[jira] [Created] (STORM-292) emit blocks the publishing bolt if disrupter queue is full

["Kishor Patil (JIRA)" <ji...@apache.org>]

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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