samperson1997 commented on issue #417: [IOTDB-234] Refactor TsFile storage on 
   > I think using reflection every time is too heavy and slow when all you 
want to do is to get a new Object. To put it simply, reflections should be used 
as less frequently as possible.
   > Here is my suggestion: use two factories (the LocalFactory and the 
HDFSFactory) instead of one, and initialize one of them using reflection 
according to the configuration at the system start-up. Thus the occurrence of 
reflections can be reduced to only 1.
   Hi, many thanks for your useful suggestion!
   In the new commit, I tried to reduce the occurrence of reflections to only 1 
by initializing `private static Class<?> clazz` when constructing 
`TSFileFactory`. I think this also reached your main purpose, so I didn't use 
two factories... Do you think it is acceptable? > <

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