QiuMM edited a comment on issue #6722: tasks failed because of no sink for identifier URL: https://github.com/apache/incubator-druid/issues/6722#issuecomment-446105885 @dyf6372 you are right, according to the implementations of ConcurrentHashMap, I found using iterator to traverse the `sinks` can avoid this bug. But the iterator must be obtained by `entrySet().iterator()`, using `keySet().iterator()` will face the same issue. I have tested it and it worked!
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