[jira] [Commented] (GORA-411) Add exists(key) to DataStore interface

["Lewis John McGibbney (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GORA-411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14746826#comment-14746826 ] 

Lewis John McGibbney commented on GORA-411:
-------------------------------------------

This would be a real nice addition to the DataStore API [~alfonso.nishikawa]

> 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: 0.7
>
>
> 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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