Synced xtrabackup SST fixes from Percona tree (as of PXC 5.6.24-25.11...

Synced xtrabackup SST fixes from Percona tree (as of PXC 5.6.24-25.11 release). This fixes/adresses the following LP bugs:
  - LP1380697: wsrep_sst_xtrabackup-v2 doesn't stop when mysql is SIGKILLed. (full fix for this (as engineeered by Percona) requires Linux-specific patch that we don't carry, but keep xtrabackup scripts as close as possible)
  - LP1399134: Log the innobackupex/SST logs in SST to syslog if possible. (fixed)
  - LP1405668: Race condition between donor and joiner in PXB SST. (fixed)
  - LP1405985: Fail early if xtrabackup_checkkpoints is missing. (fixed)
  - LP1407599: wsrep_sst_xtrabackup-v2 script causes innobackupex to print a false positive stack trace into the log. (fixed)
  - LP1441762: IST Fails with SST script error. (fixed)
  - LP1451670: Fail when move-back fails in xtrabackup SST. (fixed)

scripts/wsrep_sst_common.sh

@@ -19,6 +19,8 @@
 set -u
 
 WSREP_SST_OPT_BYPASS=0
+WSREP_SST_OPT_BINLOG=""
+WSREP_SST_OPT_CONF_SUFFIX=""
 WSREP_SST_OPT_DATA=""
 WSREP_SST_OPT_AUTH=${WSREP_SST_OPT_AUTH:-}
 WSREP_SST_OPT_USER=${WSREP_SST_OPT_USER:-}
@@ -41,6 +43,10 @@ case "$1" in
         readonly WSREP_SST_OPT_CONF="$2"
         shift
         ;;
+    '--defaults-group-suffix')
+        WSREP_SST_OPT_CONF_SUFFIX="$2"
+        shift
+        ;;
     '--host')
         readonly WSREP_SST_OPT_HOST="$2"
         shift
@@ -77,6 +83,10 @@ case "$1" in
         readonly WSREP_SST_OPT_GTID="$2"
         shift
         ;;
+    '--binlog')
+        WSREP_SST_OPT_BINLOG="$2"
+        shift
+        ;;
     *) # must be command
        # usage
        # exit 1
@@ -85,6 +95,8 @@ esac
 shift
 done
 readonly WSREP_SST_OPT_BYPASS
+readonly WSREP_SST_OPT_BINLOG
+readonly WSREP_SST_OPT_CONF_SUFFIX
 
 # try to use my_print_defaults, mysql and mysqldump that come with the sources
 # (for MTR suite)

scripts/wsrep_sst_xtrabackup-v2.sh

@@ -29,6 +29,8 @@ ekeyfile=""
 encrypt=0
 nproc=1
 ecode=0
+ssyslog=""
+ssystag=""
 XTRABACKUP_PID=""
 SST_PORT=""
 REMOTEIP=""
@@ -40,15 +42,15 @@ progress=""
 ttime=0
 totime=0
 lsn=""
-incremental=0
 ecmd=""
 rlimit=""
 # Initially
 stagemsg="${WSREP_SST_OPT_ROLE}"
 cpat=""
-speciald=0
+speciald=1
 ib_home_dir=""
 ib_log_dir=""
+ib_undo_dir=""
 
 sfmt="tar"
 strmcmd=""
@@ -70,6 +72,11 @@ xtmpdir=""
 scomp=""
 sdecomp=""
 
+# Required for backup locks
+# For backup locks it is 1 sent by joiner
+# 5.6.21 PXC and later can't donate to an older joiner
+sst_ver=1
+
 if which pv &>/dev/null && pv --help | grep -q FORMAT;then 
     pvopts+=$pvformat
 fi
@@ -168,7 +175,11 @@ get_transfer()
         fi
         wsrep_log_info "Using netcat as streamer"
         if [[ "$WSREP_SST_OPT_ROLE"  == "joiner" ]];then
+            if nc -h | grep -q ncat;then 
+                tcmd="nc -l ${TSST_PORT}"
+            else 
                 tcmd="nc -dl ${TSST_PORT}"
+            fi
         else
             tcmd="nc ${REMOTEIP} ${TSST_PORT}"
         fi
@@ -252,6 +263,16 @@ get_footprint()
 
