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https://issues.apache.org/jira/browse/IGNITE-22067?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Denis Chudov updated IGNITE-22067:
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Description:
*Motivation*
Currently, if we have a cluster of 3 nodes and a zone of 5 partitions, there is
relatively high chance that some node will have no primary replica for any
partition located on it.
For 10 partition this chance is much lower but still exists.
It shows that LeaseUpdater#nextLeaseHolder provides distribution far from even.
*Definition of done*
Initial lease distribution has to be made decently even. However, it can be not
preserved during the lifetime of the cluster, because leases don't have to be
moved every time when the topology changes.
*Implementation notes*
We can make the distribution based on node priority. Nodes having less leases
on them will have higher priority. Later this approach can be modified in order
to calculate the node priority using user load, data
was:
Currently, if we have a cluster of 3 nodes and a zone of 5 partitions, there is
relatively high chance that some node will have no primary replica for any
partition located on it.
For 10 partition this chance is much lower but still exists.
It shows that LeaseUpdater#nextLeaseHolder provides distribution far from even.
> Make lease distribution more even
> ---------------------------------
>
> Key: IGNITE-22067
> URL: https://issues.apache.org/jira/browse/IGNITE-22067
> Project: Ignite
> Issue Type: Bug
> Reporter: Denis Chudov
> Priority: Major
> Labels: ignite-3
>
> *Motivation*
> Currently, if we have a cluster of 3 nodes and a zone of 5 partitions, there
> is relatively high chance that some node will have no primary replica for any
> partition located on it.
> For 10 partition this chance is much lower but still exists.
> It shows that LeaseUpdater#nextLeaseHolder provides distribution far from
> even.
> *Definition of done*
> Initial lease distribution has to be made decently even. However, it can be
> not preserved during the lifetime of the cluster, because leases don't have
> to be moved every time when the topology changes.
> *Implementation notes*
> We can make the distribution based on node priority. Nodes having less leases
> on them will have higher priority. Later this approach can be modified in
> order to calculate the node priority using user load, data
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