Hi,
I upgraded an installation of GlusterFS on Ubuntu 14.04.3 from version 3.4.2 to 3.8.5.
Few hours after the upgrade, I noticed files in "split-brain" state. I never had split-brain files in months of operation before, with the old version.
Using htop, I observed the "glusterfs" process jumping from 0% to 100+% CPU usage every now and then.
Using iostat, I confirmed there is no bottleneck on the local disks (util is well below 10%)
Inspecting the logfiles, it looks like clients are losing connection quite often:
[2016-11-14 16:34:56.685349] C [rpc-clnt-ping.c:160:rpc_clnt_ping_timer_expired] 0-gv0-client-1: server X.X.X.62:49152 has not responded in the last 42 seconds, disconnecting.
[2016-11-14 16:35:47.690348] C [rpc-clnt-ping.c:160:rpc_clnt_ping_timer_expired] 0-gv0-client-8: server X.X.X.219:49153 has not responded in the last 42 seconds, disconnecting.
[2016-11-14 17:09:33.903096] C [rpc-clnt-ping.c:160:rpc_clnt_ping_timer_expired] 0-gv0-client-7: server X.X.X.62:49153 has not responded in the last 42 seconds, disconnecting.
There are a total of 6 servers with 2 bricks each (Distribute-Replicate)
The result of a 60 second gluster volume profile can be seen here: http://pastebin.com/5WN5S63B
After upgrading, I set:
cluster.granular-entry-heal yes
cluster.locking-scheme granular
I now reverted to no/full to see if files are still going "split-brain".
Best regards
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