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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OPENJPA-2285) L2 cache doesn't store FK(s) back into the cache when lazy loading data.
Date Thu, 25 Oct 2012 19:11:12 GMT
Rick Curtis created OPENJPA-2285:
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             Summary: L2 cache doesn't store FK(s) back into the cache when lazy loading data.
                 Key: OPENJPA-2285
                 URL: https://issues.apache.org/jira/browse/OPENJPA-2285
             Project: OpenJPA
          Issue Type: Bug
          Components: datacache, performance
    Affects Versions: 2.2.0, 2.1.1, 2.0.1, 2.3.0
            Reporter: Rick Curtis
            Assignee: Rick Curtis
             Fix For: 2.3.0, 2.2.1


I ran into a performance bug recently where we aren't caching data, but we could be. The data
that we aren't caching is when lazy loading an unowned relationship .

For instance, if we have the model Person <-> Address(LAZY, owner) and we find Person,
that data will get stored in the cache. Since Address owns the relationship, we don't have
the FK to cache(yet). Later we go to lazily load the address and we need to issue a joined
query to find the Address which corresponds to our Person. Once that data has been loaded,
we don't store the FK back into the cache.

With this JIRA I'm going to introduce a change that will make our runtime re-cache the Person
data when additional data is loaded.

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