Hi Vijay, I have encountered the same problem several times in online production Flink jobs, but I have not found the root cause of the exception yet. We have walk around the exception by adding the following parameter, hope it could help you. state.backend.rocksdb.timer-service.factory: HEAP
I would invite Yun Tang who is an expert on the topic to look into the problem, we could also create a JIRA to track the issue. [1] https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/ops/state/state_backends/#timers-heap-vs-rocksdb Best, JING ZHANG vijayakumar palaniappan <vijayakuma...@gmail.com> 于2021年8月19日周四 上午8:02写道： > 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 > > -- > Thanks, > -Vijay >
