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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
76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
package tests
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import (
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"fmt"
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"log"
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"github.com/zrepl/zrepl/platformtest"
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"github.com/zrepl/zrepl/zfs"
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)
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func IdempotentDestroy(ctx *platformtest.Context) {
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platformtest.Run(ctx, platformtest.PanicErr, ctx.RootDataset, `
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DESTROYROOT
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CREATEROOT
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+ "foo bar"
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+ "foo bar@a snap"
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`)
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fs := fmt.Sprintf("%s/foo bar", ctx.RootDataset)
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asnap := fsversion(ctx, fs, "@a snap")
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_, err := zfs.ZFSBookmark(ctx, fs, asnap, "a bookmark")
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if err != nil {
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panic(err)
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}
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type testCase struct {
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description, path string
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}
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cases := []testCase{
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{"snapshot", fmt.Sprintf("%s@a snap", fs)},
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{"bookmark", fmt.Sprintf("%s#a bookmark", fs)},
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{"filesystem", fs},
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}
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for i := range cases {
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func() {
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c := cases[i]
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log.Printf("SUBBEGIN testing idempotent destroy %q for path %q", c.description, c.path)
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log.Println("destroy existing")
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err = zfs.ZFSDestroy(ctx, c.path)
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if err != nil {
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panic(err)
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}
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log.Println("destroy again, non-idempotently, must error")
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err = zfs.ZFSDestroy(ctx, c.path)
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if _, ok := err.(*zfs.DatasetDoesNotExist); !ok {
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panic(fmt.Sprintf("%T: %s", err, err))
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}
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log.Println("destroy again, idempotently, must not error")
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err = zfs.ZFSDestroyIdempotent(ctx, c.path)
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if err != nil {
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panic(err)
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}
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log.Println("SUBEND")
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}()
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}
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// also test idempotent destroy for cases where the parent dataset does not exist
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err = zfs.ZFSDestroyIdempotent(ctx, fmt.Sprintf("%s/not foo bar@nonexistent snapshot", ctx.RootDataset))
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if err != nil {
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panic(err)
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}
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err = zfs.ZFSDestroyIdempotent(ctx, fmt.Sprintf("%s/not foo bar#nonexistent bookmark", ctx.RootDataset))
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if err != nil {
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panic(err)
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}
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}
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