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From "Maxim Muzafarov (Jira)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-9314) MVCC TX: Datastreamer operations
Date Thu, 03 Oct 2019 09:59:02 GMT

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

Maxim Muzafarov updated IGNITE-9314:
    Fix Version/s:     (was: 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
>            Reporter: Igor Seliverstov
>            Priority: Major
>             Fix For: 2.9
> Need to change DataStreamer semantics.
> {{allowOverwrite=false}} mode currently is inconsistent with interval _partition counters_
update approach used by MVCC transactions.
> {{allowOverwrite=true}} mode is terribly slow when using single {{cache.put}} operations
(snapshot request, tx commit on coordinator overhead). Batched mode using {{cache.putAll}}
should handle write conflicts and possible deadlocks.
> 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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