peng-yongsheng opened a new pull request #1045: Feature/1032 URL: https://github.com/apache/incubator-skywalking/pull/1045 Please answer these questions before submitting pull request - Why submit this pull request? - [X] Improve performance - Related issues #1032 ___ ### New feature or improvement - Describe the details and related test reports. 1. Time stamp format to time bucket performance optimization. 2. Reduce the number of calls to the method named "getMinuteTimeBucket". ``` Before: /utils/timeBucket/getSecondTimeBucket Avg=9768 (nanosecond), Success Rate=100%, Calls=17417, Total=170135908 (nanosecond) /utils/timeBucket/getMinuteTimeBucket Avg=7384 (nanosecond), Success Rate=100%, Calls=82536, Total=609514865 (nanosecond) After: /utils/timeBucket/getSecondTimeBucket Avg=13636 (nanosecond), Success Rate=100%, Calls=3664, Total=49964432 (nanosecond) /utils/timeBucket/getMinuteTimeBucket Avg=6148 (nanosecond), Success Rate=100%, Calls=27512, Total=169161105 (nanosecond) ```
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