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From "Ilya Kasnacheev (Jira)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-12131) MMAP mode should be disabled by default for WAL manager
Date Mon, 02 Sep 2019 10:59:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-12131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16920777#comment-16920777

Ilya Kasnacheev commented on IGNITE-12131:

To the contrary, I think this is not just implementation detail, but a setting relevant to
performance tuning and/or functionality. As such, it should be accessible.

In my opinion, if we ever have both 'mmap' and 'no mmap', we should introduce a configuration

If we drop either one, it's not needed :)

> MMAP mode should be disabled by default for WAL manager
> -------------------------------------------------------
>                 Key: IGNITE-12131
>                 URL: https://issues.apache.org/jira/browse/IGNITE-12131
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Andrey Gura
>            Assignee: Andrey Gura
>            Priority: Major
>             Fix For: 2.8
> MMAP mode has a bunch of problems (see for example http://www.mapdb.org/blog/mmap_files_alloc_and_jvm_crash/
> Users are increasingly stumbling over these issues especially in virtualized environments.
> MMAP should be disabled by default because it requires additional care from user stand

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