Github user michaelarusso commented on the pull request:
https://github.com/apache/usergrid/pull/433#issuecomment-154932204
This happens synchronous to the write commit, adding more write ops to the
path when ... since it's not used anywhere now, looks we need to get it in to
prevent wide rows in that CF. However, we should spend time in master to see
if we can make this an async event for deleting old versions of a unique value.
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