zhangboren93 opened a new issue, #4281: URL: https://github.com/apache/carbondata/issues/4281
I found that reading carbon files from CarbonReader takes long time in "SimpleDateFormat.<init>", see attached file for output of profiling. https://github.com/apache/carbondata/blob/4b8846d1e6737e7db8a96014818c067c8c253d1f/sdk/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java#L207 I wonder if it is OK if we add some lazy initialization to SimpleDateFormat in the class, and if so should it support multi-threading. [profile.zip](https://github.com/apache/carbondata/files/8954954/profile.zip) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@carbondata.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org