 adjust_progress()
 {
+
+    if [[ ! -x `which pv` ]];then 
+        wsrep_log_error "pv not found in path: $PATH"
+        wsrep_log_error "Disabling all progress/rate-limiting"
+        pcmd=""
+        rlimit=""
+        progress=""
+        return
+    fi
+
     if [[ -n $progress && $progress != '1' ]];then 
         if [[ -e $progress ]];then 
             pcmd+=" 2>>$progress"
@@ -281,8 +302,7 @@ read_cnf()
     progress=$(parse_cnf sst progress "")
     rebuild=$(parse_cnf sst rebuild 0)
     ttime=$(parse_cnf sst time 0)
-    cpat=$(parse_cnf sst cpat '.*galera\.cache$\|.*sst_in_progress$\|.*grastate\.dat$\|.*gvwstate\.dat$\|.*\.err$\|.*\.log$\|.*RPM_UPGRADE_MARKER$\|.*RPM_UPGRADE_HISTORY$')
-    incremental=$(parse_cnf sst incremental 0)
+    cpat=$(parse_cnf sst cpat '.*galera\.cache$\|.*sst_in_progress$\|.*\.sst$\|.*gvwstate\.dat$\|.*grastate\.dat$\|.*\.err$\|.*\.log$\|.*RPM_UPGRADE_MARKER$\|.*RPM_UPGRADE_HISTORY$')
     ealgo=$(parse_cnf xtrabackup encrypt "")
     ekey=$(parse_cnf xtrabackup encrypt-key "")
     ekeyfile=$(parse_cnf xtrabackup encrypt-key-file "")
@@ -297,12 +317,26 @@ read_cnf()
         ekeyfile=$(parse_cnf sst encrypt-key-file "")
     fi
     rlimit=$(parse_cnf sst rlimit "")
-    uextra=$(parse_cnf sst use_extra 0)
+    uextra=$(parse_cnf sst use-extra 0)
     speciald=$(parse_cnf sst sst-special-dirs 1)
     iopts=$(parse_cnf sst inno-backup-opts "")
     iapts=$(parse_cnf sst inno-apply-opts "")
     impts=$(parse_cnf sst inno-move-opts "")
     stimeout=$(parse_cnf sst sst-initial-timeout 100)
+    ssyslog=$(parse_cnf sst sst-syslog 0)
+    ssystag=$(parse_cnf mysqld_safe syslog-tag "${SST_SYSLOG_TAG:-}")
+    ssystag+="-"
+
+    if [[ $speciald -eq 0 ]];then 
+        wsrep_log_error "sst-special-dirs equal to 0 is not supported, falling back to 1"
+        speciald=1
+    fi 
+
+    if [[ $ssyslog -ne -1 ]];then 
+        if my_print_defaults -c $WSREP_SST_OPT_CONF mysqld_safe | tr '_' '-' | grep -q -- "--syslog";then 
+            ssyslog=1
+        fi
+    fi
 }
 
 get_stream()
@@ -346,8 +380,7 @@ cleanup_joiner()
     local estatus=$?
     if [[ $estatus -ne 0 ]];then 
         wsrep_log_error "Cleanup after exit with status:$estatus"
-    fi
-    if [ "${WSREP_SST_OPT_ROLE}" = "joiner" ];then
+    elif [ "${WSREP_SST_OPT_ROLE}" = "joiner" ];then
         wsrep_log_info "Removing the sst_in_progress file"
         wsrep_cleanup_progress_file
     fi
@@ -358,6 +391,23 @@ cleanup_joiner()
     if [[ -n ${STATDIR:-} ]];then 
        [[ -d $STATDIR ]] && rm -rf $STATDIR
     fi
+
+    # Final cleanup 
+    pgid=$(ps -o pgid= $$ | grep -o '[0-9]*')
+
+    # This means no setsid done in mysqld.
+    # We don't want to kill mysqld here otherwise.
+    if [[ $$ -eq $pgid ]];then
+
+        # This means a signal was delivered to the process.
+        # So, more cleanup. 
+        if [[ $estatus -ge 128 ]];then 
+            kill -KILL -$$ || true
+        fi
+
+    fi
+
+    exit $estatus
 }
 
 check_pid()
@@ -398,6 +448,24 @@ cleanup_donor()
     if [[ -n $itmpdir ]];then 
        [[ -d $itmpdir ]] &&  rm -rf $itmpdir || true
     fi
+
+    # Final cleanup 
+    pgid=$(ps -o pgid= $$ | grep -o '[0-9]*')
+
+    # This means no setsid done in mysqld.
+    # We don't want to kill mysqld here otherwise.
+    if [[ $$ -eq $pgid ]];then
+
+        # This means a signal was delivered to the process.
+        # So, more cleanup. 
+        if [[ $estatus -ge 128 ]];then 
+            kill -KILL -$$ || true
+        fi
+
+    fi
+
+    exit $estatus
+
 }
 
