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Steven Zhen Wu edited comment on FLINK-23886 at 9/22/21, 3:58 PM: ------------------------------------------------------------------ Just to add another data point. We observed the same issue with Flink 1.13.2 in production. We don't know how to reproduce this type of tricky state corruption problem ``` org.apache.flink.util.FlinkRuntimeException: Error while deserializing the element. at org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.deserializeElement(RocksDBCachingPriorityQueueSet.java:388) at org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.peek(RocksDBCachingPriorityQueueSet.java:145) at org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.peek(RocksDBCachingPriorityQueueSet.java:58) at org.apache.flink.runtime.state.heap.KeyGroupPartitionedPriorityQueue$InternalPriorityQueueComparator.comparePriority(KeyGroupPartitionedPriorityQueue.java:285) at org.apache.flink.runtime.state.heap.KeyGroupPartitionedPriorityQueue$InternalPriorityQueueComparator.comparePriority(KeyGroupPartitionedPriorityQueue.java:271) at org.apache.flink.runtime.state.heap.HeapPriorityQueue.isElementPriorityLessThen(HeapPriorityQueue.java:161) at org.apache.flink.runtime.state.heap.HeapPriorityQueue.siftUp(HeapPriorityQueue.java:118) at org.apache.flink.runtime.state.heap.HeapPriorityQueue.addInternal(HeapPriorityQueue.java:82) at org.apache.flink.runtime.state.heap.AbstractHeapPriorityQueue.add(AbstractHeapPriorityQueue.java:71) at org.apache.flink.runtime.state.heap.KeyGroupPartitionedPriorityQueue.<init>(KeyGroupPartitionedPriorityQueue.java:93) at org.apache.flink.contrib.streaming.state.RocksDBPriorityQueueSetFactory.create(RocksDBPriorityQueueSetFactory.java:113) at org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend.create(RocksDBKeyedStateBackend.java:476) at org.apache.flink.streaming.api.operators.InternalTimeServiceManagerImpl.createTimerPriorityQueue(InternalTimeServiceManagerImpl.java:174) at org.apache.flink.streaming.api.operators.InternalTimeServiceManagerImpl.registerOrGetTimerService(InternalTimeServiceManagerImpl.java:160) at org.apache.flink.streaming.api.operators.InternalTimeServiceManagerImpl.getInternalTimerService(InternalTimeServiceManagerImpl.java:136) at org.apache.flink.streaming.api.operators.AbstractStreamOperator.getInternalTimerService(AbstractStreamOperator.java:620) at org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.open(WindowOperator.java:225) at org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:442) at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreGates(StreamTask.java:582) at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.call(StreamTaskActionExecutor.java:55) at org.apache.flink.streaming.runtime.tasks.StreamTask.executeRestore(StreamTask.java:562) at org.apache.flink.streaming.runtime.tasks.StreamTask.runWithCleanUpOnFail(StreamTask.java:647) at org.apache.flink.streaming.runtime.tasks.StreamTask.restore(StreamTask.java:537) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:759) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:566) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: java.io.EOFException at org.apache.flink.core.memory.DataInputDeserializer.readUnsignedByte(DataInputDeserializer.java:329) at org.apache.flink.types.StringValue.readString(StringValue.java:781) at org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:73) at org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:31) at org.apache.flink.streaming.api.operators.TimerSerializer.deserialize(TimerSerializer.java:161) at org.apache.flink.streaming.api.operators.TimerSerializer.deserialize(TimerSerializer.java:43) at org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.deserializeElement(RocksDBCachingPriorityQueueSet.java:386) ... 