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From "Ivan Pavlukhin (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (IGNITE-8149) MVCC TX: Size method should use tx snapshot
Date Mon, 27 Aug 2018 10:42:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-8149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593465#comment-16593465
] 

Ivan Pavlukhin edited comment on IGNITE-8149 at 8/27/18 10:41 AM:
------------------------------------------------------------------

Basic idea of size calculation is based on following points:
* Introduced TxCounters entity is used for accumulation various counters of running transaction.
* During transaction execution size delta is accumulated in TxCounters by mutating operations.
* Delta is accumulated similarly on primary and backup partitions (and is not sent across
network).
* Size changes become visible in the end of transaction.


was (Author: pavlukhin):
Basic idea of size calculation is based on following points:
* Introduced TxCounters entity is used for accumulation various counters of running transaction.
* During transaction execution size delta is accumulated in TxCounters by mutating operations.
* Size changes become visible in the end of transaction.

> MVCC TX: Size method should use tx snapshot
> -------------------------------------------
>
>                 Key: IGNITE-8149
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8149
>             Project: Ignite
>          Issue Type: Task
>          Components: cache, mvcc
>            Reporter: Igor Seliverstov
>            Assignee: Ivan Pavlukhin
>            Priority: Major
>             Fix For: 2.7
>
>
> Currently cache.size() returns number of entries in cache trees while there can be several
versions of one key-value pairs.
> We should use tx snapshot and count all passed mvcc filter entries instead.



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