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https://issues.apache.org/jira/browse/IGNITE-5961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Rakov updated IGNITE-5961:
-------------------------------
Description:
We store 17 bytes of header at the start of every partition file:
{noformat}
/** Allocated field offset. */
static final int HEADER_SIZE = 8/*SIGNATURE*/ + 4/*VERSION*/ + 1/*type*/ +
4/*page size*/;
{noformat}
Even if pageSize is equal to OS page cache size and equal to SSD disk page size
(which is best scenario), we generate two dirty pages instead of one. This is
suboptimal and can be a bottleneck of checkpoint write speed.
was:
We store 17 bytes of header at the start of every partition file:
{noformat}
/** Allocated field offset. */
static final int HEADER_SIZE = 8/*SIGNATURE*/ + 4/*VERSION*/ + 1/*type*/ +
4/*page size*/;
{noformat}
Even if pageSize is equal to OS page cache size and equal to SSD disk page size
(which is best scenario), when generate two dirty pages insteadf of one. This
is suboptimal and can be a bottleneck of checkpoint write speed.
> Align pages in LFS partition files to pageSize
> ----------------------------------------------
>
> Key: IGNITE-5961
> URL: https://issues.apache.org/jira/browse/IGNITE-5961
> Project: Ignite
> Issue Type: Improvement
> Components: persistence
> Affects Versions: 2.1
> Reporter: Ivan Rakov
> Assignee: Ivan Rakov
> Priority: Critical
> Fix For: 2.2
>
>
> We store 17 bytes of header at the start of every partition file:
> {noformat}
> /** Allocated field offset. */
> static final int HEADER_SIZE = 8/*SIGNATURE*/ + 4/*VERSION*/ + 1/*type*/
> + 4/*page size*/;
> {noformat}
> Even if pageSize is equal to OS page cache size and equal to SSD disk page
> size (which is best scenario), we generate two dirty pages instead of one.
> This is suboptimal and can be a bottleneck of checkpoint write speed.
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