Hi guys,

         We upgrade out CDH cluster from 5.5 to 5.7 at Sep 20, and from the 
following figure:


         You can see the catalog server in impala 2.5 use much more memory than 
what in impala 2.3 and causes the out of memory error.

         We set the Load Catalog In Background = false and restart the service 
but not help.

         We set Java Heap Size of Catalog Server in Bytes from 32G to 64G ,but 
the memory usage also increase to 64G.

         Is there any bugs in catalog server for impala 2.5? Any suggestion for 



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