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b5a8018116
Previously, when pg_recvlogical exited due to SIGINT or SIGTERM, it could terminate without sending final feedback for the last decoded changes it had already written locally. So, if pg_recvlogical was restarted afterwards, the server-side logical replication slot could still point behind those changes, causing them to be sent again. Make pg_recvlogical send final feedback once more during SIGINT/SIGTERM shutdown, before sending CopyDone. This gives the server one more chance to advance the slot far enough to avoid resending already-written data, so users are less likely to see duplicate decoded output after stopping and restarting pg_recvlogical. This remains a best-effort improvement rather than a guarantee. Depending on when the signal arrives, pg_recvlogical can already have written decoded output that the server cannot yet safely treat as confirmed, so a later restart can still receive duplicate data. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com> Discussion: https://postgr.es/m/CAHGQGwE83z9O=X7ADMsSa3e1EuP3_GgqHjFt5SmPDNxZo_wgJA@mail.gmail.com |
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