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https://issues.apache.org/jira/browse/NIFI-4938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389296#comment-16389296
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ASF GitHub Bot commented on NIFI-4938:
--------------------------------------

Github user Himanshu-it commented on the issue:

    https://github.com/apache/nifi/pull/2514
  
    continuous integration with travis falis with concurrent modification error 
in 
"TestFileSystemRepository.testMinimalArchiveCleanupIntervalHonoredAndLogged:151",
 but locally I have build with
    mvn clean install and mvn -Pcontrib-check clean install, both are working 
fine. Any pointers on this. 


> Offline buffering is not supported by paho client version 1.0.2 used in mqtt 
> processors.
> ----------------------------------------------------------------------------------------
>
>                 Key: NIFI-4938
>                 URL: https://issues.apache.org/jira/browse/NIFI-4938
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Himanshu Mishra
>            Priority: Major
>
> Off line buffering is not supported by paho client version 1.0.2 used in mqtt 
> processors which causes problem of "message loss" with QoS 1 and QoS 2 for 
> mqtt messages when the client connectivity is lost.
> The version 1.2.0 of paho client supports this off line buffering. Thus 
> addressing this issue.



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