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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10256) Handling of value argument being null for checkAndDelete
Date Sun, 29 Dec 2013 19:52:50 GMT
James Taylor created HBASE-10256:

             Summary: Handling of value argument being null for checkAndDelete
                 Key: HBASE-10256
                 URL: https://issues.apache.org/jira/browse/HBASE-10256
             Project: HBase
          Issue Type: Improvement
            Reporter: James Taylor

IMO, it would be more useful if when a null is supplied as the value for checkAndDelete, that
it add the Delete marker if the row exists rather than if it doesn't exist (i.e. the opposite
of checkAndPut). I think the most common use case for checkAndDelete is to delete a row if
it exists and tell me that you deleted it. With the current implementation, it adds a Delete
marker only if the row does not exist when you supply a null value which IMO is not very useful.

My workaround is to add another "known" KeyValue to my row with a fixed value and then call
checkAndDelete passing in this known value. Also, FWIW, if an empty byte array is passed through
(a valid value), it treats it the same as if null was passed through, which is another separate

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