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https://issues.apache.org/jira/browse/IGNITE-19578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vyacheslav Koptilin reassigned IGNITE-19578:
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Assignee: Denis Chudov
> Decrease count of lease messages to meta storage
> ------------------------------------------------
>
> Key: IGNITE-19578
> URL: https://issues.apache.org/jira/browse/IGNITE-19578
> Project: Ignite
> Issue Type: Improvement
> Reporter: Denis Chudov
> Assignee: Denis Chudov
> Priority: Major
> Labels: ignite-3
> Time Spent: 20m
> Remaining Estimate: 0h
>
> *Motivation*
> Huge number of lease messages cause serious load on meta storage, which
> impacts the performance of a cluster overall. Each lease message contains
> prefix + group name as a key, and the value contains leaseholder name, left
> and right timestamp and couple of boolean flags.
> Many leases share the same leaseholder. Also, many leases share the same
> right border, as batch of leases are renewed on every iteration of lease
> updater and get the same right border.
> So, the compacted data structure for all leases could be a map
> {code:java}
> right border -> set of leaseholders -> set of leases which contain only group
> name, left border and flags.{code}
> It is important that this data structure is applicable to meta storage
> representation, in-memory representation of leases should remain the same.
> *Definition of done*
> Count of meta storage invokes from lease updater is significantly reduced.
> *Implementation notes*
> The key should be prefix + right border. On each iteration the corresponding
> right border should be removed and new one put, so on each iteration there
> will be done just one meta storage invoke.
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