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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