Yang Wang created SPARK-13100:
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Summary: improving the performance of stringToDate method in
DateTimeUtils.scala
Key: SPARK-13100
URL: https://issues.apache.org/jira/browse/SPARK-13100
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 1.6.0, 1.5.2
Reporter: Yang Wang
In the stringToDate method in DateTimeUtils.scala, in order to create a
Calendar instance we create a brand new TimeZone instance every time by calling
TimeZone.getTimeZone("GMT"). In jdk1.7, however, this method is synchronized,
thus such an approach can cause significant performance loss. Since the same
time zone is used each time we call that method, I think we should create a val
in the DateTimeUtils singleton object to hold that TimeZone, and use it every
time.
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