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https://issues.apache.org/jira/browse/GIRAPH-1187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177922#comment-17177922
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Dionysios Logothetis commented on GIRAPH-1187:
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[~ruweih], so the handler is initialized inside
GraphTaskManager.installGCMonitoring(). How about we initialize gcTimeMetric
there, just before we create the handler.
> NPE in worker GC listener
> --------------------------
>
> Key: GIRAPH-1187
> URL: https://issues.apache.org/jira/browse/GIRAPH-1187
> Project: Giraph
> Issue Type: Bug
> Components: graph
> Affects Versions: 1.2.0
> Environment: Giraph 1.2.0 running in M/R on Hadoop 2.6
> Reporter: Randy Hu
> Priority: Critical
>
> Likely the GC notification happened before any super step, in which case "
> gcTimeMetric" is not initialized at all. Here is stack trace:
>
> java.lang.NullPointerException at
> org.apache.giraph.graph.GraphTaskManager$1.handleNotification(GraphTaskManager.java:667)
> at
> sun.management.NotificationEmitterSupport.sendNotification(NotificationEmitterSupport.java:156)
> at
> sun.management.GarbageCollectorImpl.createGCNotification(GarbageCollectorImpl.java:143)
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