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From "Igor Belyakov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-11970) Excessive use of memory in continuous queries
Date Tue, 09 Jul 2019 10:25:00 GMT
Igor Belyakov created IGNITE-11970:
--------------------------------------

             Summary: Excessive use of memory in continuous queries
                 Key: IGNITE-11970
                 URL: https://issues.apache.org/jira/browse/IGNITE-11970
             Project: Ignite
          Issue Type: Bug
            Reporter: Igor Belyakov


When we prepare to send an entry into the continuous query's filter and listener, we store
it in an instance of CacheContinuousQueryEventBuffer.Batch.
The batch is an array of entries of size IGNITE_CONTINUOUS_QUERY_SERVER_BUFFER_SIZE (default
is 1000) that stores the currently received entries (we need it for the case of concurrent
updates to make sure that we preserve the order of update counters).

The issue is that when we process a part of the array we keep the links to the processed entries
until we exhaust the array (after when we finally clear it). Because of that we may store
up to 999 garbage objects which can be a lot if the entries are big.

Need to clear the entries right after we've processed them.



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