Well if I look at your joiner log then it suggest that things failed while try to fork() wsrep_sst_xtrabackup-v2 ... and error is returned by fork() call so quite likely that memory consumption on your system is bit higher than expected.
I see you have used 18G of buffer pool is that needed ?
Well if I look at your joiner log then it suggest that things failed while try to fork() wsrep_sst_ xtrabackup- v2 ... and error is returned by fork() call so quite likely that memory consumption on your system is bit higher than expected.
I see you have used 18G of buffer pool is that needed ?
How big is your SWAP space and physical RAM ?