[Bugs] [Bug 1368128] New: tiering: avoid ping-pong during appends

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1368128

            Bug ID: 1368128
           Summary: tiering: avoid ping-pong during appends
           Product: GlusterFS
           Version: mainline
         Component: tiering
          Assignee: bugs at gluster.org
          Reporter: mchangir at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:
when file is being written, especially appended to, then file ping-pongs
between cold and hot tier

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


How reproducible:
always


Steps to Reproduce:
1. create file BIGDEMO-1 on cold tier at mount point: /mnt/twoXtwo
2. attach hot tier bricks
3. start appending to file using the following shell command:

while true; do
    dd if=/dev/urandom of=/mnt/twoXtwo/BIGDEMO-1 ibs=1024 obs=2014 \
       conv=notrunc oflag=append count=100;
    ls -l /mnt/twoXtwo;
    sleep 1;
done

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