Exception chaining#19
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… a query in the db server, and therefore failing to cancel the original query
…se operations, not on queued operations.
…rmittently. Timer.purge() is linear in the number of TimerTasks, and is synchronized on the Timer's monitor, so calling purge() for every task was effectively quadratic. This can get bad if load causes many taks to get backed up on the Timer.
…eue intermittently." On further inspection, we don't need to call purge() at all. We'll revert this, and remove the call to purge in a future change. This reverts commit 576bda7.
…run their timeout. We were calling it for every task, and it's linear in the number of tasks, and synchronized on the timer's monitor, so it was effectively quadratic on the number of pending tasks. It turns out that we don't need to call purge() at all anyway...
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This change is specifically to address the issue of exception chaining in SqlQuery. The fix passes the original exception along as a cause.
Added spec to test that the underlying cause is indeed propagated.