[jira] [Created] (FLINK-21263) Job hangs under backpressure

[Shang Yuanchun (Jira)]

Lu Niu created FLINK-21263:
------------------------------

             Summary: Job hangs under backpressure
                 Key: FLINK-21263
                 URL: https://issues.apache.org/jira/browse/FLINK-21263
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.11.0
            Reporter: Lu Niu
         Attachments: source_graph.svg, source_js1, source_js2, source_js3

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.

{code:java}
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){code}
 

 



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