Comment 4 for bug 1443154

The variable $sst_ver is zero.

677 if [[ -z $sst_ver ]];then
678 wsrep_log_error "Upgrade joiner to 5.6.21 or higher for backup locks support"
679 wsrep_log_error "The joiner is not supported for this version of donor"
680 exit 93
681 fi

$set_ver is set by

  483 setup_ports()
  484 {
  485 if [[ "$WSREP_SST_OPT_ROLE" == "donor" ]];then
  486 SST_PORT=$(echo $WSREP_SST_OPT_ADDR | awk -F '[:/]' '{ print $2 }')
  487 REMOTEIP=$(echo $WSREP_SST_OPT_ADDR | awk -F ':' '{ print $1 }')
  488 lsn=$(echo $WSREP_SST_OPT_ADDR | awk -F '[:/]' '{ print $4 }')
  489 sst_ver=$(echo $WSREP_SST_OPT_ADDR | awk -F '[:/]' '{ print $5 }')
  490 else
  491 SST_PORT=$(echo ${WSREP_SST_OPT_ADDR} | awk -F ':' '{ print $2 }')
  492 fi
  493 }