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From "Ivan Pavlukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-9828) MVCC: Continuous query failover.
Date Tue, 23 Oct 2018 12:24:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-9828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16660559#comment-16660559
] 

Ivan Pavlukhin commented on IGNITE-9828:
----------------------------------------

In ticket https://issues.apache.org/jira/browse/IGNITE-5935 partition counters "gap" closing
was implemented. Gaps are closed in a way that all numeric counter values are consistent after
PME. See method {{PartitionUpdateCounter.finalizeUpdateCountres}}. The missing part is CQ
manager notification in situation of gap closing.

> MVCC: Continuous query failover.
> --------------------------------
>
>                 Key: IGNITE-9828
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9828
>             Project: Ignite
>          Issue Type: Task
>          Components: mvcc
>            Reporter: Roman Kondakov
>            Priority: Major
>             Fix For: 2.8
>
>
> We need to implement failover procedure for CQ with MVCC caches. Thoughts:
> * Mvcc updates should be cached in the persistent off-heap data structures instead of
heap.
> * CQ failover tests should be adopted for mvcc scenarios. See {{IgniteCacheQuerySelfTestSuite4}}
> * We need to ensure the correctness of CQ and partition counters consistency in cases
when some of TX participants are in prepared state and others are marked as rollback only.
It looks like it doesn't work properly now.



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