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[DOCS] Document CCR compatibility requirements (#49776) 

* Creates a prerequisites section in the cross-cluster replication (CCR)
  overview.
* Adds concise definitions for local and remote cluster in a CCR context.
* Documents that the ES version of the local cluster must be the same
  or a newer compatible version as the remote cluster.
This commit is contained in:
James Rodewig 2019-12-02 15:52:13 -05:00
parent ebc13ca498
commit f1fd41cb53
2 changed files with 14 additions and 1 deletions
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13
docs/reference/ccr/overview.asciidoc
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@ -17,7 +17,18 @@ Replication is pull-based. This means that replication is driven by the
follower index. This simplifies state management on the leader index and means
that {ccr} does not interfere with indexing on the leader index.
IMPORTANT: {ccr-cap} requires <<modules-remote-clusters, remote clusters>>.
In {ccr}, the cluster performing this pull is known as the _local cluster_. The
cluster being replicated is known as the _remote cluster_.
==== Prerequisites
* {ccr-cap} requires <<modules-remote-clusters, remote clusters>>.
* The {es} version of the local cluster must be **the same as or newer** than
the remote cluster. If newer, the versions must also be compatible as outlined
in the following matrix.
include::../modules/remote-clusters.asciidoc[tag=remote-cluster-compatibility-matrix]
==== Configuring replication

2
docs/reference/modules/remote-clusters.asciidoc
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@ -43,6 +43,7 @@ node, while 6.7 can only communicate with 7.0. Version compatibility is
symmetric, meaning that if 6.7 can communicate with 7.0, 7.0 can also
communicate with 6.7. The matrix below summarizes compatibility as described above.
// tag::remote-cluster-compatibility-matrix[]
[cols="^,^,^,^,^,^,^,^"]
|====
| Compatibility | 5.0->5.5 | 5.6 | 6.0->6.6 | 6.7 | 6.8 | 7.0 | 7.1->7.x
@ -54,6 +55,7 @@ communicate with 6.7. The matrix below summarizes compatibility as described abo
| 7.0 | No | No | No | Yes | Yes | Yes | Yes
| 7.1->7.x | No | No | No | No | Yes | Yes | Yes
|====
// end::remote-cluster-compatibility-matrix[]
- *role*: Dedicated master nodes never get selected.
- *attributes*: You can tag which nodes should be selected