Systems, especially slow lookups

Today, the system suddenly becomes very slow,

I looked at the diagnosis, what is normal debugging, open from the background to see

Found three of the CPU is too high,

Check it out.

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The discovery is the data collection statistic request occupies, looked under the system inside discovers the same time has three requests the run;

Summary: This request is made at the same time as the timing of the request must pay attention to the problems caused by

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Systems, especially slow lookups