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Remove FIXME tag from abstract adapter test.
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The core of this fix is a threadsafe, fair Queue class. It is
very similar to Queue in stdlib except that it supports waiting
with a timeout.
The issue this solves is that if several threads are contending for
database connections, an unfair queue makes is possible that a thread
will timeout even while other threads successfully acquire and release
connections. A fair queue means the thread that has been waiting the
longest will get the next available connection.
This includes a few test fixes to avoid test ordering issues that
cropped up during development of this patch.
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This reverts commit d2901f0fc4270a765717ad572d559dc49a56b3a8, reversing
changes made to 525839fdd8cc34d6d524f204528d5b6f36fe410c.
Conflicts:
activerecord/test/cases/connection_pool_test.rb
Reason: This change broke the build (http://travis-ci.org/#!/rails/rails/builds/1391490)
and we don't have any solution until now. I asked the author to try to
fix it and open a new pull request.
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This is the 'top level' connection, inherited by any models that include
ActiveRecord::Model or inherit from ActiveRecord::Base.
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pool.
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