gholt a1a4d35362 Logging improvements: handoffs and thread locals
A warning log line is emitted whenever the proxy has to use a handoff
node. Monitoring these warnings can indicate a problem within your
cluster; however, you can disable these log lines by setting the
proxy conf's log_handoffs to false.

While working on this, I also noticed why many proxy log lines did
not have txn_id and client_ip -- subcoroutines. Now the logger thread
locals are copied to the subcoroutines.

Change-Id: Ibac086e1b985f566c068d083620287509de35da8
2012-07-30 00:50:13 +00:00
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