replication + endpoint: replication guarantees: guarantee_{resumability,incremental,nothing}

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

This commit is contained in:

Christian Schwarz

2020-06-27 23:53:33 +02:00

parent 27673a23e9

commit 30cdc1430e

36 changed files with 1503 additions and 757 deletions

									
										docs/configuration.rst
									
		+1
		
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				@@ -12,6 +12,7 @@ Configuration

				    configuration/transports

				    configuration/filter_syntax

				    configuration/sendrecvoptions

				    configuration/replication

				    configuration/snapshotting

				    configuration/prune

				    configuration/logging