 kill_xtrabackup()
@@ -414,6 +482,7 @@ setup_ports()
         SST_PORT=$(echo $WSREP_SST_OPT_ADDR | awk -F '[:/]' '{ print $2 }')
         REMOTEIP=$(echo $WSREP_SST_OPT_ADDR | awk -F ':' '{ print $1 }')
         lsn=$(echo $WSREP_SST_OPT_ADDR | awk -F '[:/]' '{ print $4 }')
+        sst_ver=$(echo $WSREP_SST_OPT_ADDR | awk -F '[:/]' '{ print $5 }')
     else
         SST_PORT=$(echo ${WSREP_SST_OPT_ADDR} | awk -F ':' '{ print $2 }')
     fi
@@ -431,11 +500,7 @@ wait_for_listen()
         ss -p state listening "( sport = :$PORT )" | grep -qE 'socat|nc' && break
         sleep 0.2
     done
-    if [[ $incremental -eq 1 ]];then 
-        echo "ready ${ADDR}/${MODULE}/$lsn"
-    else 
-        echo "ready ${ADDR}/${MODULE}"
-    fi
+    echo "ready ${ADDR}/${MODULE}//$sst_ver"
 }
 
 check_extra()
@@ -443,7 +508,7 @@ check_extra()
     local use_socket=1
     if [[ $uextra -eq 1 ]];then 
         if $MY_PRINT_DEFAULTS -c $WSREP_SST_OPT_CONF mysqld | tr '_' '-' | grep -- "--thread-handling=" | grep -q 'pool-of-threads';then 
-            local eport=$($MY_PRINT_DEFAULTS -c $WSREP_SST_OPT_CONF mysqld | tr '_' '-' | grep -- "--extra-port=" | cut -d= -f2)
+            local eport=$(my_print_defaults -c $WSREP_SST_OPT_CONF mysqld | tr '_' '-' | grep -- "--extra-port=" | cut -d= -f2)
             if [[ -n $eport ]];then 
                 # Xtrabackup works only locally.
                 # Hence, setting host to 127.0.0.1 unconditionally. 
@@ -468,8 +533,14 @@ recv_joiner()
     local dir=$1
     local msg=$2 
     local tmt=$3
+    local checkf=$4
     local ltcmd
 
+    if [[ ! -d ${dir} ]];then
+        # This indicates that IST is in progress
+        return
+    fi
+
     pushd ${dir} 1>/dev/null
     set +e
 
@@ -477,7 +548,7 @@ recv_joiner()
         if timeout --help | grep -q -- '-k';then 
             ltcmd="timeout -k $(( tmt+10 )) $tmt $tcmd"
         else 
-            ltcmd="timeout $tmt $tcmd"
+            ltcmd="timeout -s9 $tmt $tcmd"
         fi
         timeit "$msg" "$ltcmd | $strmcmd; RC=( "\${PIPESTATUS[@]}" )"
     else 
@@ -500,7 +571,7 @@ recv_joiner()
         fi
     done
 
-    if [ ! -r "${MAGIC_FILE}" ];then
+    if [[ $checkf -eq 1 && ! -r "${MAGIC_FILE}" ]];then
         # this message should cause joiner to abort
         wsrep_log_error "xtrabackup process ended without creating '${MAGIC_FILE}'"
         wsrep_log_info "Contents of datadir" 
@@ -546,18 +617,52 @@ fi
 
 read_cnf
 setup_ports
-get_stream
-get_transfer
 
-if ${INNOBACKUPEX_BIN} /tmp --help  | grep -- '--version-check' >/dev/null ; then 
+if ${INNOBACKUPEX_BIN} /tmp --help 2>/dev/null | grep -q -- '--version-check'; then 
     disver="--no-version-check"
 fi
 
+if [[ ${FORCE_FTWRL:-0} -eq 1 ]];then 
+    wsrep_log_info "Forcing FTWRL due to environment variable FORCE_FTWRL equal to $FORCE_FTWRL"
+    iopts+=" --no-backup-locks "
+fi
+
 
