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Posted to issues@ambari.apache.org by "bd2019us (JIRA)" <ji...@apache.org> on 2019/04/12 05:52:00 UTC

[jira] [Created] (AMBARI-25241) Date.getTime() can be changed to System.currentTimeMillis()

bd2019us created AMBARI-25241:
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             Summary: Date.getTime() can be changed to System.currentTimeMillis()
                 Key: AMBARI-25241
                 URL: https://issues.apache.org/jira/browse/AMBARI-25241
             Project: Ambari
          Issue Type: Bug
            Reporter: bd2019us


Location: contrib/views/wfmanager/src/main/java/org/apache/oozie/ambari/view/repo/BaseRepo.java:89

Hello,
I found that Date.getTime() can be changed to light method System.currentTimeMillis(),which can avoid creating the temporary Date object.
new Date() is a thin wrapper of method System.currentTimeMillis(). The performance will be greatly damaged if it is invoked too much times.
According to my local testing at the same environment, System.currentTimeMillis() can achieve a speedup to 5 times (435ms vs 2073ms), when these two methods are invoked 5,000,000 times.



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