jon-wei opened a new pull request #8273: Fix DeterminePartitionsJob reducer when total rows < targetPartitionSize URL: https://github.com/apache/incubator-druid/pull/8273 This PR fixes an `ArrayIndexOutOfBoundsException` when a `targetPartitionSize` is specified but a DeterminePartitionsJob reducer receives an iterable where the total # rows is less than `targetPartitionSize`. ``` 2019-08-08T02:08:11,206 WARN [main] org.apache.hadoop.mapred.YarnChild - Exception running child : java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.elementData(ArrayList.java:422) at java.util.ArrayList.remove(ArrayList.java:499) at org.apache.druid.indexer.DeterminePartitionsJob$DeterminePartitionsDimSelectionReducer.innerReduce(DeterminePartitionsJob.java:712) at org.apache.druid.indexer.DeterminePartitionsJob$DeterminePartitionsDimSelectionBaseReducer.reduce(DeterminePartitionsJob.java:562) at org.apache.druid.indexer.DeterminePartitionsJob$DeterminePartitionsDimSelectionBaseReducer.reduce(DeterminePartitionsJob.java:538) at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171) at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:175) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1836) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:169) ```
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