QiuMM edited a comment on issue #6336: update insert pending segments logic to synchronous URL: https://github.com/apache/incubator-druid/pull/6336#issuecomment-450575795 @jihoonson @FaxianZhao I think I know why the overlord console loading slow after merged this PR, the reason is every index task request overlord to perform a segment allocate action and all tasks occupied a http handle thread which blocked at `TaskLockbox#doInCriticalSection`, so there are no idle threads or resources to response other requests. The larger the cluster, the slower it will be. I tried to increase the value of `druid.server.http.numThreads` and allocate more cores for the overlord, but it's not helpful. In my view, this PR let we lose more than what we gained.
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