Till Rohrmann created FLINK-4973:
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Summary: Flakey Yarn tests due to recently added latency marker
Key: FLINK-4973
URL: https://issues.apache.org/jira/browse/FLINK-4973
Project: Flink
Issue Type: Bug
Components: Tests
Affects Versions: 1.2.0
Reporter: Till Rohrmann
Fix For: 1.2.0
The newly introduced {{LatencyMarksEmitter}} emits latency marker on the
{{Output}}. This can still happen after the underlying {{BufferPool}} has been
destroyed. The occurring exception is then logged:
{code}
2016-10-29 15:00:48,088 INFO org.apache.flink.runtime.taskmanager.Task
- Source: Custom File Source (1/1) switched to FINISHED
2016-10-29 15:00:48,089 INFO org.apache.flink.runtime.taskmanager.Task
- Freeing task resources for Source: Custom File Source (1/1)
2016-10-29 15:00:48,089 INFO org.apache.flink.yarn.YarnTaskManager
- Un-registering task and sending final execution state FINISHED to
JobManager for task Source: Custom File Source
(8fe0f817fa6d960ea33f6e57e0c3891c)
2016-10-29 15:00:48,101 WARN
org.apache.flink.streaming.api.operators.AbstractStreamOperator - Error while
emitting latency marker
java.lang.RuntimeException: Buffer pool is destroyed.
at
org.apache.flink.streaming.runtime.io.RecordWriterOutput.emitLatencyMarker(RecordWriterOutput.java:99)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.emitLatencyMarker(AbstractStreamOperator.java:734)
at
org.apache.flink.streaming.api.operators.StreamSource$LatencyMarksEmitter$1.run(StreamSource.java:134)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Buffer pool is destroyed.
at
org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBuffer(LocalBufferPool.java:144)
at
org.apache.flink.runtime.io.network.buffer.LocalBufferPool.requestBufferBlocking(LocalBufferPool.java:133)
at
org.apache.flink.runtime.io.network.api.writer.RecordWriter.sendToTarget(RecordWriter.java:118)
at
org.apache.flink.runtime.io.network.api.writer.RecordWriter.randomEmit(RecordWriter.java:103)
at
org.apache.flink.streaming.runtime.io.StreamRecordWriter.randomEmit(StreamRecordWriter.java:104)
at
org.apache.flink.streaming.runtime.io.RecordWriterOutput.emitLatencyMarker(RecordWriterOutput.java:96)
... 9 more
{code}
This exception is clearly related to the shutdown of a stream operator and does
not indicate a wrong behaviour. Since the yarn tests simply scan the log for
some keywords (including exception) such a case can make them fail.
Best if we could make sure that the {{LatencyMarksEmitter}} would only emit
latency marker if the {{Output}} would still be active. But we could also
simply not log exceptions which occurred after the stream operator has been
stopped.
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