Alfonso Nishikawa created GORA-411:
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             Summary: Add exists(key) to DataStore interface
                 Key: GORA-411
                 URL: https://issues.apache.org/jira/browse/GORA-411
             Project: Apache Gora
          Issue Type: Improvement
          Components: gora-core, storage
            Reporter: Alfonso Nishikawa
            Priority: Minor


NUTCH-1679 need to check if there exists some rows and they are proposing to use {{store.get(TableUtil.reverseUrl(url)))}}.
This will have a considerably impact on performance since every column will be fetched.

Some datastores implements a call to just check if a row exists (like HBase) so no data is transfered by network.
If a datastore can't handle an "exists" call, can default to a get.



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