[jira] [Assigned] (NIFI-2850) Provide ability for a FlowFile to be migrated from one Process Session to another

["Joseph Witt (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-2850?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joseph Witt reassigned NIFI-2850:
---------------------------------

    Assignee: Joseph Witt  (was: Mark Payne)

> 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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