mirror of
https://github.com/zrepl/zrepl.git
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30cdc1430e
This commit
- adds a configuration in which no step holds, replication cursors, etc. are created
- removes the send.step_holds.disable_incremental setting
- creates a new config option `replication` for active-side jobs
- adds the replication.protection.{initial,incremental} settings, each
of which can have values
- `guarantee_resumability`
- `guarantee_incremental`
- `guarantee_nothing`
(refer to docs/configuration/replication.rst for semantics)
The `replication` config from an active side is sent to both endpoint.Sender and endpoint.Receiver
for each replication step. Sender and Receiver then act accordingly.
For `guarantee_incremental`, we add the new `tentative-replication-cursor` abstraction.
The necessity for that abstraction is outlined in https://github.com/zrepl/zrepl/issues/340.
fixes https://github.com/zrepl/zrepl/issues/340
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
package endpoint
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import (
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"context"
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"fmt"
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"regexp"
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"github.com/pkg/errors"
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"github.com/zrepl/zrepl/zfs"
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)
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const (
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LastReceivedHoldTagNamePrefix = "zrepl_last_received_J_"
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)
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var lastReceivedHoldTagRE = regexp.MustCompile("^zrepl_last_received_J_(.+)$")
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var _ HoldExtractor = LastReceivedHoldExtractor
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func LastReceivedHoldExtractor(fs *zfs.DatasetPath, v zfs.FilesystemVersion, holdTag string) Abstraction {
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var err error
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if v.Type != zfs.Snapshot {
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panic("impl error")
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}
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jobID, err := ParseLastReceivedHoldTag(holdTag)
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if err == nil {
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return &holdBasedAbstraction{
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Type: AbstractionLastReceivedHold,
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FS: fs.ToString(),
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FilesystemVersion: v,
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Tag: holdTag,
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JobID: jobID,
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}
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}
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return nil
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}
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// err != nil always means that the bookmark is not a step bookmark
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func ParseLastReceivedHoldTag(tag string) (JobID, error) {
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match := lastReceivedHoldTagRE.FindStringSubmatch(tag)
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if match == nil {
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return JobID{}, errors.Errorf("parse last-received-hold tag: does not match regex %s", lastReceivedHoldTagRE.String())
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}
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jobId, err := MakeJobID(match[1])
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if err != nil {
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return JobID{}, errors.Wrap(err, "parse last-received-hold tag: invalid job id field")
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}
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return jobId, nil
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}
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func LastReceivedHoldTag(jobID JobID) (string, error) {
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return lastReceivedHoldImpl(jobID.String())
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}
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func lastReceivedHoldImpl(jobid string) (string, error) {
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tag := fmt.Sprintf("%s%s", LastReceivedHoldTagNamePrefix, jobid)
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if err := zfs.ValidHoldTag(tag); err != nil {
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return "", err
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}
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return tag, nil
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}
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func CreateLastReceivedHold(ctx context.Context, fs string, to zfs.FilesystemVersion, jobID JobID) (Abstraction, error) {
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if !to.IsSnapshot() {
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return nil, errors.Errorf("last-received-hold: target must be a snapshot: %s", to.FullPath(fs))
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}
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tag, err := LastReceivedHoldTag(jobID)
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if err != nil {
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return nil, errors.Wrap(err, "last-received-hold: hold tag")
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}
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// we never want to be without a hold
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// => hold new one before releasing old hold
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err = zfs.ZFSHold(ctx, fs, to, tag)
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if err != nil {
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return nil, errors.Wrap(err, "last-received-hold: hold newly received")
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}
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return &holdBasedAbstraction{
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Type: AbstractionLastReceivedHold,
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FS: fs,
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FilesystemVersion: to,
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JobID: jobID,
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Tag: tag,
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}, nil
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}
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