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Have replication clients remove _INT_STREAM_POS (#15309)
* Have replication clients remove _INT_STREAM_POS Suppose worker A makes an internal http request from worker B. B may make changes that A later learns about over replication. We want A's request to block until it has seen those changes—mainly to ensure A's caches are invalidated promptly. This helps provide read-after-write consistency, eliminating entire categories of races and test flakes. To implement this, B includes a top-level field `_INT_STREAM_POS` in its response JSON. Roughly speaking, the field's value tells A what to wait for. But we weren't removing that internal field before A's request completed! Introduced in https://github.com/matrix-org/synapse/pull/14820. Fixes #15308. * Changelog
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changelog.d/15309.bugfix
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changelog.d/15309.bugfix
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Fix a bug introduced in Synapse 1.76.0 where responses from worker deployments could include an internal `_INT_STREAM_POS` key.
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@ -345,7 +345,7 @@ class ReplicationEndpoint(metaclass=abc.ABCMeta):
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_outgoing_request_counter.labels(cls.NAME, 200).inc()
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# Wait on any streams that the remote may have written to.
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for stream_name, position in result.get(
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for stream_name, position in result.pop(
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_STREAM_POSITION_KEY, {}
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).items():
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await replication.wait_for_stream_position(
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