pzhdfy opened a new pull request #6690: bugfix: when building materialized-view, if taskCount>1, may cause concurrentModificationException URL: https://github.com/apache/incubator-druid/pull/6690 In checkSegmentsAndSubmitTasks: for (Map.Entry<Interval, HadoopIndexTask> entry : runningTasks.entrySet()) { Optional<TaskStatus> taskStatus = taskStorage.getStatus(entry.getValue().getId()); if (!taskStatus.isPresent() || !taskStatus.get().isRunnable()) { runningTasks.remove(entry.getKey()); runningVersion.remove(entry.getKey()); } } if taskCount>1, while iterating runningTasks and removing entry from runningTasks will happen concurrent, this will cause concurrentModificationException. use ConcurrentHashMap instead HashMap of for runningTasks,will fix
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