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Posted to issues@ignite.apache.org by "Ivan Rakov (JIRA)" <ji...@apache.org> on 2019/01/30 18:54:00 UTC
[jira] [Updated] (IGNITE-11156) FreeLists are overflowed with pages
with almost no free space left
[ https://issues.apache.org/jira/browse/IGNITE-11156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ivan Rakov updated IGNITE-11156:
--------------------------------
Description:
{code:java}
/** */
private static final int MIN_PAGE_FREE_SPACE = 8;
{code}
If data page has 8 free 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 in result and WAL usage will decrease.
was:
{code:java}
/** */
private static final int MIN_PAGE_FREE_SPACE = 8;
{code}
If data pages has 8 free 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 in result and WAL usage will decrease.
> 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
> Fix For: 2.8
>
>
> {code:java}
> /** */
> private static final int MIN_PAGE_FREE_SPACE = 8;
> {code}
> If data page has 8 free 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 in result and WAL usage will decrease.
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