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Posted to issues@flink.apache.org by "Piotr Nowojski (Jira)" <ji...@apache.org> on 2021/06/11 12:45:00 UTC
[jira] [Assigned] (FLINK-22882) Tasks are blocked while emitting
records
[ https://issues.apache.org/jira/browse/FLINK-22882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Piotr Nowojski reassigned FLINK-22882:
--------------------------------------
Assignee: Piotr Nowojski
> Tasks are blocked while emitting records
> ----------------------------------------
>
> Key: FLINK-22882
> URL: https://issues.apache.org/jira/browse/FLINK-22882
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Network, Runtime / Task
> Affects Versions: 1.14.0
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Critical
>
> On a cluster I observed symptoms of tasks being blocked for long time, causing long delays with unaligned checkpointing. 1% of those cases were caused by emitting records:
> {noformat}
> 2021-06-04 14:40:24,115 ERROR org.apache.flink.runtime.io.network.buffer.LocalBufferPool [] - Blocking wait [16497 ms] for an available buffer.
> java.lang.Exception: Stracktracegenerator
> at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestMemorySegmentBlocking(LocalBufferPool.java:323) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBufferBuilderBlocking(LocalBufferPool.java:290) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.io.network.partition.BufferWritingResultPartition.requestNewBufferBuilderFromPool(BufferWritingResultPartition.java:338) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.io.network.partition.BufferWritingResultPartition.requestNewUnicastBufferBuilder(BufferWritingResultPartition.java:314) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.io.network.partition.BufferWritingResultPartition.appendUnicastDataForRecordContinuation(BufferWritingResultPartition.java:258) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.io.network.partition.BufferWritingResultPartition.emitRecord(BufferWritingResultPartition.java:147) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:104) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.io.network.api.writer.ChannelSelectorRecordWriter.emit(ChannelSelectorRecordWriter.java:54) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.io.RecordWriterOutput.pushToRecordWriter(RecordWriterOutput.java:105) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:90) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:44) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:56) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:29) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:38) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.ChainingOutput.pushToOperator(ChainingOutput.java:101) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.ChainingOutput.collect(ChainingOutput.java:82) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.ChainingOutput.collect(ChainingOutput.java:39) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.SourceOperatorStreamTask$AsyncDataOutputToOutput.emitRecord(SourceOperatorStreamTask.java:182) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.api.operators.source.SourceOutputWithWatermarks.collect(SourceOutputWithWatermarks.java:110) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.api.operators.source.SourceOutputWithWatermarks.collect(SourceOutputWithWatermarks.java:101) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.api.connector.source.lib.util.IteratorSourceReader.pollNext(IteratorSourceReader.java:98) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.api.operators.SourceOperator.emitNext(SourceOperator.java:294) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.io.StreamTaskSourceInput.emitNext(StreamTaskSourceInput.java:69) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:66) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:422) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:204) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:680) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.StreamTask.executeInvoke(StreamTask.java:635) ~[flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.StreamTask.runWithCleanUpOnFail(StreamTask.java:646) [flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:619) [flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:779) [flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:566) [flink-dist_2.11-1.14-SNAPSHOT.jar:1.14-SNAPSHOT]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
> {noformat}
> *All of those cases that I have seen were always coming from SourceOperator*
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