[
https://issues.apache.org/jira/browse/IGNITE-17394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17577814#comment-17577814
]
Mirza Aliev commented on IGNITE-17394:
--------------------------------------
Hello [~isapego]! We have discussed this requirements and come with the
following:
* We can add a method {{List<String> assignments(UUID tableId)}}, which can
return you a list where on the i-th place resides a node id that considered as
a leader for the i-th partition on the moment of invocation for the provided
tableId.
* As for the second request with discovering distribution changes, we propose
a bit different solution: any api method will throw Transactional Exception
after new transaction mechanism will be introduced before beta release. In case
of changing primary replica (this is new abstraction, that encapsulates the
conception of leaders), any api method will throw Replica Miss Exception (or it
will be a cause of a Transaction Exception). When you handle such kind of
exception, you can just re-call previously introduced api method {{List<String>
assignments(UUID tableId)}} and refresh your partition mapping with actual
primary replicas. This is a ticket when concept of Replica Miss Exception will
be introduced https://issues.apache.org/jira/browse/IGNITE-17378
> Implement API for getting partition mapping
> -------------------------------------------
>
> Key: IGNITE-17394
> URL: https://issues.apache.org/jira/browse/IGNITE-17394
> Project: Ignite
> Issue Type: New Feature
> Affects Versions: 3.0.0-alpha5
> Reporter: Igor Sapego
> Assignee: Mirza Aliev
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0.0-alpha6
>
>
> To implement Partition Awareness feature for clients, we need an internal or
> public API that will provide us with the following mapping: [partition =>
> node id] (or [node id => partitions]).
> We also need a lightweight mechanism that will allow us to discover that this
> distribution has changed. In 2.x we used a topology version for this purpose,
> assuming that if topology version has changed, partition distribution should
> be refreshed.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
