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

["Mark Payne (JIRA)" <ji...@apache.org>]

Mark Payne created NIFI-2850:
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             Summary: 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: Mark Payne
             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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