coderex2522 opened a new pull request, #1275:
URL: https://github.com/apache/orc/pull/1275

   ### What changes were proposed in this pull request?
   This PR can solve the huge memory taken by BufferedOutputStream and refactor 
the write data logic in class CompressionBase.
   
   ### Why are the changes needed?
   This patch use BlockBuffer to replace DataBuffer  of class 
BufferedOutputStream in order to solve the 
[issue](https://github.com/apache/orc/issues/1240).
   
   ### How was this patch tested?
   The UTs in TestBufferedOutputStream.cc and TestCompression.cc can cover this 
patch.
   


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