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https://issues.apache.org/jira/browse/FLINK-23886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17404744#comment-17404744
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Arshad Hasib commented on FLINK-23886:
--------------------------------------
{quote}This is only true since Flink 1.11. Before that a few things were done
concurrently, so I could imagine that there are bugs lingering.
{quote}
Thanks all for looking into this. I'm in Vijay's team. We've a number of jobs
that use the same setup of RocksDB timers with incremental checkpoints. This
issue manifests only in the jobs that utilize multiple timers. We have never
seen this in jobs with a single timer only in ~1.5 years. Therefore this indeed
could be a concurrent access issue.
We're currently in the process of ironing out regression with 1.11. In the
meantime, as [~qingru zhang] suggested- should we use HEAP for timers as a
workaround? We've noticed that such a switch is not compatible with savepoint
restart.
> 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
> 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
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