Github user carsonwang commented on the pull request:
https://github.com/apache/spark/pull/10994#issuecomment-179567757
I think we should also reusing a Calendar object in each thread. It is
expensive to create java Calendar and Timezone objects each time the method is
called. I noticed the same problem and I saw performance boost if reusing these
objects. The duration of one stage was improved from 1.6 minutes to 1.2
minutes. @wangyang1992 @rxin
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