Even though this method of failover slot tends to make life easy for just about all of the scenarios, right now there were some notable arguments because a lot considerably more problems around it likewise needed to be tackled. Ideally, there should end up being a way to indicate if the slot is a new “failover slot” so of which the corresponding information will probably be written to WAL. Nevertheless every standby which obtains the WALs including typically the cascaded replicas will generate and maintain slots. This specific will result in unwanted overhead and WAL preservation, maintaining old visions associated with system catalog, etc. The particular historical PostgreSQL community conversation thread is available right here.
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Once typically the same slot is accessible in newly promoted major, the logical subscriber could just alter the registration into a new master. That would are actually better when promoting the standby when PostgreSQL detects โปรโมชั่นสล็อต the brand-new slot copied through the major. But the slot will stay invisible until the subsequent restart of the PostgreSQL instance. A restart regarding the instance may help PostgreSQL to detect the slot machine game.
Since logical solving is not supported about the physical standby aspect, the client/subscriber cannot generate a logical replication slot machine game on the standby, in addition to standby has no accessibility to progress the slot. Also if the slot is usually made possible in actual physical standby, downstream subscribers could hook up to it. The life does not have provision to maintain the catalog xmin about its primary by ending it from cleaning that up.
Assume of which we cut down typically the requirement to have typically the standby as a rational replication publisher. Then, when there is an approach in which slot state could be copied from typically the master to the imitation, ideally the basic failover works well. A slot express valid on the major side with a WAL LSN is valid on typically the standby side also since the physical standby is surely an exact binary copy in the primary.
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Since we are merely copying the file minus the notice of the PostgreSQL processes, it won’t end up being available until PostgreSQL re-reads the data directory. In addition to no slot information as well available on the standby aspect. Ideally, one should assume everything persisted in typically the data directory of the principal side to be current in your data directory regarding physical standby. When that comes to the circumstance of the replication slot machine game, it won’t be around about the physical standby aspect. As we can notice, there is a listing with the name regarding the replication slot brand “sub” and also a file together with the name “state” which often holds the replication express information. This information is usually presented to the customer if they query on pg_replication_slots. PostgreSQL persists the express of the replication slot machine game information in pg_replslot subdirectory within the data listing of the publisher.