storm运行异常之No output fields defined for component:stream XxxBolt:null，definedxxxbolt



错误log：

2015-01-05 17:22:49 [Thread-38-log] ERROR backtype.storm.daemon.executor -
java.lang.RuntimeException: java.lang.IllegalArgumentException: No output fields defined for component:stream XxxBolt:null
        at backtype.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:127) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:96) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:81) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.daemon.executor$fn__4321$fn__4333$fn__4380.invoke(executor.clj:747) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.util$async_loop$fn__457.invoke(util.clj:457) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at clojure.lang.AFn.run(AFn.java:24) [clojure-1.5.1.jar:na]
        at java.lang.Thread.run(Thread.java:662) [na:1.6.0_45]
Caused by: java.lang.IllegalArgumentException: No output fields defined for component:stream XxxBolt:null
        at backtype.storm.task.GeneralTopologyContext.getComponentOutputFields(GeneralTopologyContext.java:113) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.tuple.TupleImpl.<init>(TupleImpl.java:53) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.serialization.KryoTupleDeserializer.deserialize(KryoTupleDeserializer.java:54) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.daemon.executor$mk_task_receiver$fn__4244.invoke(executor.clj:397) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.disruptor$clojure_handler$reify__1668.onEvent(disruptor.clj:59) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        at backtype.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:124) ~[storm-core-0.9.3-rc1.jar:0.9.3-rc1]
        ... 6 common frames omitted

首先检查自己的程序代码有没有错误，在确保自己程序没有错误的前提下，提高并发，多开几个worker就OK了

在并发数很少的情况下，比如我的一个worker，45个并发，上面这个错误是必现的，读者可以自己试试，

至于为什么会这样，后续看代码搞懂之后再来解释


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