Details
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Bug
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Status: Closed
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Critical
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Resolution: Fixed
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1.5.4, 1.6.1
Description
Originally reported here: https://lists.apache.org/thread.html/472c8f4a2711c5e217fadd9a88f8c73670218e7432bb81ba3f5076db@%3Cuser.flink.apache.org%3E
Thread dump (from 1.5.3 version) showing two deadlocked threads, because they are taking two locks in different order:
Thread-1 "DataSink (DATA#HadoopFileOutputFormat ) (1/2)@11002" prio=5 tid=0x3e2 nid=NA waiting for monitor entry waiting for Map (Key Extractor) (1/10)@9967 to release lock on <0x2dfb> (a java.util.ArrayDeque) at org.apache.flink.runtime.io.network.partition.SpillableSubpartition.releaseMemory(SpillableSubpartition.java:223) at org.apache.flink.runtime.io.network.partition.ResultPartition.releaseMemory(ResultPartition.java:373) at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.setNumBuffers(LocalBufferPool.java:355) - locked <0x2dfd> (a java.util.ArrayDeque) at org.apache.flink.runtime.io.network.buffer.NetworkBufferPool.redistributeBuffers(NetworkBufferPool.java:402) at org.apache.flink.runtime.io.network.buffer.NetworkBufferPool.recycleMemorySegments(NetworkBufferPool.java:203) - locked <0x2da5> (a java.lang.Object) at org.apache.flink.runtime.io.network.buffer.NetworkBufferPool.recycleMemorySegments(NetworkBufferPool.java:193) at org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.returnExclusiveSegments(SingleInputGate.java:318) at org.apache.flink.runtime.io.network.partition.consumer.RemoteInputChannel.releaseAllResources(RemoteInputChannel.java:259) at org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.getNextBufferOrEvent(SingleInputGate.java:578) at org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.pollNextBufferOrEvent(SingleInputGate.java:507) at org.apache.flink.runtime.io.network.partition.consumer.UnionInputGate.waitAndGetNextInputGate(UnionInputGate.java:213) at org.apache.flink.runtime.io.network.partition.consumer.UnionInputGate.getNextBufferOrEvent(UnionInputGate.java:163) at org.apache.flink.runtime.io.network.api.reader.AbstractRecordReader.getNextRecord(AbstractRecordReader.java:86) at org.apache.flink.runtime.io.network.api.reader.MutableRecordReader.next(MutableRecordReader.java:47) at org.apache.flink.runtime.operators.util.ReaderIterator.next(ReaderIterator.java:73) at org.apache.flink.runtime.operators.DataSinkTask.invoke(DataSinkTask.java:216) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:703) at java.lang.Thread.run(Thread.java:745) Thread-2 "Map (Key Extractor) (1/10)@9967" prio=5 tid=0xaab nid=NA waiting for monitor entry java.lang.Thread.State: BLOCKED blocks DataSink (DATA#HadoopFileOutputFormat ) (1/2)@11002 waiting for DataSink (DATA#HadoopFileOutputFormat ) (1/2)@11002 to release lock on <0x2dfd> (a java.util.ArrayDeque) at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.recycle(LocalBufferPool.java:261) at org.apache.flink.runtime.io.network.buffer.NetworkBuffer.deallocate(NetworkBuffer.java:171) at org.apache.flink.shaded.netty4.io.netty.buffer.AbstractReferenceCountedByteBuf.release(AbstractReferenceCountedByteBuf.java:106) at org.apache.flink.runtime.io.network.buffer.NetworkBuffer.recycleBuffer(NetworkBuffer.java:146) at org.apache.flink.runtime.io.network.buffer.BufferConsumer.close(BufferConsumer.java:110) at org.apache.flink.runtime.io.network.partition.SpillableSubpartition.spillFinishedBufferConsumers(SpillableSubpartition.java:271) at org.apache.flink.runtime.io.network.partition.SpillableSubpartition.add(SpillableSubpartition.java:117) - locked <0x2dfb> (a java.util.ArrayDeque) at org.apache.flink.runtime.io.network.partition.SpillableSubpartition.add(SpillableSubpartition.java:96) - locked <0x2dfc> (a org.apache.flink.runtime.io.network.partition.SpillableSubpartition) at org.apache.flink.runtime.io.network.partition.ResultPartition.addBufferConsumer(ResultPartition.java:255) at org.apache.flink.runtime.io.network.api.writer.RecordWriter.requestNewBufferBuilder(RecordWriter.java:211) at org.apache.flink.runtime.io.network.api.writer.RecordWriter.sendToTarget(RecordWriter.java:142) at org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:105) at org.apache.flink.runtime.operators.shipping.OutputCollector.collect(OutputCollector.java:65) at org.apache.flink.runtime.operators.util.metrics.CountingCollector.collect(CountingCollector.java:35) at org.apache.flink.runtime.operators.MapDriver.run(MapDriver.java:103) at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:503) at org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:368) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:703) at java.lang.Thread.run(Thread.java:745)
The same pattern can occur on the master (but with slightly shifted line numbers)
CC [~NicoK]
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