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https://issues.apache.org/jira/browse/AMBARI-12009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Speidel resolved AMBARI-12009.
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Resolution: Fixed
merged to trunk and branch-2.1
> Occasional concurrent modification exception during BP provision of large
> clusters
> ----------------------------------------------------------------------------------
>
> Key: AMBARI-12009
> URL: https://issues.apache.org/jira/browse/AMBARI-12009
> Project: Ambari
> Issue Type: Bug
> Components: blueprints
> Affects Versions: 2.1.0
> Reporter: John Speidel
> Assignee: John Speidel
> Fix For: 2.1.0
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> When provisioning large clusters via a blueprint, a concurrent modification
> exception may occur occasionally because the topology manager task executor
> thread is attempting to create a copy of a collection that is being modified
> in another thread. Although this exception is caught in the BP provisioning
> code and retried successfully it is an easy fix and should be fixed in 2.1 to
> avoid retries which slows down cluster provisioning.
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