Github user ctubbsii commented on the issue:
https://github.com/apache/accumulo/pull/250
@joshelser It's poorly worded. It's not arbitrary system metadata. It's
"accumulo system"-wide configuration for pluggable components. Currently, we
have a prefix for arbitrary "per-table" configuration, but that's no good for
things like volume choosers, pluggable security configuration options, etc.
Having this allows pluggable components to be configurable, without
changing code, or requiring pluggable components use their own configuration
system.
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