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The fix "IMPALA-2648/IMPALA-2664" introduced a conservative limitation on the maximum serialized size of incremental stats. As a side effect, some users with very large tables are experiencing regressions especially when they upgrade impala and the serialized size goes beyond 200MB. To mitigate the issue, the change introduces a new gflag, 'inc_stats_size_limit_bytes' to make the max serialized size configurable, which allows impala users to specify their own maximum serialized size. Default value for inc_stats_size_limit_bytes is 200MB. The change introduces a TBackendGflags class to pass the gflags from backend to the Frontend and the Catalog via thrift. This also revamps existing query options to use the TBackendConfig. Change-Id: I33684725a61eabc67237503e61178305d37d3cb5 Reviewed-on: http://gerrit.cloudera.org:8080/4867 Reviewed-by: Bharath Vissapragada <bharathv@cloudera.com> Tested-by: Internal Jenkins