[Bugs] [Bug 1561721] New: Rebalance failures on a dispersed volume with lookup-optimize enabled

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1561721

            Bug ID: 1561721
           Summary: Rebalance failures on a dispersed volume with
                    lookup-optimize enabled
           Product: GlusterFS
           Version: 4.0
         Component: disperse
          Assignee: bugs at gluster.org
          Reporter: jahernan at redhat.com
                CC: bugs at gluster.org
        Depends On: 1561406



+++ This bug was initially created as a clone of Bug #1561406 +++

Description of problem:

When rebalance is executed after adding a brick (or some other operation that
changes the layout) on a dispersed volume with lookup-optimize enabled, some
files are not migrated to the right brick.

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


How reproducible:

Always

Steps to Reproduce:
1. Create a disperse volume
2. Enable lookup-optimize
3. Create some files
4. Add new bricks
5. Run rebalance

Actual results:

Some files are not migrated

Expected results:

All files should be migrated

Additional info:

There's a bug in EC that causes the request for
trusted.glusterfs.list-node-uuids xattr to be only processed in one subvolume.
This causes that the resulting list only contains one of the UUIDs and all the
other are set to the null uuid, as if they were down.


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1561406
[Bug 1561406] Rebalance failures on a dispersed volume with lookup-optimize
enabled
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