jihoonson opened a new issue #8836: Parallel indexing task fails during the rolling update URL: https://github.com/apache/incubator-druid/issues/8836 ### Affected Version 0.16 ### Description There are roughly two types of rolling update. One is stopping MMs immediately and restarting them with a newer version. Another is spawning a new instance for a new MM, waiting for an old MM to finish all running tasks and stopping it. Parallel indexing task fails with the below message during the second type of rolling update. ``` java.lang.RuntimeException: org.apache.druid.java.util.common.ISE: Failed to post task[AbstractTask{id='single_phase_sub_task_exchange_report_sampled_2019-11-06T21:25:33.976Z', groupId='index_parallel_exchange_report_sampled_2019-11-06T21:25:26.427Z', taskResource=TaskResource{availabilityGroup='single_phase_sub_task_exchange_report_sampled_2019-11-06T21:25:33.976Z', requiredCapacity=1}, dataSource='exchange_report_sampled', context={}}] with error[{"error":"Could not resolve type id 'single_phase_sub_task' into a subtype of [simple type, class org.apache.druid.indexing.common.task.Task]: known type ids = [Task, archive, compact, index, index_hadoop, index_kafka, index_kinesis, index_parallel, index_realtime, index_realtime_appenderator, index_sub, kill, move, noop, restore]\n at [Source: HttpInputOverHTTP@43b1d6e5[c=4286,q=0,[0]=null,s=STREAM]; line: 1, column: 2]"}]. ``` This is because one of the sub task type name has been changed in https://github.com/apache/incubator-druid/pull/8257. Note we should be able to upgrade the overload last. I think the supervisor task can first try to issue a sub task with the new type name, and then retry with the old name if the first try fails with the above error.
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