use oplog as op buffer on secondaries

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    • Repl 2016-08-29
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      Currently, we use an in-memory queue to buffer operations between the network reader and the op writer. Instead, we could simply use the local.oplog collection as the buffer.

      Added advantage: we'll know what operations in the batch were actively being applied if we crash in the middle of a batch.

            Assignee:
            Mathias Stearn
            Reporter:
            Eric Milkie
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