[jira] [Created] (IGNITE-7501) Improve underlying iterators closing process for cache iterators.

[Anton Vinogradov (Jira)]

Roman Kondakov created IGNITE-7501:
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             Summary: Improve underlying iterators closing process for cache iterators.
                 Key: IGNITE-7501
                 URL: https://issues.apache.org/jira/browse/IGNITE-7501
             Project: Ignite
          Issue Type: Improvement
          Components: cache
    Affects Versions: 2.3
            Reporter: Roman Kondakov
             Fix For: 2.5


When we call {{javax.cache.Cache#iterator()}}  we get {{java.util.Iterator}} which doesn't have a {{close()}} method. But underlying {{GridCloseableIterator}} does have this method and it should be called when all the work with the current iterator is done. Currently calling {{close()}} for the underlying closeable iterator is delegated to {{WeakQueryCloseableIterator}}. So, {{close()}} method is usually called on a garbage collection phase, which is not acceptable in some situations. For example if MVCC is enabled this *late* iterator closing could dramatically increase the active queries tracking list size which  could lead to the performance and garbage collection ("vacuum") issues.



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