Github user keith-turner commented on the pull request: https://github.com/apache/accumulo/pull/75#issuecomment-189540148 > Leaving at 10 (or some other number) provides back pressure to the client threads adding mutations. I beilieve doing this makes it harder to understand the batch writer from a user perspective. This batch writer already provides back pressure based on memory usage. This constraint would provide back pressure in another way that I would not want to attempt to write up in user facing javadocs.
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