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can we use --merge-key in incremental import from DB2 ?

I am doing incremental import from DB2 to HDFS(based on last modified column),I traied to import directly to Hive,Its throwing error tht hive will not support incremental import, so I tried to HDFS, I have used --merge-key , but I am getting duplicates and I didn't find any difference with and with out --merge-key option., Is there any option for incremental importing with out duplicates