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Posted to issues@ignite.apache.org by "Mirza Aliev (Jira)" <ji...@apache.org> on 2024/12/19 08:50:00 UTC
[jira] [Assigned] (IGNITE-23572) Change rebalance scheduling when data nodes are changed
[ https://issues.apache.org/jira/browse/IGNITE-23572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mirza Aliev reassigned IGNITE-23572:
------------------------------------
Assignee: Kirill Sizov (was: Mirza Aliev)
> Change rebalance scheduling when data nodes are changed
> -------------------------------------------------------
>
> Key: IGNITE-23572
> URL: https://issues.apache.org/jira/browse/IGNITE-23572
> Project: Ignite
> Issue Type: Improvement
> Reporter: Mirza Aliev
> Assignee: Kirill Sizov
> Priority: Major
> Labels: ignite-3
>
> h3. Motivation
> [IEP-131|https://cwiki.apache.org/confluence/display/IGNITE/IEP-131%3A+Partition+Majority+Unavailability+Handling]
>
> In HA mode for scale up situations:
> # Let’s say we have [A, B, C] for the partition assignments, B and C left.
> # Raft group was narrowed in force manner to [A], and after that node B returned, we must enhance stable to [A, B]
> # In terms of DZ.scale up, there wasn't any change in DZ.scale up time window, so data nodes will be the same, so it could mean that we don’t need to schedule new rebalance to enhance stable assignment to [A, B], but we actually do need. (Note that DZ.scale down timer is quite big and wasn’t event passed)
> Proposed enhancements
> # Data nodes are rewritten on scale up even if they are the same
> # When we decide if we need to trigger rebalance after data nodes change, we calculate assignments and apply nodes aliveness check filter to those assignments. If we see that the actual stablePartAssignmentsKey differs from the filtered one, we schedule rebalance.
> # In our example, calculated assignments will be [A, B, C], we will filter them to [A,B] and schedule new rebalance to enhance stablePartAssignmentsKey
> We need to investigate, if this approach must be improved in SC mode as well, or must be done only in HA mode
> h3. Definition of done
> * After resolving this task, we must understand if the proposed approach must be improved in SC mode as well, or must be done only in HA mode
> * Corresponding approach must be implemented.
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