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Add LSN and Backpressure descriptions to glossary.md

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anastasia
2022-01-21 15:42:44 +03:00
committed by lubennikovaav
parent 7bc1274a03
commit 81e94d1897
2 changed files with 41 additions and 4 deletions
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walkeeper/README
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@@ -99,10 +99,7 @@ A: If the compute node has evicted a page, changes to it have been WAL-logged
Q: How long may Page Server wait for?
A: Not too long, hopefully. If a page is evicted, it probably was not used for
a while, so the WAL service have had enough time to push changes to the Page
Server. There may be issues if there is no backpressure and compute node with
WAL service run ahead of Page Server, though.
There is no backpressure right now, so you may even see some spurious
timeouts in tests.
Server. To limit the lag, tune backpressure using `max_replication_*_lag` settings.
Q: How do WAL safekeepers communicate with each other?
A: They may only send each other messages via the compute node, they never