QiuMM commented on issue #6336: update insert pending segments logic to synchronous URL: https://github.com/apache/incubator-druid/pull/6336#issuecomment-446211138 @FaxianZhao @jihoonson I think this PR should be reverted, after merged this PR, it takes very long time to open the overlord console. In my scenario, there are 1200 peon tasks and we use mysql as the metastore. In this PR, use `TaskLockbox#doInCriticalSection` to perform allocating pending segments which seems would block other things. After revert this, my overlord work fine again. 
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