Thanks Vijay for your response. My env has 2 nodes gluster cluster, and I use replica=2 for a volume. On another node (actually a laptop), I have two scripts, one script will continuously connect to one node of the gluster cluster, and do some read/write operations, if it could not connect to this node, the script will try another node automatically. Another script will login to one node and performing random reboot operations to simulate node down.
After about 1 hour, I got above issue.
Regards,
Yandong