Reduce delay before flush when large timekey and small timekey_wait a… #2291
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When large timekey and relatively small timekey_wait are given, the delay before flush could be too long. The cause is running interval of enqueue thread which is set as timekey / 11.0. If timekey is 86400 (1 day), the interval is 7854 seconds. Even if timekey_wait is set to 600 seconds in this case, the actual delay before flush could be up to 600+7854 seconds. Taking timekey_wait into account for deciding enqueue thread interval would mitigate this.