flush before shutdown so restart is faster
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                 Key: CASSANDRA-3564
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3564
             Project: Cassandra
          Issue Type: New Feature
          Components: Packaging
            Reporter: Jonathan Ellis
            Assignee: paul cannon
            Priority: Minor
             Fix For: 1.1


Cassandra handles flush in its shutdown hook for durable_writes=false CFs 
(otherwise we're *guaranteed* to lose data) but leaves it up to the operator 
otherwise.  I'd rather leave it that way to offer these semantics:

cassandra stop = shutdown nicely
kill -INT = shutdown faster but don't lose any updates
kill -KILL = lose most recent writes unless durable_writes=true and batch 
commits are on

But if it's not reasonable to use nodetool from the init script then I guess we 
can just make the shutdown hook flush everything.

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