At MongoDB World this week, we announced the big features in our upcoming 3.6 release. I’m a driver developer, so I’ll share the details about the driver improvements that are coming in this version. I’ll cover six new features — the first two are performance improvements with no driver API changes. The next three are related to a new idea, “MongoDB sessions,” and for dessert, we’ll have the new Notification API.
Since 3.4, MongoDB has used wire protocol compression for traffic between servers. This is especially important for secondaries streaming the primary’s oplog: we found that oplog data can be compressed 20x, allowing secondaries to replicate four times faster in certain scenarios. The server uses the Snappy algorithm, which is a good tradeoff between speed and compression.
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