[
https://issues.apache.org/jira/browse/IGNITE-24067?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vadim Kolodin reassigned IGNITE-24067:
--------------------------------------
Assignee: Denis Chudov
> Adjust placement driver for the usage of learners
> -------------------------------------------------
>
> Key: IGNITE-24067
> URL: https://issues.apache.org/jira/browse/IGNITE-24067
> Project: Ignite
> Issue Type: Improvement
> Reporter: Denis Chudov
> Assignee: Denis Chudov
> Priority: Major
> Labels: ignite-3
> Time Spent: 10m
> Remaining Estimate: 0h
>
> *Motivation*
> Assignments placement driver provides the assignments that it gets from the
> meta storage. So, since the learners will be included into the assignments
> that are written to the meta storage, no additional changes of assignment
> placement driver are required.
> Lease placement driver, however, {*}should be adjusted{*}: primary replica
> should be colocated with consensus group, so the lease placement driver
> should filter the assignments to get only peers before choosing the lease
> candidate.
> Also, if it's impossible to choose a primary replica from stable assignments,
> it should be chosen from the first element of the pending assignment queue.
> *Definition of done*
> * primary replicas are located only on consensus replicas, not learners;
> * if it is impossible to select a primary replica from stable assignments,
> the first element of pending assignments queue should be used.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
