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Posted to dev@samoa.apache.org by "Maciej Grzenda (JIRA)" <ji...@apache.org> on 2017/07/17 14:37:00 UTC

[jira] [Created] (SAMOA-71) HorizontalAMRulesRegressor fails with ConcurrentModificationException

Maciej Grzenda created SAMOA-71:
-----------------------------------

             Summary: HorizontalAMRulesRegressor fails with ConcurrentModificationException
                 Key: SAMOA-71
                 URL: https://issues.apache.org/jira/browse/SAMOA-71
             Project: SAMOA
          Issue Type: Bug
          Components: SAMOA-API
            Reporter: Maciej Grzenda
            Priority: Minor


When Horizontal Adaptive Model Rules Regressor is used, AMRRuleSetProcessor that is used in turn occasionally fails with ConcurrentModificationException:

Exception in thread "main" java.util.ConcurrentModificationException
        at java.util.LinkedList$ListItr.checkForComodification(Unknown Source)
        at java.util.LinkedList$ListItr.next(Unknown Source)
        at org.apache.samoa.learners.classifiers.rules.distributed.AMRRuleSetPro
cessor.processInstanceEvent(AMRRuleSetProcessor.java:130)

The reason seems to be ruleSet is not thread-safe, but this can be possibly changed.



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