[Bugs] [Bug 1263724] New: Data Tieirng:Detach tier status shows number of failures even when all files are migrated successfully

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1263724

            Bug ID: 1263724
           Summary: Data Tieirng:Detach tier status shows number of
                    failures even when all files are migrated successfully
           Product: GlusterFS
           Version: mainline
         Component: tiering
          Keywords: Triaged
          Severity: high
          Priority: urgent
          Assignee: bugs at gluster.org
          Reporter: dlambrig at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org, dlambrig at redhat.com,
                    nchilaka at redhat.com, rkavunga at redhat.com
        Depends On: 1262408



+++ This bug was initially created as a clone of Bug #1262408 +++

Description of problem:
=========================
When we have many files, say about 5000 files in hot tier, and when detach tier
is issued, we can see many files as failed in detach tier status, in this case
about 2000 files. But all files are migrated, if we check the backend bricks.

So, is this spurious errors or a serious miss?



[root at zod glusterfs]# gluster v detach-tier vol100 status
                                    Node Rebalanced-files          size      
scanned      failures       skipped               status   run time in secs
                               ---------      -----------   -----------  
-----------   -----------   -----------         ------------     --------------
                               localhost                0        0Bytes        
    0             0             0          in progress               0.00
                                  yarrow                0        0Bytes        
    0             0             0          in progress               0.00
[root at zod glusterfs]# gluster v detach-tier vol100 status
                                    Node Rebalanced-files          size      
scanned      failures       skipped               status   run time in secs
                               ---------      -----------   -----------  
-----------   -----------   -----------         ------------     --------------
                               localhost             1157         2.5GB        
 4736          1814             0            completed              98.00
                                  yarrow             1897       526.1MB        
 3056          1156             0            completed              97.00

Version-Release number of selected component (if applicable):
================================================================
[root at zod ~]# rpm -qa|grep gluster
glusterfs-client-xlators-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-cli-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-libs-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-api-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-fuse-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-debuginfo-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-server-3.7.4-0.27.git143f0f9.el7.centos.x86_64
glusterfs-3.7.4-0.27.git143f0f9.el7.centos.x86_64
[root at zod ~]# gluster --version
glusterfs 3.7.4 built on Sep  9 2015 01:30:47
Repository revision: git://git.gluster.com/glusterfs.git
Copyright (c) 2006-2011 Gluster Inc. <http://www.gluster.com>
GlusterFS comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GlusterFS under the terms of the GNU General
Public License.
[root at zod ~]# 



Steps to Reproduce:
==================
1.have a tier volume and create thousands of files such that they are in hot
tier
2.now issue a detach tier start and wait for it to complete
3.now check the detach tier status, which will show as complete for each node.
But it can also be seen many failures

[root at zod glusterfs]# gluster v detach-tier vol100 status
                                    Node Rebalanced-files          size      
scanned      failures       skipped               status   run time in secs
                               ---------      -----------   -----------  
-----------   -----------   -----------         ------------     --------------
                               localhost                0        0Bytes        
    0             0             0          in progress               0.00
                                  yarrow                0        0Bytes        
    0             0             0          in progress               0.00
[root at zod glusterfs]# gluster v detach-tier vol100 status
                                    Node Rebalanced-files          size      
scanned      failures       skipped               status   run time in secs
                               ---------      -----------   -----------  
-----------   -----------   -----------         ------------     --------------
                               localhost             1157         2.5GB        
 4736          1814             0            completed              98.00
                                  yarrow             1897       526.1MB        
 3056          1156             0            completed              97.00


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1262408
[Bug 1262408] Data Tieirng:Detach tier status shows number of failures even
when all files are migrated successfully
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