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d3e9dce296
Summary: We've hit an issue of slow pushes to Mononoke when a commit modifies a lot of files (>500 in our case). turned out that the problem was in the fact that we have only one master write connection open, and each blobstore write requires a write to mysql because of multiplexed blobstore. Because we have only one connection open all our mysql writes are serialized, and the push is taking too much time. It's especially bad in non-master regions. To mitigate the issue let's add a batching in the blobstore sync queue. When clients call `blobstore_sync_queue.add(...)` we'll send this new entry via the channel to a separate task that would send writes in batches. That allows us to increase throughput significantly. Reviewed By: jsgf Differential Revision: D15248288 fbshipit-source-id: 22bab284b0cbe552b4b51bab4027813b4278fd14 |
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