Kishor Patil created STORM-292:
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Summary: emit blocks the publishing bolt if disrupter queue is
full
Key: STORM-292
URL: https://issues.apache.org/jira/browse/STORM-292
Project: Apache Storm (Incubating)
Issue Type: Bug
Affects Versions: 0.9.2-incubating
Reporter: Kishor Patil
During testing, i notice once the disruptor queue is full, it blocks
(timed_wait ) the publishing bolt essentially creating slowdown live-lock.
Should the outputCollector.emit be a non-blocking call?
Below is example of topology that re-creates live lock scenario with disruptor
queue.
https://github.com/kishorvpatil/incubator-storm/blob/dqueue-full/examples/storm-starter/src/jvm/storm/starter/SplitJoinTopology.java
"Thread-9-splitjoinbolt" prio=10 tid=0x00007fe518a9f000 nid=0x64b5 waiting on
condition [0x00007fe5144f2000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:349)
at
com.lmax.disruptor.SingleThreadedClaimStrategy.waitForFreeSlotAt(SingleThreadedClaimStrategy.java:129)
at
com.lmax.disruptor.SingleThreadedClaimStrategy.incrementAndGet(SingleThreadedClaimStrategy.java:81)
at com.lmax.disruptor.Sequencer.next(Sequencer.java:127)
at backtype.storm.utils.DisruptorQueue.publish(DisruptorQueue.java:113)
at backtype.storm.disruptor$publish.invoke(disruptor.clj:51)
at
backtype.storm.daemon.executor$mk_executor_transfer_fn$this__4913.invoke(executor.clj:176)
at
backtype.storm.daemon.executor$mk_executor_transfer_fn$this__4913.invoke(executor.clj:183)
at
backtype.storm.daemon.executor$mk_executor_transfer_fn$this__4913.invoke(executor.clj:185)
at
backtype.storm.daemon.executor$fn__5141$fn__5155$bolt_emit__5184.invoke(executor.clj:683)
at
backtype.storm.daemon.executor$fn__5141$fn$reify__5190.emit(executor.clj:693)
at backtype.storm.task.OutputCollector.emit(OutputCollector.java:186)
at backtype.storm.task.OutputCollector.emit(OutputCollector.java:32)
at
backtype.storm.topology.BasicOutputCollector.emit(BasicOutputCollector.java:19)
at
storm.starter.bolt.SplitAndCountBolt.execute(SplitAndCountBolt.java:24)
at
backtype.storm.topology.BasicBoltExecutor.execute(BasicBoltExecutor.java:33)
at
backtype.storm.daemon.executor$fn__5141$tuple_action_fn__5143.invoke(executor.clj:634)
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