * which does not belong to the key group range of the state handling operator. + */ + private static RunnerApi.Pipeline lengthPrefixKeyCoderOfStatefulStages( Review comment: Actually, the patching of the Python SDK might not be necessary because combiners cannot contain user state / timers. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 341045) Time Spent: 10h (was: 9h 50m) > Key encoding for state requests is not consistent across SDKs > ------------------------------------------------------------- > > Key: BEAM-8157 > URL: https://issues.apache.org/jira/browse/BEAM-8157 > Project: Beam > Issue Type: Bug > Components: runner-flink > Affects Versions: 2.13.0 > Reporter: Maximilian Michels > Assignee: Maximilian Michels > Priority: Critical > Fix For: 2.17.0 > > Time Spent: 10h > Remaining Estimate: 0h > > The Flink runner requires the internal key to be encoded without a length > prefix (OUTER context). The user state request handler exposes a serialized > version of the key to the Runner. This key is encoded with the NESTED context > which may add a length prefix. We need to convert it to OUTER context to > match the Flink runner's key encoding. > So far this has not caused the Flink Runner to behave incorrectly. However, > with the upcoming support for Flink 1.9, the state backend will not accept > requests for keys not part of any key group/partition of the operator. This > is very likely to happen with the encoding not being consistent. > **NOTE** This is only applicable to the Java SDK, as the Python SDK uses > OUTER encoding for the key in state requests. -- This message was sent by Atlassian Jira (v8.3.4#803005)