dcs/bin/master-backup.sh

#!/usr/bin/env bash
#/**
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#
# Licensed to the Apache Software Foundation (ASF) under one
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# Run a shell command on all backup master hosts.
#
# Environment Variables
#
#   DCS_MASTERS File for specifying all DcsMaster hosts
#     Default is ${DCS_CONF_DIR}/masters
#   DCS_CONF_DIR  Alternate Dcs conf dir. Default is ${DCS_HOME}/conf.
#   DCS_SLAVE_SLEEP Seconds to sleep between spawning remote commands.
#   DCS_SSH_OPTS Options passed to ssh when running remote commands.
#
# Modelled after $HADOOP_HOME/bin/slaves.sh.

usage="Usage: $0 [--config <dcs-confdir>] command..."

# if no args specified, show usage
if [ $# -le 0 ]; then
  echo $usage
  exit 1
fi

bin=`dirname "${BASH_SOURCE-$0}"`
bin=`cd "$bin">/dev/null; pwd`

. "$bin"/dcs-config.sh

activeMaster=$($DCS_INSTALL_DIR/bin/getActiveMaster.sh)

args=${@// /\\ }
args=${args/master-backup/master}

instance=2

if [ -f ${DCS_INSTALL_DIR}/conf/masters ]; then
  while read master
  do
    if [[ ! -z $activeMaster && "$master" =~ $activeMaster ]]; then
      echo "$activeMaster is the current active DcsMaster"
    else
      L_PDSH="ssh -q -n $DCS_SSH_OPTS"
      if ${DCS_SLAVE_PARALLEL:-true}; then
        ${L_PDSH} $master $"$args $instance"\
          2>&1 | sed "s/^/$master: /" &
      else # run each command serially
        ${L_PDSH} $master $"$args $instance" \
          2>&1 | sed "s/^/$master: /" 
      fi
    fi 
    if [ "$DCS_SLAVE_SLEEP" != "" ]; then
      sleep $DCS_SLAVE_SLEEP
    fi
  
    let instance++

  done < "${DCS_INSTALL_DIR}/conf/masters"
fi

wait