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Check the application log for error or warning logs in the vicinity of the 502 error.
Also, is there a heavy load or a large number of accesses to EC2 or RDS during the time period when the 502 error occurred?
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looks like during the heavy load,but cpu utilization is only 25%,database connection also less than 10
What applications are you running on EC2? Please also provide information about the web server you are using and other information.