QiuMM edited a comment on issue #6724: Fix issue that tasks failed because of no sink for identifier URL: https://github.com/apache/incubator-druid/pull/6724#issuecomment-446306703 @fjy no, because I think It's hard to simulate since this issue happens infrequently which depends on the execution order of code, i.e affected by thread scheduling. Besides, I think there is no need to do, the correctness of this fix is guaranteed by the `ConcurrentHashMap`, we should trust it. The reason why this bug was introduced is that we did not use `ConcurrentHashMap` in a right way before.
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