 INNOEXTRA=""
-INNOAPPLY="${INNOBACKUPEX_BIN} $disver $iapts --apply-log \$rebuildcmd \${DATA} &>\${DATA}/innobackup.prepare.log"
-INNOMOVE="${INNOBACKUPEX_BIN} --defaults-file=${WSREP_SST_OPT_CONF} $disver $impts  --move-back --force-non-empty-directories \${DATA} &>\${DATA}/innobackup.move.log"
-INNOBACKUP="${INNOBACKUPEX_BIN} --defaults-file=${WSREP_SST_OPT_CONF} $disver $iopts \$tmpopts \$INNOEXTRA --galera-info --stream=\$sfmt \$itmpdir 2>\${DATA}/innobackup.backup.log"
+
+if [[ $ssyslog -eq 1 ]];then 
+
+    if [[ ! -x `which logger` ]];then 
+        wsrep_log_error "logger not in path: $PATH. Ignoring"
+    else
+
+        wsrep_log_info "Logging all stderr of SST/Innobackupex to syslog"
+
+        exec 2> >(logger -p daemon.err -t ${ssystag}wsrep-sst-$WSREP_SST_OPT_ROLE)
+
+        wsrep_log_error()
+        {
+            logger  -p daemon.err -t ${ssystag}wsrep-sst-$WSREP_SST_OPT_ROLE "$@" 
+        }
+
+        wsrep_log_info()
+        {
+            logger  -p daemon.info -t ${ssystag}wsrep-sst-$WSREP_SST_OPT_ROLE "$@" 
+        }
+
+        INNOAPPLY="${INNOBACKUPEX_BIN} $disver $iapts --apply-log \$rebuildcmd \${DATA} 2>&1  | logger -p daemon.err -t ${ssystag}innobackupex-apply "
+        INNOMOVE="${INNOBACKUPEX_BIN} --defaults-file=${WSREP_SST_OPT_CONF} $disver $impts  --move-back --force-non-empty-directories \${DATA} 2>&1 | logger -p daemon.err -t ${ssystag}innobackupex-move "
+        INNOBACKUP="${INNOBACKUPEX_BIN} --defaults-file=${WSREP_SST_OPT_CONF} $disver $iopts \$tmpopts \$INNOEXTRA --galera-info --stream=\$sfmt \$itmpdir 2> >(logger -p daemon.err -t ${ssystag}innobackupex-backup)"
+    fi
+
+else 
+    INNOAPPLY="${INNOBACKUPEX_BIN} $disver $iapts --apply-log \$rebuildcmd \${DATA} &>\${DATA}/innobackup.prepare.log"
+    INNOMOVE="${INNOBACKUPEX_BIN} --defaults-file=${WSREP_SST_OPT_CONF}  --defaults-group=mysqld${WSREP_SST_OPT_CONF_SUFFIX} $disver $impts  --move-back --force-non-empty-directories \${DATA} &>\${DATA}/innobackup.move.log"
+    INNOBACKUP="${INNOBACKUPEX_BIN} --defaults-file=${WSREP_SST_OPT_CONF}  --defaults-group=mysqld${WSREP_SST_OPT_CONF_SUFFIX} $disver $iopts \$tmpopts \$INNOEXTRA --galera-info --stream=\$sfmt \$itmpdir 2>\${DATA}/innobackup.backup.log"
+fi
+
+get_stream
+get_transfer
 
 if [ "$WSREP_SST_OPT_ROLE" = "donor" ]
 then
@@ -565,6 +670,11 @@ then
 
     if [ $WSREP_SST_OPT_BYPASS -eq 0 ]
     then
+        if [[ -z $sst_ver ]];then 
+            wsrep_log_error "Upgrade joiner to 5.6.21 or higher for backup locks support"
+            wsrep_log_error "The joiner is not supported for this version of donor"
+            exit 93
+        fi
 
         if [[ -z $(parse_cnf mysqld tmpdir "") && -z $(parse_cnf xtrabackup tmpdir "") ]];then 
             xtmpdir=$(mktemp -d)
@@ -596,9 +706,6 @@ then
             fi
         fi
 
-        if [[ -n $lsn ]];then 
-                INNOEXTRA+=" --incremental --incremental-lsn=$lsn "
-        fi
 
         check_extra
 
@@ -686,29 +793,12 @@ then
     [[ -e $SST_PROGRESS_FILE ]] && wsrep_log_info "Stale sst_in_progress file: $SST_PROGRESS_FILE"
     [[ -n $SST_PROGRESS_FILE ]] && touch $SST_PROGRESS_FILE
 
