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From "Dmitriy Pavlov (Jira)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-12081) Page replacement can reload invalid page during checkpoint
Date Wed, 28 Aug 2019 11:57:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-12081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Dmitriy Pavlov updated IGNITE-12081:
    Ignite Flags: Docs Required,Release Notes Required  (was: Docs Required)

> Page replacement can reload invalid page during checkpoint
> ----------------------------------------------------------
>                 Key: IGNITE-12081
>                 URL: https://issues.apache.org/jira/browse/IGNITE-12081
>             Project: Ignite
>          Issue Type: Bug
>            Reporter: Dmitriy Govorukhin
>            Assignee: Dmitriy Govorukhin
>            Priority: Critical
>              Labels: 2.7.6-rc0
>             Fix For: 2.7.6
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
> There is a race between {{writeCheckpointPages}} and page replacement process:
>  * Checkpointer thread begins a checkpoint
>  * Checkpointer thread calls {{getPageForCheckpoint()}}, which will copy page content *and
clear dirty flag*
>  * Page replacement tries to find a page for replacement and chooses this page, the page
is thrown away
>  * Before the page is written back to the store, the page is acquired again.
> As a result, an older copy of the page is brought back to memory, which causes all kinds
of corruption exceptions and assertions.
> The attached unit test demonstrates the issue. It is likely that all baselines are affected
starting from 2.4
> As a part of this ticket, we must add more unit-tests for checkpointing protocol invariants
we rely on.

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