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synapse-product/changelog.d/9770.bugfix

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Fix sharded federation sender sometimes using 100% CPU. We pull all destinations requiring catchup from the DB in batches. However, if all those destinations get filtered out (due to the federation sender being sharded), then the `last_processed` destination doesn't get updated, and we keep requesting the same set repeatedly.
2021-04-08 12:30:01 -04:00
Fix bug where sharded federation senders could get stuck repeatedly querying the DB in a loop, using lots of CPU.
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