[Bugs] [Bug 1664215] New: Toggling Read ahead translator off causes some clients to umount some of its volumes

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1664215

            Bug ID: 1664215
           Summary: Toggling Read ahead translator off causes some clients
                    to umount some of its volumes
           Product: GlusterFS
           Version: 3.12
          Hardware: other
                OS: Linux
            Status: NEW
         Component: read-ahead
          Severity: urgent
          Assignee: bugs at gluster.org
          Reporter: amgad.saleh at nokia.com
                CC: bugs at gluster.org
  Target Milestone: ---
    Classification: Community



Created attachment 1519119
  --> https://bugzilla.redhat.com/attachment.cgi?id=1519119&action=edit
Glusterfs client logs

Description of problem:

After turning the Read ahead translator "off", some of the clients (fuse) got
disconnected (umount) to one of the data volumes. Attached the glusterfs logs
from the client that experienced the disconnect. 

The following is an excerpt of the messages in the glusterfs/data.log.*
logfiles:
---
[2019-01-07 07:40:44.625789] I [fuse-bridge.c:4835:fuse_graph_sync] 0-fuse:
switched to graph 8
[2019-01-07 07:40:44.629594] I [MSGID: 114021] [client.c:2369:notify]
6-el_data-client-0: current graph is no longer active, destroying rpc_client
[2019-01-07 07:40:44.629651] I [MSGID: 114021] [client.c:2369:notify]
6-el_data-client-1: current graph is no longer active, destroying rpc_client
[2019-01-07 07:40:44.629668] I [MSGID: 114018]
[client.c:2285:client_rpc_notify] 6-el_data-client-0: disconnected from
el_data-client-0. Client process will keep trying to connect to glusterd until
brick's port is available
[2019-01-07 07:40:44.629724] I [MSGID: 114018]
[client.c:2285:client_rpc_notify] 6-el_data-client-1: disconnected from
el_data-client-1. Client process will keep trying to connect to glusterd until
brick's port is available
[2019-01-07 07:40:44.629732] E [MSGID: 108006]
[afr-common.c:5118:__afr_handle_child_down_event] 6-el_data-replicate-0: All
subvolumes are down. Going offline until atleast one of them comes back up.
[2019-01-07 07:40:44.869481] I [glusterfsd-mgmt.c:52:mgmt_cbk_spec] 0-mgmt:
Volume file changed
[2019-01-07 07:40:44.916540] I [glusterfsd-mgmt.c:52:mgmt_cbk_spec] 0-mgmt:
Volume file changed
----

Version-Release number of selected component (if applicable):
3.12.13

How reproducible:
Turn the Read ahead translator "off" on the server side.


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:

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