Actually, it looks like you might be able to change the base filename using "mapreduce.output.basename". Try adding -Dmapreduce.output.basename=myoutputprefix or adding this to the sqoop-site.xml? Using Sqoop1, you should be able to provide --append to add to an existing directory. See http://sqoop.apache.org/docs/1.4.2/SqoopUserGuide.html#_controlling_the_import_process for more info.
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