[Bugs] [Bug 1306852] New: Tiering threads can starve each other

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1306852

            Bug ID: 1306852
           Summary: Tiering threads can starve each other
           Product: GlusterFS
           Version: mainline
         Component: tiering
          Assignee: bugs at gluster.org
          Reporter: dlambrig at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:

It is possible the promotion thread will prevent the demotion thread from
running. This can happen if the promotion thread is moving data at the same
time the demotion thread should run.

Version-Release number of selected component (if applicable):

N/A

How reproducible:

Difficult

Steps to Reproduce:
1. Have a file on the hot tier that has become cold.
2. Promote many large files in a loop at the same time demotion is scheduled.
3. Observe demotion does not happen. 


Actual results:

File stays on hot tier.

Expected results:

File is demoted.

Additional info:

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