[Gluster-devel] Release 3.10 testing update: Older client unable to mount post upgrade

[Shyam]

Hi,

Post upgrading brick nodes from 3.8.8 to 3.10rc0 (sort of), I tried a to 
mount from a 3.8.8 client (as I had not upgraded the client till then). 
The mount failed with the following in the logs (at the end of the mail).

The issue was that I did an rpm -U to get the latest version, so all vol 
files were upgraded (from the spec file, glusterd --xlator-option 
*.upgrade=on -N), this resulted in client vol files being upgraded as 
well, and now the client does not understand the option as below,

0-testvolssd-readdir-ahead: invalid number format "128KB" in option 
"rda-request-size"
0-testvolssd-readdir-ahead: validate of rda-request-size returned -1
0-testvolssd-readdir-ahead: validation failed: invalid number format 
"128KB" in option "rda-request-size"

So is this a bug? Or something to document? or, am I missing something? 
Poornima/Du/Atin?

Thanks,
Shyam

::Full logs::
# mount -t glusterfs 10.21.76.10:/testvolssd /mnt/testvol1
Mount failed. Please check the log file for more details.

# cat /var/log/glusterfs/mnt-testvol1.log
[2017-02-16 17:37:12.703983] I [MSGID: 100030] [glusterfsd.c:2454:main] 
0-/usr/sbin/glusterfs: Started running /usr/sbin/glusterfs version 3.8.8 
(args: /usr/sbin/glusterfs --volfile-server=10.21.76.10 
--volfile-id=/testvolssd /mnt/testvol1)
[2017-02-16 17:37:12.726213] I [MSGID: 101190] 
[event-epoll.c:628:event_dispatch_epoll_worker] 0-epoll: Started thread 
with index 1
[2017-02-16 17:37:12.744187] E [MSGID: 101002] 
[options.c:69:xlator_option_validate_int] 0-testvolssd-readdir-ahead: 
invalid number format "128KB" in option "rda-request-size"
[2017-02-16 17:37:12.744221] W [MSGID: 101029] 
[options.c:945:xl_opt_validate] 0-testvolssd-readdir-ahead: validate of 
rda-request-size returned -1
[2017-02-16 17:37:12.744235] E [MSGID: 101090] 
[graph.c:301:glusterfs_graph_validate_options] 
0-testvolssd-readdir-ahead: validation failed: invalid number format 
"128KB" in option "rda-request-size"
[2017-02-16 17:37:12.744248] E [MSGID: 101090] 
[graph.c:665:glusterfs_graph_activate] 0-graph: validate options failed
[2017-02-16 17:37:12.753368] W [glusterfsd.c:1327:cleanup_and_exit] 
(-->/usr/sbin/glusterfs(mgmt_getspec_cbk+0x3c1) [0x7fbf4eb38eb1] 
-->/usr/sbin/glusterfs(glusterfs_process_volfp+0x172) [0x7fbf4eb335d2] 
-->/usr/sbin/glusterfs(cleanup_and_exit+0x6b) [0x7fbf4eb32b4b] ) 0-: 
received signum (1), shutting down
[2017-02-16 17:37:12.753420] I [fuse-bridge.c:5794:fini] 0-fuse: 
Unmounting '/mnt/testvol1'.
[2017-02-16 17:37:12.753957] W [glusterfsd.c:1327:cleanup_and_exit] 
(-->/lib64/libpthread.so.0(+0x7dc5) [0x7fbf4d49edc5] 
-->/usr/sbin/glusterfs(glusterfs_sigwaiter+0xe5) [0x7fbf4eb32cd5] 
-->/usr/sbin/glusterfs(cleanup_and_exit+0x6b) [0x7fbf4eb32b4b] ) 0-: 
received signum (15), shutting down