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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