Details
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Bug
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Status: Closed
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Minor
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Resolution: Abandoned
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1.11.0
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None
Description
We have a flink job that runs fine for a few days but suddenly hangs and could never recover. Once we relanuch the job, the job runs fine. We detected the job has backpressure, but in all other cases, backpressure would only lead to slower consumption but what is wired here is the job made no progress at all. The symptoms looks similar with FLINK-20618
About the job:
1. Reads from Kafka and writes to Kafka
2. version 1.11
3. enabled unaligned checkpoint
symptoms:
- All source/sink throughput drop to 0
- All checkpoint fails immediately after triggering.
- backpressure shows "high" from source to two downstream operators.
- Flamegraph shows all subtask threads are in waiting
- Source jstack shows the Source thread is BLOCKED, as belows.
Source: impression-reader -> impression-filter -> impression-data-conversion (1/60) Stack Trace is: java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000003a3e71330> (a java.util.concurrent.CompletableFuture$Signaller) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1693) at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323) at java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1729) at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895) at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestMemorySegmentBlocking(LocalBufferPool.java:293) at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBufferBuilderBlocking(LocalBufferPool.java:266) at org.apache.flink.runtime.io.network.partition.ResultPartition.getBufferBuilder(ResultPartition.java:213) at org.apache.flink.runtime.io.network.api.writer.RecordWriter.requestNewBufferBuilder(RecordWriter.java:294) at org.apache.flink.runtime.io.network.api.writer.ChannelSelectorRecordWriter.requestNewBufferBuilder(ChannelSelectorRecordWriter.java:103) at org.apache.flink.runtime.io.network.api.writer.ChannelSelectorRecordWriter.getBufferBuilder(ChannelSelectorRecordWriter.java:95) at org.apache.flink.runtime.io.network.api.writer.RecordWriter.copyFromSerializerToTargetChannel(RecordWriter.java:135) at org.apache.flink.runtime.io.network.api.writer.ChannelSelectorRecordWriter.broadcastEmit(ChannelSelectorRecordWriter.java:80) at org.apache.flink.streaming.runtime.io.RecordWriterOutput.emitWatermark(RecordWriterOutput.java:121) at org.apache.flink.streaming.api.operators.CountingOutput.emitWatermark(CountingOutput.java:41) at org.apache.flink.streaming.api.operators.AbstractStreamOperator.processWatermark(AbstractStreamOperator.java:570) at org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitWatermark(OperatorChain.java:638) at org.apache.flink.streaming.api.operators.CountingOutput.emitWatermark(CountingOutput.java:41) at org.apache.flink.streaming.api.operators.AbstractStreamOperator.processWatermark(AbstractStreamOperator.java:570) at org.apache.flink.streaming.runtime.tasks.OperatorChain$ChainingOutput.emitWatermark(OperatorChain.java:638) at org.apache.flink.streaming.api.operators.CountingOutput.emitWatermark(CountingOutput.java:41) at org.apache.flink.streaming.api.operators.StreamSourceContexts$ManualWatermarkContext.processAndEmitWatermark(StreamSourceContexts.java:315) at org.apache.flink.streaming.api.operators.StreamSourceContexts$WatermarkContext.emitWatermark(StreamSourceContexts.java:425) - locked <0x00000006a485dab0> (a java.lang.Object) at org.apache.flink.streaming.connectors.kafka.internals.SourceContextWatermarkOutputAdapter.emitWatermark(SourceContextWatermarkOutputAdapter.java:37) at org.apache.flink.api.common.eventtime.WatermarkOutputMultiplexer.updateCombinedWatermark(WatermarkOutputMultiplexer.java:167) at org.apache.flink.api.common.eventtime.WatermarkOutputMultiplexer.onPeriodicEmit(WatermarkOutputMultiplexer.java:136) at org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher$PeriodicWatermarkEmitter.onProcessingTime(AbstractFetcher.java:574) - locked <0x00000006a485dab0> (a java.lang.Object) at org.apache.flink.streaming.runtime.tasks.StreamTask.invokeProcessingTimeCallback(StreamTask.java:1220) at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$null$16(StreamTask.java:1211) at org.apache.flink.streaming.runtime.tasks.StreamTask$$Lambda$590/1066788035.run(Unknown Source) at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:92) - locked <0x00000006a485dab0> (a java.lang.Object) at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:78) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:282) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxStep(MailboxProcessor.java:190) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:181) at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:566) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:536) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546) at java.lang.Thread.run(Thread.java:748)
