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https://issues.apache.org/jira/browse/NIFI-2850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575867#comment-15575867
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ASF GitHub Bot commented on NIFI-2850:
--------------------------------------

Github user olegz commented on the issue:

    https://github.com/apache/nifi/pull/1115
  
    Reviewing. . .


> Provide ability for a FlowFile to be migrated from one Process Session to 
> another
> ---------------------------------------------------------------------------------
>
>                 Key: NIFI-2850
>                 URL: https://issues.apache.org/jira/browse/NIFI-2850
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Mark Payne
>            Assignee: Joseph Witt
>             Fix For: 1.1.0
>
>
> Currently, the MergeContent processor creates a separate ProcessSession for 
> each FlowFile that it pulls. This is done so that we can ensure that we can 
> commit all Process Sessions when a bin is full. Unfortunately, this means 
> that MergeContent is required to call ProcessSession.get() many times, which 
> adds a lot of contention on the FlowFile Queue. If we allow FlowFiles to be 
> migrated from 1 session to another, we can have a session per bin, and then 
> use ProcessSession.get(100) to greatly reduce lock contention. This will 
> likely have benefits in other processors as well.



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