Github user keith-turner commented on the issue:
https://github.com/apache/accumulo/pull/180
I have been thinking about the case of a buggy summarizer and the
possibility of adding an explicit version numbers to serializers. I decided
that it adds a lot of complications and there is an easier way for users to
handle it. Assume I discover that `ExampleSummarizer` is generating data for
`deletes` incorrectly. A simple way to handle this is to push out a new
version of the code that generates a new key like `deletes.v2` and merge
`deletes` and `deletes.v2` separately.
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