Github user busbey commented on the pull request:
https://github.com/apache/nifi/pull/83#issuecomment-150367325
The problem with keeping client libraries up to date is that often times
they don't work with older servers. YCSB hits this pretty hard for Cassandra,
ElasticSearch, and HBase. The only real solution is something like NIFI-710.
For the specific case of Hadoop, I'd look to see if the project makes any
promises about newer clients talking to older servers. Absent that, I would
presume we shouldn't update the client without a big notice to downstream
users. Despite that, the Hadoop 2.6.0 client library is particularly bad so if
we could update to 2.6.1 in the short term, that'd be good.
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