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https://issues.apache.org/jira/browse/GIRAPH-853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13901653#comment-13901653
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Avery Ching commented on GIRAPH-853:
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+1, thanks for fixing this irritation!
> Fix concurrency issue in GiraphMetrics
> --------------------------------------
>
> Key: GIRAPH-853
> URL: https://issues.apache.org/jira/browse/GIRAPH-853
> Project: Giraph
> Issue Type: Bug
> Reporter: Maja Kabiljo
> Assignee: Maja Kabiljo
> Attachments: GIRAPH-853.patch
>
>
> Tests sometimes fail due to concurrency issue in GiraphMetrics when adding
> observers
> Caused by: java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819)
> at java.util.ArrayList$Itr.next(ArrayList.java:791)
> at
> org.apache.giraph.metrics.GiraphMetrics.resetSuperstepMetrics(GiraphMetrics.java:134)
> at
> org.apache.giraph.graph.GraphTaskManager.checkTaskState(GraphTaskManager.java:829)
> ...
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