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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-9314) MVCC TX: Datastreamer operations
Date Fri, 14 Sep 2018 12:31:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-9314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov updated IGNITE-9314:
------------------------------------
    Fix Version/s:     (was: 2.7)
                   2.8

> MVCC TX: Datastreamer operations
> --------------------------------
>
>                 Key: IGNITE-9314
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9314
>             Project: Ignite
>          Issue Type: Task
>          Components: mvcc, sql
>            Reporter: Igor Seliverstov
>            Priority: Major
>             Fix For: 2.8
>
>
> Need to change DataStreamer semantics (make it transactional)
> Currently clients can see DataStreamer partial writes and two subsequent selects, which
are run in scope of one transaction at load time, may return different results.
> Related thread:
>  [http://apache-ignite-developers.2346864.n4.nabble.com/MVCC-and-IgniteDataStreamer-td32340.html]
> Also there is a problem when {{DataStreamer}} with {{allowOverwrite == false}} does not
insert value when versions for entry exist but they all are aborted. Proper transactional
semantics should developed for such case. After that attention should be put on Cache.size
method behavior. Cache.size addressed in https://issues.apache.org/jira/browse/IGNITE-8149 could
be decremented improperly in {{org.apache.ignite.internal.processors.cache.IgniteCacheOffheapManager#mvccRemoveAll
method (called during streamer processing) when all existing mvcc row versions are aborted
or last committed one is _remove_ version.}}



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