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When we have broken transaction data in the database (such as from mongo getting OOM killed), it can cause cascade failure, where that document ends up getting too many transactions queued up against it. This can also happen if you have nothing but assert-only transactions against a single document. If we have lots of transactions, it becomes harder and harder to add new entries and clearing out a large queue is O(N^2) which means capping it is worthwhile. (It also makes the document grow until it hits max-doc-size.) The upper bound is still quite large, so it should not be triggered if everything is operating normally.
Still defaults to 1000 without any other configuration, but allows callers to know that they can be stricter/less strict.
…fix/jameinel-max-txn-queue-length
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szank
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…txn-queue-length Bound TXN queue lengths
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Fix busy socket reuse and kill iterator from another connection
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See go-mgo#463.
Provides an opt-in failsafe upper bound to the length of the transaction queue. More thanks to @jameinel again for the hard work.