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From "Maxim Muzafarov (Jira)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-11156) FreeLists are overflowed with pages with almost no free space left
Date Wed, 02 Oct 2019 15:42:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-11156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Maxim Muzafarov updated IGNITE-11156:
-------------------------------------
    Fix Version/s:     (was: 2.8)

> FreeLists are overflowed with pages with almost no free space left
> ------------------------------------------------------------------
>
>                 Key: IGNITE-11156
>                 URL: https://issues.apache.org/jira/browse/IGNITE-11156
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Ivan Rakov
>            Assignee: Ivan Rakov
>            Priority: Major
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> {code:java}
>     /** */
>     private static final int MIN_PAGE_FREE_SPACE = 8;
> {code}
> If data page has 8 unused bytes or more, it will be stored in a free list. As result,
free lists mostly contain "free pages" that are actually useless: pair of (boolean, boolean)
takes approximately 50 bytes. I think, we'll increase this constant to something like 40,
memory will be used more efficiently and WAL usage will decrease in result.



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