-    if [[ $speciald -eq 1 ]];then 
-        wsrep_log_info "WARNING: sst-special-dirs feature requires PXC 2.1.6 or latter."
-    fi
-
-    if [[ $speciald -eq 1 ]];then 
     ib_home_dir=$(parse_cnf mysqld innodb-data-home-dir "")
     ib_log_dir=$(parse_cnf mysqld innodb-log-group-home-dir "")
-        if [[ -z $ib_home_dir && -z $ib_log_dir ]];then 
-            speciald=0
-        fi
-    fi
+    ib_undo_dir=$(parse_cnf mysqld innodb-undo-directory "")
 
     stagemsg="Joiner-Recv"
 
-    if [[ ! -e ${DATA}/ibdata1 ]];then 
-        incremental=0
-    fi
-
-    if [[ $incremental -eq 1 ]];then 
-        wsrep_log_info "Incremental SST enabled: NOT SUPPORTED yet"
-        lsn=$(grep to_lsn xtrabackup_checkpoints | cut -d= -f2 | tr -d ' ')
-        wsrep_log_info "Recovered LSN: $lsn"
-    fi
 
     sencrypted=1
     nthreads=1
@@ -737,12 +827,6 @@ then
         tcmd+=" | $pcmd"
     fi
 
-    if [[ $incremental -eq 1 ]];then 
-        BDATA=$DATA
-        DATA=$(mktemp -d)
-        MAGIC_FILE="${DATA}/${INFO_FILE}"
-    fi
-
     get_keys
     if [[ $encrypt -eq 1 && $sencrypted -eq 1 ]];then
         if [[ -n $sdecomp ]];then 
@@ -756,7 +840,8 @@ then
 
     STATDIR=$(mktemp -d)
     MAGIC_FILE="${STATDIR}/${INFO_FILE}"
-    recv_joiner $STATDIR  "${stagemsg}-gtid" $stimeout
+    recv_joiner $STATDIR  "${stagemsg}-gtid" $stimeout 1
+
 
     if ! ps -p ${WSREP_SST_OPT_PARENT} &>/dev/null
     then
@@ -766,20 +851,19 @@ then
 
     if [ ! -r "${STATDIR}/${IST_FILE}" ]
     then
-        wsrep_log_info "Proceeding with SST"
 
-        if [[ $speciald -eq 1 && -d ${DATA}/.sst ]];then 
-            wsrep_log_info "WARNING: Stale temporary SST directory: ${DATA}/.sst from previous SST"
+        if [[ -d ${DATA}/.sst ]];then
+            wsrep_log_info "WARNING: Stale temporary SST directory: ${DATA}/.sst from previous state transfer"
         fi
+        mkdir -p ${DATA}/.sst
+        (recv_joiner $DATA/.sst "${stagemsg}-SST" 0 0) &
+        jpid=$!
+        wsrep_log_info "Proceeding with SST"
+
 
-        if [[ $incremental -ne 1 ]];then 
-            if [[ $speciald -eq 1 ]];then 
         wsrep_log_info "Cleaning the existing datadir and innodb-data/log directories"
-                find $ib_home_dir $ib_log_dir $DATA -mindepth 1  -regex $cpat  -prune  -o -exec rm -rfv {} 1>&2 \+
-            else 
-                wsrep_log_info "Cleaning the existing datadir"
-                find $DATA -mindepth 1  -regex $cpat  -prune  -o -exec rm -rfv {} 1>&2 \+
-            fi
+        find $ib_home_dir $ib_log_dir $ib_undo_dir $DATA -mindepth 1  -regex $cpat  -prune  -o -exec rm -rfv {} 1>&2 \+
+
         tempdir=$(parse_cnf mysqld log-bin "")
         if [[ -n ${tempdir:-} ]];then
             binlog_dir=$(dirname $tempdir)
@@ -787,29 +871,28 @@ then
             if [[ -n ${binlog_dir:-} && $binlog_dir != '.' && $binlog_dir != $DATA ]];then
                 pattern="$binlog_dir/$binlog_file\.[0-9]+$"
                 wsrep_log_info "Cleaning the binlog directory $binlog_dir as well"
-                    find $binlog_dir -maxdepth 1 -type f -regex $pattern -exec rm -fv {} 1>&2 \+
+                find $binlog_dir -maxdepth 1 -type f -regex $pattern -exec rm -fv {} 1>&2 \+ || true
                 rm $binlog_dir/*.index || true
             fi
         fi
 
