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Posted to commits@heron.apache.org by GitBox <gi...@apache.org> on 2018/06/22 22:33:14 UTC

[GitHub] nlu90 opened a new pull request #2935: make EvitionContext extend Serializable

nlu90 opened a new pull request #2935: make EvitionContext extend Serializable
URL: https://github.com/apache/incubator-heron/pull/2935
 
 
   Previously without extending the `Serializable` interface, a tumbling window in stateful processing causes the following exception:
   
   ```
   [2018-06-22 13:16:01 -0700] [SEVERE] org.apache.heron.instance.HeronInstance: Exception caught in thread: SlaveThread with id: 13 
   java.lang.ClassCastException: org.apache.heron.api.windowing.DefaultEvictionContext cannot be cast to java.io.Serializable
   	at org.apache.heron.api.windowing.WindowManager.getState(WindowManager.java:350)
   	at org.apache.heron.api.bolt.WindowedBoltExecutor.preSave(WindowedBoltExecutor.java:452)
   	at org.apache.heron.api.bolt.StatefulWindowedBoltExecutor.preSave(StatefulWindowedBoltExecutor.java:61)
   	at org.apache.heron.instance.bolt.BoltInstance.persistState(BoltInstance.java:153)
   	at org.apache.heron.instance.bolt.BoltInstance.readTuplesAndExecute(BoltInstance.java:255)
   	at org.apache.heron.instance.bolt.BoltInstance$1.run(BoltInstance.java:220)
   	at org.apache.heron.common.basics.WakeableLooper.executeTasksOnWakeup(WakeableLooper.java:191)
   	at org.apache.heron.common.basics.WakeableLooper.runOnce(WakeableLooper.java:110)
   	at org.apache.heron.common.basics.WakeableLooper.loop(WakeableLooper.java:100)
   	at org.apache.heron.instance.Slave.run(Slave.java:185)
   	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   	at java.lang.Thread.run(Thread.java:745)
    ```
   
   This PR fixes the problem and also added one example.

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