Hi Giriraj,

This looks like the deserialization of a String failed.
Can you isolate the problem to a pair of sending and receiving tasks?

Best, Fabian

Am So., 5. Apr. 2020 um 20:18 Uhr schrieb Giriraj Chauhan <graj.chauhan@gmail.com>:
Hi,  

We are submitting a flink(1.9.1) job for data processing. It runs fine and processes data for sometime i.e. ~30 mins and later it throws following exception and job gets killed.
 2020-04-02 14:15:43,371 INFO  org.apache.flink.runtime.taskmanager.Task                     - Sink: Unnamed (2/4) (45d01514f0fb99602883ca43e997e8f3) switched from RUNNING to FAILED.
java.io.EOFException
        at org.apache.flink.core.memory.DataInputDeserializer.readUnsignedByte(DataInputDeserializer.java:321)
        at org.apache.flink.types.StringValue.readString(StringValue.java:769)
        at org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:75)
        at org.apache.flink.api.common.typeutils.base.StringSerializer.deserialize(StringSerializer.java:33)
        at org.apache.flink.streaming.runtime.streamrecord.StreamElementSerializer.deserialize(StreamElementSerializer.java:205)
        at org.apache.flink.streaming.runtime.streamrecord.StreamElementSerializer.deserialize(StreamElementSerializer.java:46)
        at org.apache.flink.runtime.plugable.NonReusingDeserializationDelegate.read(NonReusingDeserializationDelegate.java:55)
        at org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptiveSpanningRecordDeserializer.getNextRecord(SpillingAdaptiveSpanningRecordDeserializer.java:141)
        at org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.pollNextNullable(StreamTaskNetworkInput.java:91)
        at org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.pollNextNullable(StreamTaskNetworkInput.java:47)
        at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:135)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:279)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.run(StreamTask.java:301)
        at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:406)
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:705)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
        at java.base/java.lang.Thread.run(Unknown Source)


Once the above exception occur, we do see following runtime exception

java.lang.RuntimeException: Buffer pool is destroyed.
        at org.apache.flink.streaming.runtime.io.RecordWriterOutput.pushToRecordWriter(RecordWriterOutput.java:110)
        at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:89)
        at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:45)
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:727)
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:705)
        at org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51)
        at com.dell.emc.mars.topology.bl.DiffGenerator.handleCreate(DiffGenerator.java:519)
        at com.dell.emc.mars.topology.bl.DiffGenerator.populateHTable(DiffGenerator.java:294)
        at com.dell.emc.mars.topology.bl.DiffGenerator.compare(DiffGenerator.java:58)
        at com.dell.emc.mars.topology.bl.CompareWithDatabase.flatMap(CompareWithDatabase.java:146)
        at com.dell.emc.mars.topology.bl.CompareWithDatabase.flatMap(CompareWithDatabase.java:22)
        at org.apache.flink.streaming.api.operators.StreamFlatMap.processElement(StreamFlatMap.java:50)
        at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:637)
        at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:612)
        at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:592)
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:727)
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:705)
        at org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51)
        at com.dell.emc.mars.topology.bl.CompareWithModel.flatMap(CompareWithModel.java:110)
        at com.dell.emc.mars.topology.bl.CompareWithModel.flatMap(CompareWithModel.java:24)
        at org.apache.flink.streaming.api.operators.StreamFlatMap.processElement(StreamFlatMap.java:50)
        at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:637)
        at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:612)
        at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:592)
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:727)
        at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:705)
        at org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51)
        at com.dell.emc.mars.topology.bl.DiscoveryHandler.handleDisHoldJobs(DiscoveryHandler.java:180)
        at com.dell.emc.mars.topology.bl.DiscoveryHandler.lambda$handleEndMessage$0(DiscoveryHandler.java:138)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: Buffer pool is destroyed.
        at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestMemorySegment(LocalBufferPool.java:239)
        at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBufferBuilderBlocking(LocalBufferPool.java:213)
        at org.apache.flink.runtime.io.network.partition.ResultPartition.getBufferBuilder(ResultPartition.java:181)
        at org.apache.flink.runtime.io.network.api.writer.RecordWriter.requestNewBufferBuilder(RecordWriter.java:256)
        at org.apache.flink.runtime.io.network.api.writer.RecordWriter.getBufferBuilder(RecordWriter.java:249)
        at org.apache.flink.runtime.io.network.api.writer.RecordWriter.copyFromSerializerToTargetChannel(RecordWriter.java:169)
        at org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:154)
        at org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:120)
        at org.apache.flink.streaming.runtime.io.RecordWriterOutput.pushToRecordWriter(RecordWriterOutput.java:107)
        ... 29 more

We are trying to catch/handle the exception but somehow job is getting cancelled by manager.
Any opinion on what could be going wrong and how to get our arms around it?

Best Regards,
Giriraj