When configuring Bazel Buildfarm, setting actionCacheExpire to be less than casExpire is more reasonable ?

[duanguoxue]

https://meroton.com/blog/bazel-6-errors-build-without-the-bytes/

[werkt]

tl;dr: No, this will not improve behavior

casExpire only affects redis key definitions, and has little to do with the expected time that a blob is actually expired and removed from the system.

The default config setting is now (as of #1822) to issue a findMissingBlobs request, which, also by default, will not concern itself with the redis definition, and if a blob is requested from that set later for read, the server will assume best intent and locate+adjust the redis registrations for the blob, even if the casExpire has triggered removal of the worker set.