25 more ``` was (Author: stevenz3wu): Just to add another data point. We observed the same issue with Flink 1.13.2 in production. We don't know how to reproduce this type of tricky state corruption problem > An exception is thrown out when recover job timers from checkpoint file > ----------------------------------------------------------------------- > > Key: FLINK-23886 > URL: https://issues.apache.org/jira/browse/FLINK-23886 > Project: Flink > Issue Type: Bug > Components: Runtime / State Backends > Affects Versions: 1.10.0, 1.11.3, 1.13.2 > Reporter: JING ZHANG > Priority: Major > Attachments: image-2021-08-25-16-38-04-023.png, > image-2021-08-25-16-38-12-308.png, image-2021-08-25-17-06-29-806.png, > image-2021-08-25-17-07-38-327.png > > > A user report the bug in the [mailist. > |http://mail-archives.apache.org/mod_mbox/flink-user/202108.mbox/%3ccakmsf43j14nkjmgjuy4dh5qn2vbjtw4tfh4pmmuyvcvfhgf...@mail.gmail.com%3E]I > paste the content here. > Setup Specifics: > Version: 1.6.2 > RocksDB Map State > Timers stored in rocksdb > > When we have this job running for long periods of time like > 30 days, if > for some reason the job restarts, we encounter "Error while deserializing the > element". Is this a known issue fixed in later versions? I see some changes > to code for FLINK-10175, but we don't use any queryable state > > Below is the stack trace > > org.apache.flink.util.FlinkRuntimeException: Error while deserializing the > element. > at > org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.deserializeElement(RocksDBCachingPriorityQueueSet.java:389) > at > org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.peek(RocksDBCachingPriorityQueueSet.java:146) > at > org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.peek(RocksDBCachingPriorityQueueSet.java:56) > at > org.apache.flink.runtime.state.heap.KeyGroupPartitionedPriorityQueue$InternalPriorityQueueComparator.comparePriority(KeyGroupPartitionedPriorityQueue.java:274) > at > org.apache.flink.runtime.state.heap.KeyGroupPartitionedPriorityQueue$InternalPriorityQueueComparator.comparePriority(KeyGroupPartitionedPriorityQueue.java:261) > at > org.apache.flink.runtime.state.heap.HeapPriorityQueue.isElementPriorityLessThen(HeapPriorityQueue.java:164) > at > org.apache.flink.runtime.state.heap.HeapPriorityQueue.siftUp(HeapPriorityQueue.java:121) > at > org.apache.flink.runtime.state.heap.HeapPriorityQueue.addInternal(HeapPriorityQueue.java:85) > at > org.apache.flink.runtime.state.heap.AbstractHeapPriorityQueue.add(AbstractHeapPriorityQueue.java:73) > at > org.apache.flink.runtime.state.heap.KeyGroupPartitionedPriorityQueue.<init>(KeyGroupPartitionedPriorityQueue.java:89) > at > org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$RocksDBPriorityQueueSetFactory.create(RocksDBKeyedStateBackend.java:2792) > at > org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend.create(RocksDBKeyedStateBackend.java:450) > at > org.apache.flink.streaming.api.operators.InternalTimeServiceManager.createTimerPriorityQueue(InternalTimeServiceManager.java:121) > at > org.apache.flink.streaming.api.operators.InternalTimeServiceManager.registerOrGetTimerService(InternalTimeServiceManager.java:106) > at > org.apache.flink.streaming.api.operators.InternalTimeServiceManager.getInternalTimerService(InternalTimeServiceManager.java:87) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.getInternalTimerService(AbstractStreamOperator.java:764) > at > org.apache.flink.streaming.api.operators.KeyedProcessOperator.open(KeyedProcessOperator.java:61) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:424) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:290) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711) > at java.lang.Thread.run(Thread.java:748) > Caused by: java.io.EOFException > at java.io.DataInputStream.readUnsignedByte(DataInputStream.java:290) > at org.apache.flink.types.StringValue.readString(StringValue.java:769) > at > org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:69) > at > org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:28) > at > org.apache.flink.api.java.typeutils.runtime.RowSerializer.deserialize(RowSerializer.java:179) > at > org.apache.flink.api.java.typeutils.runtime.RowSerializer.deserialize(RowSerializer.java:46) > at > org.apache.flink.streaming.api.operators.TimerSerializer.deserialize(TimerSerializer.java:168) > at > org.apache.flink.streaming.api.operators.TimerSerializer.deserialize(TimerSerializer.java:45) > at > org.apache.flink.contrib.streaming.state.RocksDBCachingPriorityQueueSet.deserializeElement(RocksDBCachingPriorityQueueSet.java:387) > ... 20 more -- This message was sent by Atlassian Jira (v8.3.4#803005)