[Bugs] [Bug 1264926] New: Data Tiering:detach tier commit with force is resulting in loss of IO(Transport endpoint is not connected)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1264926

            Bug ID: 1264926
           Summary: Data Tiering:detach tier commit with force is
                    resulting in loss of IO(Transport endpoint is not
                    connected)
           Product: GlusterFS
           Version: 3.7.4
         Component: tiering
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: nchilaka at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:
========================
I issued a direct commit force on a tier volume with IOs happening (say file
creates of 10000). the new file creates for many files failed during the commit
phase as below
touch: cannot touch ‘f995’: Transport endpoint is not connected
touch: cannot touch ‘f996’: Transport endpoint is not connected
touch: cannot touch ‘f997’: Transport endpoint is not connected
touch: cannot touch ‘f998’: Transport endpoint is not connected
touch: cannot touch ‘f999’: Transport endpoint is not connected
touch: cannot touch ‘f1000’: Transport endpoint is not connected
touch: cannot touch ‘f1001’: Transport endpoint is not connected
touch: cannot touch ‘f1002’: Transport endpoint is not connected
touch: cannot touch ‘f1003’: Transport endpoint is not connected
touch: cannot touch ‘f1004’: Transport endpoint is not connected
touch: cannot touch ‘f1005’: Transport endpoint is not connected
touch: cannot touch ‘f1006’: Transport endpoint is not connected
touch: cannot touch ‘f1007’: Transport endpoint is not connected
touch: cannot touch ‘f1008’: Transport endpoint is not connected
touch: cannot touch ‘f1009’: Transport endpoint is not connected


However, files continued with creation after certain point.
In my case i did a touch of f{1..10000} and issued detach-tier force commit.
files f840 to f1019 failed to created with transport end point error.
the files from f1020 till f10000 got created

[root at zod ~]# gluster --version
glusterfs 3.7.4 built on Sep 19 2015 01:30:43
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 ~]# rpm -qa|grep gluster
glusterfs-3.7.4-0.43.gitf139283.el7.centos.x86_64
glusterfs-fuse-3.7.4-0.43.gitf139283.el7.centos.x86_64
glusterfs-debuginfo-3.7.4-0.33.git1d02d4b.el7.centos.x86_64
glusterfs-api-3.7.4-0.43.gitf139283.el7.centos.x86_64
glusterfs-client-xlators-3.7.4-0.43.gitf139283.el7.centos.x86_64
glusterfs-server-3.7.4-0.43.gitf139283.el7.centos.x86_64
glusterfs-cli-3.7.4-0.43.gitf139283.el7.centos.x86_64
glusterfs-libs-3.7.4-0.43.gitf139283.el7.centos.x86_64
[root at zod ~]# 

Steps to Reproduce:
1.do file creates using touch for some 10000 files
2.issue a detach tier force commit
3.IO error will be seen for sometim

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