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If pg_xlog_replay_pause() is used or max_standby_streaming_delay is set, are unapplied WAL segments stored on the hot standby?

I'd like to be clear if a long-running query is keeping WAL segments from being applied & the primary server fails if the hot standby will still be able to replay segments to come close to the primary's state just before failure or if the changes on the primary server from the beginning of the long-running query will be lost.

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  • Take a look at pg_stat_replication, in particular sent_location, write_location and flush_location Commented May 20, 2015 at 2:06

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