debian 上的 galera 10.3.27。3 个节点，节点 3 已启动（和主节点），其他节点已关闭。sst 方法是 mariabackup。
在节点 1 上，我们可以看到 socat 和 wsrep_sst_maria 正在运行，但什么也没写。mariadb 数据文件夹已清空，工作 1 小时，db >100Gb 但数据文件夹仅包含 galera 缓存（4Gb）+一些日志文件：
-rw-rw---- 1 mysql mysql 607 Mar 3 10:27 GRA_2_700176573_v2.log
-rw-rw---- 1 mysql mysql 659 Mar 3 10:30 GRA_2_700177862_v2.log
-rw-rw---- 1 mysql mysql 804 Mar 3 10:35 GRA_2_700179654_v2.log
-rw-rw---- 1 mysql mysql 217 Mar 8 09:55 gvwstate.dat
-rw-rw---- 1 mysql mysql 0 Mar 8 09:55 sst_in_progress
-rw-rw---- 1 mysql mysql 120 Mar 8 09:55 grastate.dat
drwxr-xr-x 3 mysql mysql 4.0K Mar 8 09:56 .
drwxrwx--x 7 mysql mysql 120 Mar 8 11:33 .sst
-rw------- 1 mysql mysql 3.1G Mar 8 11:40 galera.cache
Mariadb 登录加入者没有显示错误：
Group state: 8ef7bece-c55f-11e8-8e85-1a29ec51b021:705071140
Local state: 8ef7bece-c55f-11e8-8e85-1a29ec51b021:705061467
2021-03-08 9:55:57 2 [Note] WSREP: New cluster view: global state: 8ef7bece-c55f-11e8-8e85-1a29ec51b021:705071140, view# 2: Primary, number of nodes: 2, my index: 0, protocol version 3
2021-03-08 9:55:57 2 [Warning] WSREP: Gap in state sequence. Need state transfer.
2021-03-08 9:55:57 0 [Note] WSREP: Running: 'wsrep_sst_mariabackup --role 'joiner' --address '192.168.15.3' --datadir '/var/lib/mysql/' --parent '19785' --mysqld-args --wsrep_start_position=8ef7bece-c55f-11e8-8e85-1a29ec51b021:705061467
'
WSREP_SST: [INFO] Logging all stderr of SST/Innobackupex to syslog (20210308 09:55:57.531)
2021-03-08 9:55:57 2 [Note] WSREP: Prepared SST request: mariabackup|192.168.15.3:4444/xtrabackup_sst//1
2021-03-08 9:55:57 2 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
2021-03-08 9:55:57 2 [Note] WSREP: REPL Protocols: 9 (4, 2)
2021-03-08 9:55:57 2 [Note] WSREP: Assign initial position for certification: 705071140, protocol version: 4
2021-03-08 9:55:57 0 [Note] WSREP: Service thread queue flushed.
2021-03-08 9:55:57 2 [Note] WSREP: IST receiver addr using tcp://192.168.15.3:4568
2021-03-08 9:55:57 2 [Note] WSREP: Prepared IST receiver, listening at: tcp://192.168.15.3:4568
2021-03-08 9:55:57 0 [Note] WSREP: Member 0.0 (maria1.lan.zetescards.be) requested state transfer from 'maria3.lan.zetescards.be,'. Selected 1.0 (maria3.lan.zetescards.be)(SYNCED) as donor.
2021-03-08 9:55:57 0 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 705071144)
2021-03-08 9:55:57 2 [Note] WSREP: Requesting state transfer: success, donor: 1
2021-03-08 9:55:57 2 [Note] WSREP: GCache history reset: 8ef7bece-c55f-11e8-8e85-1a29ec51b021:0 -> 8ef7bece-c55f-11e8-8e85-1a29ec51b021:705071140
2021-03-08 9:55:59 0 [Note] WSREP: (b39bf6a9, 'tcp://0.0.0.0:4567') connection to peer b39bf6a9 with addr tcp://192.168.15.3:4567 timed out, no messages seen in PT3S
2021-03-08 9:56:00 0 [Note] WSREP: (b39bf6a9, 'tcp://0.0.0.0:4567') turning message relay requesting off
（15.3 是本地节点，15.5=maria3=master 节点）有什么提示吗？