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https://issues.apache.org/jira/browse/FLINK-22686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17349351#comment-17349351
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Till Rohrmann commented on FLINK-22686:
---------------------------------------
Would it make sense to disable UC for broadcast partitionings?
> Incompatible subtask mappings while resuming from unaligned checkpoints
> -----------------------------------------------------------------------
>
> Key: FLINK-22686
> URL: https://issues.apache.org/jira/browse/FLINK-22686
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.13.0
> Reporter: Arvid Heise
> Assignee: Dawid Wysakowicz
> Priority: Blocker
> Fix For: 1.14.0
>
> Attachments: topology_1.png, topology_2.png, topology_3.png
>
>
> A user
> [reported|https://lists.apache.org/x/list.html?u...@flink.apache.org:lte=1M:Flink%201.13.0%20reactive%20mode:%20Job%20stop%20and%20cannot%20restore%20from%20checkpoint]
> that he encountered an internal error while resuming during reactive mode.
> There isn't an immediate connection to reactive mode, so it's safe to assume
> that one rescaling case was not covered.
> {noformat}
> Caused by: java.lang.IllegalStateException: Incompatible subtask mappings:
> are multiple operators ingesting/producing intermediate results with varying
> degrees of parallelism?Found RescaleMappings{mappings=[[0, 1, 2, 3, 4, 5, 6,
> 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
> 27, 28, 29], [30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45,
> 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59], [60, 61, 62, 63, 64,
> 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
> 84, 85, 86, 87, 88, 89], [90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101,
> 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116,
> 117, 118, 119], [120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131,
> 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146,
> 147, 148, 149], [150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161,
> 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176,
> 177, 178, 179], [180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
> 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206,
> 207, 208, 209]]} and RescaleMappings{mappings=[[0, 7, 14, 21, 28, 35, 42, 49,
> 56, 63, 70, 77, 84, 91, 98, 105, 112, 119, 126, 133, 140, 147, 154, 161, 168,
> 175, 182, 189, 196, 203], [1, 8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85,
> 92, 99, 106, 113, 120, 127, 134, 141, 148, 155, 162, 169, 176, 183, 190, 197,
> 204], [2, 9, 16, 23, 30, 37, 44, 51, 58, 65, 72, 79, 86, 93, 100, 107, 114,
> 121, 128, 135, 142, 149, 156, 163, 170, 177, 184, 191, 198, 205], [3, 10, 17,
> 24, 31, 38, 45, 52, 59, 66, 73, 80, 87, 94, 101, 108, 115, 122, 129, 136,
> 143, 150, 157, 164, 171, 178, 185, 192, 199, 206], [4, 11, 18, 25, 32, 39,
> 46, 53, 60, 67, 74, 81, 88, 95, 102, 109, 116, 123, 130, 137, 144, 151, 158,
> 165, 172, 179, 186, 193, 200, 207], [5, 12, 19, 26, 33, 40, 47, 54, 61, 68,
> 75, 82, 89, 96, 103, 110, 117, 124, 131, 138, 145, 152, 159, 166, 173, 180,
> 187, 194, 201, 208], [6, 13, 20, 27, 34, 41, 48, 55, 62, 69, 76, 83, 90, 97,
> 104, 111, 118, 125, 132, 139, 146, 153, 160, 167, 174, 181, 188, 195, 202,
> 209]]}.
> at
> org.apache.flink.runtime.checkpoint.TaskStateAssignment.checkSubtaskMapping(TaskStateAssignment.java:322)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.checkpoint.TaskStateAssignment.getInputMapping(TaskStateAssignment.java:306)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.checkpoint.StateAssignmentOperation.reDistributeInputChannelStates(StateAssignmentOperation.java:409)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.checkpoint.StateAssignmentOperation.assignAttemptState(StateAssignmentOperation.java:193)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.checkpoint.StateAssignmentOperation.assignStates(StateAssignmentOperation.java:139)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.checkpoint.CheckpointCoordinator.restoreLatestCheckpointedStateInternal(CheckpointCoordinator.java:1566)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.checkpoint.CheckpointCoordinator.restoreSavepoint(CheckpointCoordinator.java:1646)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.scheduler.DefaultExecutionGraphFactory.tryRestoreExecutionGraphFromSavepoint(DefaultExecutionGraphFactory.java:163)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.scheduler.DefaultExecutionGraphFactory.createAndRestoreExecutionGraph(DefaultExecutionGraphFactory.java:138)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.scheduler.adaptive.AdaptiveScheduler.createExecutionGraphAndRestoreState(AdaptiveScheduler.java:986)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.scheduler.adaptive.AdaptiveScheduler.lambda$createExecutionGraphAndRestoreStateAsync$25(AdaptiveScheduler.java:976)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> org.apache.flink.runtime.scheduler.adaptive.BackgroundTask.lambda$new$0(BackgroundTask.java:57)
> ~[flink-dist_2.12-1.13.0.jar:1.13.0]
> at
> java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:642)
> ~[?:?]
> at
> java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
> ~[?:?]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[?:?]
> at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
> ~[?:?]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> ~[?:?]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> ~[?:?]
> at java.lang.Thread.run(Thread.java:834) ~[?:?]
> {noformat}
> Here it seems that the same gate gets input from a range-partitioned and a
> round-robin partitioned channel at the same time. During the implementation
> of FLINK-19801, we couldn't find such a case and optimized the implementation
> accordingly.
> We have asked the user to provide his topology.
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