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endpoint: refactor, fix stale holds on initial replication, holds release subcmds

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- endpoint abstractions now share an interface `Abstraction`
- pkg endpoint now has a query facitilty (`ListAbstractions`) which is
  used to find on-disk
    - step holds and bookmarks
    - replication cursors (v1, v2)
    - last-received-holds
- the `zrepl holds list` command consumes endpoint.ListAbstractions
- the new `zrepl holds release-{all,stale}` commands can be used
  to remove abstractions of package endpoint

Co-authored-by: InsanePrawn <insane.prawny@gmail.com>

supersedes #282
fixes #280
fixes #278
This commit is contained in:
Christian Schwarz
2020-03-26 23:43:17 +01:00
parent 44bd354eae
commit f3734ed0d4
28 changed files with 1854 additions and 1168 deletions
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docs/configuration/overview.rst
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@@ -120,7 +120,7 @@ The following steps take place during replication and can be monitored using the
* Perform replication steps in the following order:
Among all filesystems with pending replication steps, pick the filesystem whose next replication step's snapshot is the oldest.
* Create placeholder filesystems on the receiving side to mirror the dataset paths on the sender to ``root_fs/${client_identity}``.
* Acquire send-side step-holds on the step's `from` and `to` snapshots.
* Acquire send-side *step-holds* on the step's `from` and `to` snapshots.
* Perform the replication step.
* Move the **replication cursor** bookmark on the sending side (see below).
* Move the **last-received-hold** on the receiving side (see below).