[jira] [Updated] (IGNITE-25766) Incorrect metric value TotalAllocatedPages for in-memory cache groups

["Didar Shayarov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-25766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Didar Shayarov updated IGNITE-25766:
------------------------------------
    Labels: ise  (was: )

> Incorrect metric value TotalAllocatedPages for in-memory cache groups
> ---------------------------------------------------------------------
>
>                 Key: IGNITE-25766
>                 URL: https://issues.apache.org/jira/browse/IGNITE-25766
>             Project: Ignite
>          Issue Type: Bug
>            Reporter: Aleksey Plekhanov
>            Priority: Major
>              Labels: ise
>
> Metric {{TotalAllocatedPages}} was introduced by IGNITE-14774, but value of this metric is incorrect:
> {noformat}
>     public void testTotalAllocatedPagesForInMemoryCacheGroups() throws Exception {
>         IgniteEx ignite = startGrid(0);
>         IgniteCache<Integer, byte[]> cache1 = ignite.createCache("cache1");
>         IgniteCache<Integer, byte[]> cache2 = ignite.createCache("cache2");
>         IgniteCache<Integer, byte[]> cache3 = ignite.createCache("cache3");
>         for (int i = 0; i < 1000; i++) {
>             cache1.put(i, new byte[200]);
>             cache2.put(i, new byte[3700]);
>         }
>         CacheGroupContext grp1 = ignite.cachex(cache1.getName()).context().group();
>         CacheGroupContext grp2 = ignite.cachex(cache2.getName()).context().group();
>         CacheGroupContext grp3 = ignite.cachex(cache3.getName()).context().group();
>         assertTrue(grp1.metrics().getTotalAllocatedPages() < grp2.metrics().getTotalAllocatedPages());
>         assertEquals(0, grp3.metrics().getTotalAllocatedPages());
>     }
> {noformat}
> Metric was added without any tests. Wrong metric result confuses users. Moreover, it's impossible to calculate such a metric, because for in-memory mode one data page can contain data for different cache groups. Additionally, certain data structures are shared across different caches (page lists, for example).
> Perhaps it worth to set this metric to 0. 



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