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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-4636) AbstractCEPPatternOperator fails to restore state
Date Mon, 19 Sep 2016 18:30:20 GMT
Fabian Hueske created FLINK-4636:
------------------------------------

             Summary: AbstractCEPPatternOperator fails to restore state
                 Key: FLINK-4636
                 URL: https://issues.apache.org/jira/browse/FLINK-4636
             Project: Flink
          Issue Type: Bug
          Components: CEP
    Affects Versions: 1.1.2, 1.2.0
            Reporter: Fabian Hueske
             Fix For: 1.2.0, 1.1.3


The {{restoreState()}} of the {{AbstractCEPPatternOperator}} restores the a Java {{PriorityQueue}}.
For that it first reads the number of elements to insert and then creates a {{PriorityQueue}}
object. However, Java's {{PriorityQueue}} cannot be instantiated with an initial capacity
of {{0}}, which is not checked.
In case of an empty queue, the {{PriorityQueue}} should be instantiated with an initial size
of {{1}}.

See http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Problem-with-CEPPatternOperator-when-taskmanager-is-killed-tp9024.html



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