I want to use a gluster replication volume for sqlite db storage However, when the '.db' file is updated, LINUX does not detect the change, so synchronization between bricks is not possible.
Is there a way to force sync? It is not synchronized even if you use the gluster volume heal command.
< My Gluster volume status >
[root@be-k8s-worker-1 common]# gluster volume create sync_test replica 2 transport tcp 10.XX.XX.X1:/home/common/sync_test 10.XX.XX.X2:/home/common/sync_test
Replica 2 volumes are prone to split-brain. Use Arbiter or Replica 3 to avoid this. See: http://docs.gluster.org/en/latest/Administrator%20Guide/Split%20brain%20and%20ways%20to%20deal%20with%20it/.
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(y/n) y
volume create: sync_test: success: please start the volume to access data
[root@be-k8s-worker-1 common]# gluster volume start sync_test
volume start: sync_test: success
[root@be-k8s-worker-1 sync_test]# gluster volume status sync_test
Status of volume: sync_test
Gluster process TCP Port RDMA Port Online Pid
------------------------------------------------------------------------------
Brick 10.XX.XX.X1:/home/common/sync_test 49155 0 Y 1142
Brick 10.XX.XX.X2:/home/common/sync_test 49155 0 Y 2134
Self-heal Daemon on localhost N/A N/A Y 2612
Self-heal Daemon on 10.XX.XX.X1 N/A N/A Y 4257
Task Status of Volume sync_test
------------------------------------------------------------------------------
There are no active volume tasks
< Problem Case >
[root@be-k8s-worker-1 sync_test]# ls -al ## client 1
total 20
drwxrwxrwx. 4 root root 122 Oct 17 10:51 .
drwx------. 8 sbyun domain users 4096 Oct 17 10:50 ..
-rw-r--r--. 1 root root 0 Oct 17 10:35 test
-rwxr--r--. 1 sbyun domain users 16384 Oct 17 10:52 test.d
[root@be-k8s-worker-1 sync_test2]# ls -al ## client2
total 20
drwxrwxrwx. 4 root root 122 Oct 17 10:51 .
drwx------. 8 sbyun domain users 4096 Oct 17 10:50 ..
-rw-r--r--. 1 root root 0 Oct 17 10:35 test
-rwxr--r--. 1 sbyun domain users 16384 Oct 17 10:52 test.db
## diff -> No result
[root@be-k8s-worker-1 user]# diff sync_test/test.db sync_test2/test.db
But if I compare same file in windows compare on windows
My SQLite database was set to WAL mode. So the wal file was being updated and the .db file was not immediately synced.
I turned off WAL Mode with this command:
PRAGMA journal_mode=DELETE;
I confirmed that it was synced immediately.
According to Sqlite document, It doesn't work over a network file system.
All processes using a database must be on the same host computer; WAL does not work over a network filesystem.