Fix Findbugs: Replace keySet w entrySet
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Key: CASSANDRA-611
URL: https://issues.apache.org/jira/browse/CASSANDRA-611
Project: Cassandra
Issue Type: Bug
Reporter: Stu Hood
Attachments: findbugs-keyset-w-entryset.txt
A lot of places in the codebase, we iterate over the keySet() of a Map, and
call get() for each key. For a HashMap, this is still O(N), but when you are
dealing with a SortedMap, this is O(NlogN). The list of occurences are attached.
Fixing this issue should give us a general (minor?) performance boost.
In order to find unused method parameters for CASSANDRA-608, I ran FindBugs
against Cassandra, and found a few interesting issues we ought to explore (but
not the unused method params, oi.)
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