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Posted to dev@ignite.apache.org by "Roman Kondakov (JIRA)" <ji...@apache.org> on 2018/12/14 14:28:00 UTC

[jira] [Created] (IGNITE-10694) MVCC: Possible recycled pages leak.

Roman Kondakov created IGNITE-10694:
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             Summary: MVCC: Possible recycled pages leak.
                 Key: IGNITE-10694
                 URL: https://issues.apache.org/jira/browse/IGNITE-10694
             Project: Ignite
          Issue Type: Bug
          Components: mvcc
            Reporter: Roman Kondakov


Let's consider the following scenario: put N items to cache and then remove all these N items. If you repeat this scenario two times, you expect that the same number of pages will be recycled each time. But for enabled MVCC this is not the case. Reproducers:

* {{PageEvictionPagesRecyclingAndReusingTest#testPagesRecyclingAndReusingMvccTxPartitioned}}
* {{PageEvictionPagesRecyclingAndReusingTest#testPagesRecyclingAndReusingMvccTxReplicated}}

Perhaps this is because the vacuum does not clean deleted rows completely. Detailed investigation is needed.



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