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This change adds the ability to refresh a local cache entry, causing the old cache entry to be dropped and the library to be reloaded from HDFS. This is used in ResolveSymbolLookup(), which is called by the frontend when creating a new a function, and in ImpalaServer when receiving a "create function" heartbeat. This change also makes sure the FE calls into the backend for jars, so jars get refreshed as well. Change-Id: I5fd61c1bc2e04838449335d5a68b61af8b101b01 Reviewed-on: http://gerrit.ent.cloudera.com:8080/2286 Reviewed-by: Skye Wanderman-Milne <skye@cloudera.com> Tested-by: jenkins (cherry picked from commit e8587794b3b82438190c91b2ebe9d1e12db73981) Reviewed-on: http://gerrit.ent.cloudera.com:8080/2348