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Thrift API will remain backward compatible for external table. That is, new server can deal with old client. If the old client issue a create_table call, server side will receive the request of create_table with validWriteIdList=null, and will cache or retrieve the entry regardless. For managed table, validWriteIdList will be required and HMS server will throw an exception if validWriteIdList=null.

hive_metastore.thriftOld API

New API

create_table(Table tbl)

create_table(Table tbl,string validWriteIdList)

get_table(string dbname,string tbl_name)

get_table(string dbname,string tbl_name,string validWriteIdList)

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