I think it depends on what you want to extract and how you want to extract. Connectors are meant to call external services which could involve Hadoop as well. BIX is meant to do the extraction part of your ETL process. If the volumes are large, BIX is the right choice. That said, there is no direct support for Hadoop in BIX. You can extract to XML, CSV or DB (RDBMS) and then load it up into Hadoop.
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