[jira] [Commented] (IGNITE-28952) [ducktests] MDC tests for majority based topology validation

["Maksim Davydov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-28952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18113871#comment-18113871 ] 

Maksim Davydov commented on IGNITE-28952:
-----------------------------------------

https://ci2.ignite.apache.org/buildConfiguration/IgniteTests24Java8_CheckCodeStyleDucktests?branch=pull%2F13576%2Fhead#all-projects

> [ducktests] MDC tests for majority based topology validation
> ------------------------------------------------------------
>
>                 Key: IGNITE-28952
>                 URL: https://issues.apache.org/jira/browse/IGNITE-28952
>             Project: Ignite
>          Issue Type: Task
>            Reporter: Maksim Davydov
>            Assignee: Maksim Davydov
>            Priority: Minor
>              Labels: IEP-140, ducktests, ise
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> MdcTopologyValidator has two modes and the number of data centers picks one: with
> an EVEN DC count a segment stays writable while it sees the main DC, with an ODD
> one while it sees a majority of the DC set. The ducktest fixture only ever built a
> two DC cluster, so only the first mode is covered.
> Let MdcCluster span an arbitrary DC set, compile the cache parameters from it, and
> cut several cross-DC links apart in one round-trip. On top of that, three scenarios
> over three DCs: one DC isolated, a three way split, and a DC lost outright.
>     from the two others, parametrized over which DC is isolated; a three way split in which
>     every segment goes read-only; and data centers lost one by one, writable while a majority
>     survives and read-only below it. Every partition owns one copy per DC, so every segment
>     still serves every read - that is what separates the read assertions from the write ones.
>   - Framework unit checks for the DC-count dependent parts: validator mode selection, backup
>     arithmetic, the impairment mesh and its per-pair overrides, and the per-node command
>     compilation of single and multi-link partitions.



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