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https://issues.apache.org/jira/browse/NIFI-1183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009372#comment-15009372
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Oleg Zhurakousky commented on NIFI-1183:
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After some digging the problem is indefinite block when _@OnSchedule_ operation
in Processor is invoked. It essentially creates a deadlock since _@OnSchedule_
operation synchronized on the same lock as _stopProcessor()_.
> Failed to stop failing processor
> ---------------------------------
>
> Key: NIFI-1183
> URL: https://issues.apache.org/jira/browse/NIFI-1183
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 0.3.0
> Reporter: Oleg Zhurakousky
> Assignee: Oleg Zhurakousky
> Priority: Critical
> Fix For: 0.4.0
>
> Attachments: thread-dump.txt
>
>
> The issue manifested itself with some failure in GetKafka. The thread dump
> appears to be pointing to deadlock originated with some Zookeeper failure
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