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https://issues.apache.org/jira/browse/GORA-411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16811623#comment-16811623
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John Mora commented on GORA-411:
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Hi [~djkevincr]
That's a good point, new datastore developers could miss the fact that the
exists method should have a customized implementation and it could lead to
future performance issues. I will fix that and other comments you guys left on
github. Thanks for your help.
> 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
> Fix For: 0.9
>
>
> 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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