Hi, Thanks for reporting the problem. This bug was previously unknown to us. I have created a jira ticket for this bug: https://issues.apache.org/jira/browse/FLINK-10491 <https://issues.apache.org/jira/browse/FLINK-10491>
Unfortunately I’m not familiar with running batch jobs in Flink, so I don’t know if there is some hot fix or anything that can at least mitigate/decrease the probability of the bug for you until we fix it properly. Piotrek > On 4 Oct 2018, at 13:55, Aljoscha Krettek <aljos...@apache.org> wrote: > > Hi, > > this looks like a potential Flink bug. Looping in Nico and Piotr who have > looked into that in the past. Could you please comment on that? > > Best, > Aljoscha > >> On 3. Oct 2018, at 12:12, Narayanaswamy, Krishna >> <krishna.narayanasw...@gs.com <mailto:krishna.narayanasw...@gs.com>> wrote: >> >> Hi, >> >> I am trying to run one large single job graph which has > 10k tasks. The >> form of the graph is something like >> DataSource -> Filter -> Map [...multiple] >> Sink1 >> Sink2 >> I am using a parallelism of 10 with 1 slot per task manager and a memory >> allocation of 32G per TM. The JM is running with 8G. >> >> Everything starts up and runs fine with close to 6-7k tasks (this is >> variable and is mostly the source /filter/map portions) completing and then >> the graph just hangs. I managed to connect to the task managers and get a >> thread dump just in time and found the following deadlock on one of the TMs >> which apparently seems to be holding up everything else. >> Please could someone take a look and advise if there is something I could do >> or try out to fix this. >> >> Marked below are the 2 isolated thread stacks marking the deadlock - >> >> 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) >> >> Thanks, >> Krishna. >> >> >> ________________________________ >> >> Your Personal Data: We may collect and process information about you that >> may be subject to data protection laws. For more information about how we >> use and disclose your personal data, how we protect your information, our >> legal basis to use your information, your rights and who you can contact, >> please refer to: www.gs.com/privacy-notices >> <http://www.gs.com/privacy-notices>
