Hi, At the end of the handshake for replication, a CopyOutResponse message might not arrive at the standby for a while if there is no WAL record to send. Also walreceiver would get stuck until that message has arrived. This is not a big problem, but should be fixed.
The cause is that walsender hasn't called pq_flush() there. The attached patch changes walsender so as to call pg_flush() immediately when sending that message. Is it worth applying the patch? Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center
walsender_pg_flush_v1.patch
Description: Binary data
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