[jira] [Assigned] (IGNITE-5850) Introduce an API for baseline topology for persistence-enabled clusters

["Sergey Chugunov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-5850?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Chugunov reassigned IGNITE-5850:
---------------------------------------

    Assignee: Sergey Chugunov

> Introduce an API for baseline topology for persistence-enabled clusters
> -----------------------------------------------------------------------
>
>                 Key: IGNITE-5850
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5850
>             Project: Ignite
>          Issue Type: New Feature
>          Components: persistence
>    Affects Versions: 2.1
>            Reporter: Alexey Goncharuk
>            Assignee: Sergey Chugunov
>              Labels: IEP-4, Phase-1
>             Fix For: 2.4
>
>
> Since the persistence was introduced, we require that cluster be started in an inactive mode and activation happens only manually.
> We need to add a concept of baseline topology which is fixed on the first cluster activation and may be changed later by a user. We need to develop a consistent API facade for this purpose.
> I suggest to make the following changes:
> {code}
> public interface BaselineNode {
>     public Object consistentId();
>     public <T> T attribute(String name);
>     public Map<String, Object> attributes();
> }
> public interface IgniteCluster {
>     // .....
>     @Nullable public Collection<BaselineNode> currentBaselineTopology();
>     public void setBaselineTopology(Collection<BaselineNode> baselineTop);
>     public void setBaselineTopology(long topVer);
>     // ....
> }
> public interface ClusterNode extends BaselineNode {
>     // ....
> }
> {code}
> This is a minimal yet sufficient API change allowing full-fledged baseline topology management both from API and from CLI or UI utilities.
> The topology change would look like so:
> {code}
> IgniteCluster cluster = ignite.cluster();
> Collection<BaselineNode> curTop = cluster.baselineTopology();
> for (ClusterNode node : cluster.topology(cluster.currentTopologyVersion())) {
>     if (shouldAdd(node))
>         curTop.add(node);
> }
> cluster.setBaselineTopology(curTop);
> {code}



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