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* 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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