Behavioral changes in Apache Impala

With the upgrade to Thrift 0.16, Thrift now has protection against malicious message in the form of maximum size for messages. This is currently set to 100MB by default. This SP2 release adds a backend flag thrift_rpc_max_message_size to override the default MAX_MESSAGE_SIZE. This new flag is set to 1GB by default to minimize interruption on the existing Impala workload. You may adjust this up to 2GB, which is the hard limit of this flag.