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https://issues.apache.org/jira/browse/IGNITE-24892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mirza Aliev updated IGNITE-24892:
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Description:
h3. Motivation
The Strongly Consistent (SC) mode of a zone ensures partitions' data
consistency using the Raft algorithm. However, if a majority of nodes hosting a
partition are lost, the SC partition becomes unavailable.
Due to the guarantees provided by the Raft algorithm, we might assume that in a
two-node scenario, if data has been applied to Raft, it has also been applied
to both nodes. In this case, even if one of the two nodes is lost, restoring
the partition’s availability would not result in data loss. This means that in
a two-node setup, it is possible to recover partition availability in SC mode,
even when the majority is lost.
h3. Definition of Done
* The solution is implemented so that, in a two-node scenario, partition
availability can be recovered without data loss when one majority is lost.
was:
h3. Motivation
The Strongly Consistent (SC) mode of a zone ensures partitions' data
consistency using the Raft algorithm. However, if a majority of nodes hosting a
partition are lost, the SC partition becomes unavailable.
Due to the guarantees provided by the Raft algorithm, we might assume that in a
two-node scenario, if data has been applied to Raft, it has also been applied
to both nodes. In this case, even if one of the two nodes is lost, restoring
the partition’s availability would not result in data loss. This means that in
a two-node setup, it is possible to recover partition availability in SC mode,
even when the majority is lost.
h3. Definition of Done
* The solution is implemented so that, in a two-node scenario, partition
availability can be recovered without data loss.
> Support availability of SC zone when one node left in two-nodes scenario
> ------------------------------------------------------------------------
>
> Key: IGNITE-24892
> URL: https://issues.apache.org/jira/browse/IGNITE-24892
> Project: Ignite
> Issue Type: Improvement
> Reporter: Mirza Aliev
> Priority: Major
> Labels: ignite-3
>
> h3. Motivation
> The Strongly Consistent (SC) mode of a zone ensures partitions' data
> consistency using the Raft algorithm. However, if a majority of nodes hosting
> a partition are lost, the SC partition becomes unavailable.
> Due to the guarantees provided by the Raft algorithm, we might assume that in
> a two-node scenario, if data has been applied to Raft, it has also been
> applied to both nodes. In this case, even if one of the two nodes is lost,
> restoring the partition’s availability would not result in data loss. This
> means that in a two-node setup, it is possible to recover partition
> availability in SC mode, even when the majority is lost.
> h3. Definition of Done
> * The solution is implemented so that, in a two-node scenario, partition
> availability can be recovered without data loss when one majority is lost.
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