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This commit improves the memory requirements for storing file and block metadata in the catalog and the impalad nodes by using the FlatBuffers serialization library. Testing: Passed an exhaustive tests run. Benchmark: Memory requirement for storing an HDFS table with 250K files is reduced by 2.5X. Change-Id: I483d3cadc9d459f71a310c35a130d073597b0983 Reviewed-on: http://gerrit.cloudera.org:8080/6406 Reviewed-by: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com> Tested-by: Impala Public Jenkins