A data store with readReplicas becomes a replicated store. Writes,
operator-written SQL and everything outside a read scope go to the
primary. JMAP reads before a request's first write, IMAP LIST, STATUS,
SEARCH, SORT and FETCH, POP3 RETR and TOP, DAV GET, PROPFIND and REPORT,
and blob downloads run in a read scope. Only account data (properties,
indexes, change logs, counters, ACLs, blobs, the search index) is read
from a replica; the registry, in-memory values, the task queue and the
rest stay on the primary.
In a scope, the first read picks a replica round-robin among those up
and under the lag limit, and only if it has every change this node has
written or heard of for the scope's accounts: marks come from write
results, the cluster's state-change broadcasts, a sinceState the client
presents, and, with more than one node, Redis. A write inside the scope
sends the rest of it to the primary. A miss on a replica is looked up on
the primary, and a replica error retries the read there and marks the
replica down.
Each node samples lag every second (WAL positions on PostgreSQL; GTID
sets or Seconds_Behind_Source on MySQL), stops reading from a replica
over 5 s and starts again under 2.5 s, and probes a down replica every
10 s. At startup a replica is left out if it's the primary, isn't
read-only, applies out of commit order, or doesn't show a marker written
to the primary within six tries.
replica_tests (postgres, STORE=PostgreSqlReplicated) runs a primary and a
streaming hot standby in containers: tests 9, 10, 12, 13, 14 and 15 pass.
One branding module (types::brand!) supplies the name to every protocol
greeting, the HTTP realm, the startup banner, Received headers, the
user agent, the IMAP ID response and calendar PRODIDs. The sign-in and
calendar pages take ihasmail's palette and font and the INBUXA logo, and
calendar emails embed the INBUXA lockup. Default calendar and address book
names follow. Protocol identifiers (urn:stalwart:jmap, vnd.stalwart Sieve
extensions) and upstream copyright notices are unchanged.
Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 117 in 50 files
Dangling module declarations removed: 5
Cargo edits turning enterprise off: 14
Verification: clean
Enterprise feature gates left for rebuilt features: 19 in 18 files
Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.
jcoffey-dev