Is it still the case (4.0, 4.1) where adding the table param changes the schema hash (including in the mixed mode during the first deploy), or is that a solved problem in 4.0+?
> On Dec 2, 2025, at 2:54 PM, Brandon Williams <[email protected]> wrote: > > Maybe I was too hasty with my vote, then. I know from experience that > once table params or new system table properties are added, rolling > back is generally not possible. That can perhaps be fixed in some way > but nothing currently exists. > > Kind Regards, > Brandon > > On Tue, Dec 2, 2025 at 1:49 PM C. Scott Andreas <[email protected]> wrote: >> >> The patch will need vetting for compatibility implications of upgrades from >> (e.g.,) 4.0 + CEP-37 to newer-versioned releases like Apache Cassandra 5.0.6 >> that don't have this change. >> >> Some sources of potential incompatibility (briefly scanned, not vetted) look >> like: >> >> – Table params: >> https://github.com/apache/cassandra/commit/6753fb49dcba6af6cccc02e62a5d425704d45b20#diff-44546e8ca2f2a8a986ec2b16f837b7526f2444e5fb2c6367abf35d8756fd0e51R578-R631 >> – system_distributed generation bump: >> https://github.com/apache/cassandra/commit/6753fb49dcba6af6cccc02e62a5d425704d45b20#diff-68edc51628c3cf6a0e9dbcff0dd697e130b952e0f328699db5541a21300aa0b2R89-R104 >> – System table: >> https://github.com/apache/cassandra/commit/6753fb49dcba6af6cccc02e62a5d425704d45b20#diff-68edc51628c3cf6a0e9dbcff0dd697e130b952e0f328699db5541a21300aa0b2R166 >> >> >> On Dec 2, 2025, at 11:36 AM, Josh McKenzie <[email protected]> wrote: >> >> >> In a couple prior discuss threads, the topic of backporting in-project >> repair scheduling (CEP-37) came up a few times and the consensus seemed to >> be that everyone was receptive to us backporting this feature to all GA >> branches. The goal of this thread is to focus on that and formalize >> discussion and consensus before a potential vote. >> >> Here's a link to the CEP-37: >> https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-37%3A+Apache+Cassandra+Unified+Repair+Solution >> >> And a link to the JIRA for the impl: >> https://issues.apache.org/jira/browse/CASSANDRA-19918 >> >> And here's the PR: >> https://github.com/apache/cassandra/commit/6753fb49dcba6af6cccc02e62a5d425704d45b20 >> >> So: what do we think? >> >> I'm personally +1 on allowing this to be backported to 4.0, 4.1, and 5.0. >> >> ----- >> Prior reading: >> - Discussing potential of a backport branch: >> https://lists.apache.org/thread/xbxt21rttsqvhmh8ds9vs2cr7fx27w3k >> - Discussing understanding fork motivations: >> https://lists.apache.org/thread/5nv1f4bng4nw5ofgh135k5pf2f6l6lgl >> >>
