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https://issues.apache.org/jira/browse/IGNITE-426?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nikolay Tikhonov closed IGNITE-426.
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> Make sure continuous queries notifications are not missed in case primary
> node fails
> ------------------------------------------------------------------------------------
>
> Key: IGNITE-426
> URL: https://issues.apache.org/jira/browse/IGNITE-426
> Project: Ignite
> Issue Type: Sub-task
> Components: cache
> Reporter: Yakov Zhdanov
> Assignee: Nikolay Tikhonov
> Priority: Critical
> Fix For: 1.5
>
>
> * Maintain updates queue on backup node(s) in addition to primary node.
> * If primary node crushes, this queue is flushed to listening clients.
> * To avoid notification duplicates we will have a per-partition update
> counter. Once an entry in some partition is updated, counter for this
> partition is incremented on both primary and backups. The value of this
> counter is also sent along with the update to the client, which also
> maintains the copy of this mapping. If at some moment it receives an update
> with the counter less than in its local map, this update is a duplicate and
> can be discarded.
> * To cleanup the backup queue we will use communication acks. When batch
> receival is acked by the client, we will send special ack message to backup
> nodes that will remove items that are not longer needed. This message has to
> contain partition to latest update counter map.
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