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https://issues.apache.org/jira/browse/IGNITE-17394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17577814#comment-17577814
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Mirza Aliev edited comment on IGNITE-17394 at 8/10/22 9:29 AM:
---------------------------------------------------------------
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: it will be possible that 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
where concept of Replica Miss Exception will be introduced
https://issues.apache.org/jira/browse/IGNITE-17378
was (Author: maliev):
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: it will be possible that 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.
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