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add an explicit threadpool argument to ConnectionPool initializer

1

_exarkun@…_ originally submitted this as _[ticket:835](https://trac.calendarserver.org/ticket/835)_ --- `ConnectionPool` has a `reactor` (class) attribute that initializes to the global reactor. It uses this for `IReactorThreads` (to thread the actual SQL execution)...

it is hard to track down the cause of "ConnectionError: txn created while DB pool shutting down" errors

1

_exarkun@…_ originally submitted this as _[ticket:836](https://trac.calendarserver.org/ticket/836)_ --- This error happens when `ConnectionPool.connection` is called after `ConnectionPool.stopService` is called. No new connections are allowed when the pool is stopping (or stopped)....

ConnectionPool.connection grabs a thread even if the ConnectionPool hasn't been started yet

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_exarkun@…_ originally submitted this as _[ticket:840](https://trac.calendarserver.org/ticket/840)_ --- This example hangs indefinitely: ``` from twext.enterprise.adbapi2 import ConnectionPool from twisted.internet import reactor def connect(*args, **kw): raise NotImplementedError() pool = ConnectionPool(connect) connection =...

Twext attempts to bind to IPv6 address and fails

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_jroweboy@…_ originally submitted this as _[ticket:812](https://trac.calendarserver.org/ticket/812)_ - **Owner:** @glyph --- Note: this is a bug that was previously discussed on the calendar server users list at https://lists.macosforge.org/pipermail/calendarserver-users/2013-July/002266.html When installing Calendar...