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From "Ivan Rakov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-6033) Add sorted and multithreaded modes in checkpoint algorithm
Date Tue, 29 Aug 2017 15:10:02 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-6033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16145448#comment-16145448
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Ivan Rakov commented on IGNITE-6033:
------------------------------------

Separate ticket is created for .NET fix - IGNITE-6216.

> Add sorted and multithreaded modes in checkpoint algorithm
> ----------------------------------------------------------
>
>                 Key: IGNITE-6033
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6033
>             Project: Ignite
>          Issue Type: Improvement
>          Components: persistence
>    Affects Versions: 2.1
>            Reporter: Ivan Rakov
>            Assignee: Ivan Rakov
>             Fix For: 2.3
>
>
> Sequential writes to SSD are faster than random. When we write checkpoint, we iterate
through hash table, which is actually random order. We should add an option to write pages
sorted by page index. It should be configured in PersistentStoreConfiguration.
> Also, we already have PersistentStoreConfiguration#checkpointingThreads option, but we
don't use it - we create thread pool, but submit only one task to it. This should be fixed
as well.



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