Re:The Internals of PostgreSQL
by erhserhdfd on Thursday February 17, 2022 @10:01AM
(#30373758)
"If you work at Amazon, you cannot use and refer to this document because of the copyright violation issues." --> This is really interesting. Does anyone know the background on this? Has anyone else seen this someplace else?
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sounds like he is pretty pissed at Amazon selling counterfeit versions of some of his 7 books. And he should be.
Re:The Internals of PostgreSQL
by collegeburner on Thursday February 17, 2022 @12:21PM
(#30375850)
Maybe to do with amazon implementing postgres compatibility in aurora? Reading this could leave an argument that it's not a "clean-room" implementation and is a license violation.
Re:The Internals of PostgreSQL
by paulryanrogers on Thursday February 17, 2022 @01:51PM
(#30377026)
Pg's license is like BSD/MIT. So long as they provide attribution why would they bother trying to do a clean room reimplementation?
You might be confusing what a license agreement is vs what copyright assignment is.
doesn't sound like it.
Aurora isn’t a reimplementation anyway, it’s a fork with the storage layer replaced.
Depending on the database, changing the storage layer might require changing almost everything: the query planner, optimizer and executioner intrinsically need to know how storage works to make queries efficient.
Aurora most definitely does not do that for Postgres. Postgres’s storage layer is separate enough that this is quite possible.
Edit: maybe the confusion here is about what “storage layer” means here. The physical row encoding is still the same. What’s different in Aurora (there are white papers on this) is how the WAL records get applied directly to encoding aware distributed as opposed to separately syncing the heap storage to disk.