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
>

Reply via email to