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292b85b5ef
- drop HintMostRecentCommonAncestor rpc call
- it is wrong to put faith into the active side of the replication to always make that call
(we might not trust it, ref pull setup)
- clean up step holds + step bookmarks + replication cursor bookmarks on
send RPC instead
- this makes it symmetric with Receive RPC
- use a cache (endpoint.sendAbstractionsCache) to avoid the cost of
listing the on-disk endpoint abstractions state on every step
The "create" methods for endpoint abstractions (CreateReplicationCursor, HoldStep) are now fully
idempotent and return an Abstraction.
Notes about endpoint.sendAbstractionsCache:
- fills lazily from disk state on first `Get` operation
- fill from disk is generally only attempted once
- unless the `ListAbstractions` fails, in which case the fill from
disk is retried on next `Get` (the current `Get` will observe a
subset of the actual on-disk abstractions)
- the `Invalidate` method is called
- it is a global (zrepl process-wide) cache
fixes #316
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|---|---|---|
| .. | ||
| batchDestroy.go | ||
| getNonexistent.go | ||
| helpers.go | ||
| idempotentBookmark.go | ||
| idempotentDestroy.go | ||
| idempotentHold.go | ||
| listFilesystems.go | ||
| listFilesystemVersions.go | ||
| replicationCursor.go | ||
| resumableRecvAndTokenHandling.go | ||
| resumeTokenParsing.go | ||
| resumeTokensGenerate.bash | ||
| sendArgsValidation.go | ||
| tests.go | ||
| undestroyableSnapshotParsing.go | ||