Mdb 17 11 wal flusher - #109
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reshke wants to merge 6 commits into
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The walreceiver receives, writes and fsyncs in one loop, and recovery may not touch a byte until it is durable, so replay is serialized behind the fsync. Read up to what has been written instead, and keep the write-ahead rule where the primary keeps it: a page modified by a replayed record is held back from disk, and pg_control is held back from recording progress, until the WAL behind it is on disk. Cuts median replay lag by 63% on pgbench at a fixed 10k tps.
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