-        else
-            wsrep_log_info "Removing existing ib_logfile files"
-            rm -f ${BDATA}/ib_logfile*
-        fi
 
 
-        if [[ $speciald -eq 1 ]];then 
-            mkdir -p ${DATA}/.sst
         TDATA=${DATA}
         DATA="${DATA}/.sst"
-        fi
 
 
         MAGIC_FILE="${DATA}/${INFO_FILE}"
-        recv_joiner $DATA "${stagemsg}-SST" 0
+        wsrep_log_info "Waiting for SST streaming to complete!"
+        wait $jpid
 
         get_proc
 
+        if [[ ! -s ${DATA}/xtrabackup_checkpoints ]];then 
+            wsrep_log_error "xtrabackup_checkpoints missing, failed innobackupex/SST on donor"
+            exit 2
+        fi
+
         # Rebuild indexes for compact backups
         if grep -q 'compact = 1' ${DATA}/xtrabackup_checkpoints;then 
             wsrep_log_info "Index compaction detected"
@@ -864,12 +947,24 @@ then
             fi
         fi
 
-        if [[ $incremental -eq 1 ]];then 
-            # Added --ibbackup=xtrabackup_55 because it fails otherwise citing connection issues.
-            INNOAPPLY="${INNOBACKUPEX_BIN} --defaults-file=${WSREP_SST_OPT_CONF} \
-                --ibbackup=xtrabackup_55 --apply-log $rebuildcmd --redo-only $BDATA --incremental-dir=${DATA} &>>${BDATA}/innobackup.prepare.log"
+
+        if  [[ ! -z $WSREP_SST_OPT_BINLOG ]];then
+
+            BINLOG_DIRNAME=$(dirname $WSREP_SST_OPT_BINLOG)
+            BINLOG_FILENAME=$(basename $WSREP_SST_OPT_BINLOG)
+
+            # To avoid comparing data directory and BINLOG_DIRNAME 
+            mv $DATA/${BINLOG_FILENAME}.* $BINLOG_DIRNAME/ 2>/dev/null || true
+
+            pushd $BINLOG_DIRNAME &>/dev/null
+            for bfiles in $(ls -1 ${BINLOG_FILENAME}.*);do
+                echo ${BINLOG_DIRNAME}/${bfiles} >> ${BINLOG_FILENAME}.index
+            done
+            popd &> /dev/null
+
         fi
 
+
         wsrep_log_info "Preparing the backup at ${DATA}"
         timeit "Xtrabackup prepare stage" "$INNOAPPLY"
 
@@ -879,7 +974,6 @@ then
             exit 22
         fi
 
-        if [[ $speciald -eq 1 ]];then 
         MAGIC_FILE="${TDATA}/${INFO_FILE}"
         set +e
         rm $TDATA/innobackup.prepare.log $TDATA/innobackup.move.log
@@ -893,14 +987,9 @@ then
         else 
             wsrep_log_error "Move failed, keeping ${DATA} for further diagnosis"
             wsrep_log_error "Check ${DATA}/innobackup.move.log for details"
-            fi
+            exit 22
         fi
 
-        if [[ $incremental -eq 1 ]];then 
-            wsrep_log_info "Cleaning up ${DATA} after incremental SST"
-            [[ -d ${DATA} ]] && rm -rf ${DATA}
-            DATA=$BDATA
-        fi
 
     else 
         wsrep_log_info "${IST_FILE} received from donor: Running IST"
@@ -910,6 +999,7 @@ then
         wsrep_log_error "SST magic file ${MAGIC_FILE} not found/readable"
         exit 2
     fi
+    wsrep_log_info "Galera co-ords from recovery: $(cat ${MAGIC_FILE})"
     cat "${MAGIC_FILE}" # output UUID:seqno
     wsrep_log_info "Total time on joiner: $totime seconds"
 fi

scripts/wsrep_sst_xtrabackup.sh

@@ -149,7 +149,11 @@ get_transfer()
         fi
         wsrep_log_info "Using netcat as streamer"
         if [[ "$WSREP_SST_OPT_ROLE"  == "joiner" ]];then
+            if nc -h | grep -q ncat;then 
+                tcmd="nc -l ${TSST_PORT}"
+            else 
                 tcmd="nc -dl ${TSST_PORT}"
+            fi
         else
             tcmd="nc ${REMOTEIP} ${TSST_PORT}"
         fi