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https://issues.apache.org/jira/browse/IGNITE-19819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Denis Chudov updated IGNITE-19819:
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Description:
*Motivation*
After IGNITE-19578 leases should be stored as a single batch in meta storage.
However, the size of such a batch is significant and can be reduced.
Each lease contains group name, 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*
Amount of space required for storing leases 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.
was:After IGNITE-19578 leases should be stored as a single batch in meta
storage. However, the size of such a batch is significant and can be reduced.
> Lease batches compaction
> ------------------------
>
> Key: IGNITE-19819
> URL: https://issues.apache.org/jira/browse/IGNITE-19819
> Project: Ignite
> Issue Type: Improvement
> Reporter: Denis Chudov
> Assignee: Vyacheslav Koptilin
> Priority: Major
> Labels: ignite-3
>
> *Motivation*
> After IGNITE-19578 leases should be stored as a single batch in meta storage.
> However, the size of such a batch is significant and can be reduced.
> Each lease contains group name, 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*
> Amount of space required for storing leases 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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