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By mitchp
via ruby.dzone.com
Published: Dec 28 2011 / 10:23

We rolled back to 1.3.1 and were running fine in production for a long time. On Friday, we started seeing intermittent deadlock: recursive locking errors from the driver and our site was struggling to stay up. Very quickly the error rate rendered it unusable. A Google search yielded Mongo Ruby driver bug RUBY-274, describing the exact error, which pointed a Ruby 1.9.2 threading issue #4266, explained in this blog post.
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