ahh

init.sh

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

#
# Starts a Hadoop HDFS DataNode
#
# chkconfig: 345 85 15
# description: Starts a Hadoop HDFS DataNode
# processname: java
#
### BEGIN INIT INFO
# Provides:          hadoop-hdfs-datanode
# Required-Start:    $syslog $remote_fs
# Should-Start:
# Required-Stop:     $syslog $remote_fs
# Should-Stop:
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 6
# Short-Description: Starts a Hadoop HDFS DataNode
### END INIT INFO

. /lib/lsb/init-functions
[ -f /etc/default/hadoop ] && . /etc/default/hadoop

# Autodetect JAVA_HOME if not defined
if [ -e /usr/libexec/bigtop-detect-javahome ]; then
  . /usr/libexec/bigtop-detect-javahome
elif [ -e /usr/lib/bigtop-utils/bigtop-detect-javahome ]; then
  . /usr/lib/bigtop-utils/bigtop-detect-javahome
fi
[ -f /etc/profile.d/jdk.sh ] && . /etc/profile.d/jdk.sh

RETVAL_SUCCESS=0

STATUS_RUNNING=0
STATUS_DEAD=1
STATUS_DEAD_AND_LOCK=2
STATUS_NOT_RUNNING=3
STATUS_DEBIAN_NOT_RUNNING=4
STATUS_OTHER_ERROR=102

ERROR_PROGRAM_NOT_INSTALLED=5
ERROR_PROGRAM_NOT_CONFIGURED=6

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
NAME="hadoop-hdfs-datanode"
DESC="Hadoop HDFS DataNode"
SYS_FILE="/etc/default/${NAME}"

[ -f ${SYS_FILE} ] && SOURCE=". ${SYS_FILE};" && . ${SYS_FILE}

LOG_FILE="${HADOOP_LOG_DIR}/hadoop-hdfs-datanode.log"
PKG_USER="hdfs"
PKG_HOME="/usr/lib/hadoop"
CONF_DIR="${HADOOP_CONF_DIR}"

[ -f ${CONF_DIR}/${NAME}-env.sh ] && . ${CONF_DIR}/${NAME}-env.sh

PID_FILE="${HADOOP_PID_DIR}/hadoop-hdfs-datanode.pid"
EXE_FILE="/usr/lib/hadoop/sbin/hadoop-daemon.sh"
EXE_ARGS="--config ${CONF_DIR} start datanode"
LOCKFILE="/var/lock/hadoop-hdfs-datanode"

NICENESS="+0"
TIMEOUT=3

_start() {
    [ -x ${EXE_FILE} ] || exit ${ERROR_PROGRAM_NOT_INSTALLED}

    log_success_msg "Starting ${DESC} (${NAME}): "

    mkdir -p `dirname ${PID_FILE}` `dirname ${LOG_FILE}`
    chown ${PKG_USER} `dirname ${PID_FILE}` `dirname ${LOG_FILE}`
    su -s /bin/bash ${PKG_USER} -c "cd ${PKG_HOME}; ${SOURCE} exec nice -n ${NICENESS} ${EXE_FILE} ${EXE_ARGS}& echo \$! > ${PID_FILE}"

    RETVAL=$?
    [ ${RETVAL} -eq ${RETVAL_SUCCESS} ] && touch ${LOCKFILE}
    return ${RETVAL}
}

_stop() {
    log_success_msg "Stopping ${DESC} (${NAME}): "
    killproc -p ${PID_FILE} java
    RETVAL=$?

    [ ${RETVAL} -eq ${RETVAL_SUCCESS} ] && rm -f ${LOCKFILE} ${PID_FILE}
    return ${RETVAL}
}

_restart() {
    _stop
    [ -n "${TIMEOUT}" ] && sleep ${TIMEOUT}
    _start
}

_status() {
    echo -n "Checking for service ${DESC}: "
    pidofproc -p ${PID_FILE} java > /dev/null
    RETVAL=$?

    case ${RETVAL} in
      ${STATUS_RUNNING})
        log_success_msg "${NAME} is running"
        ;;
      ${STATUS_DEAD})
        log_failure_msg "${NAME} is dead and pid file exists"
        ;;
      ${STATUS_DEAD_AND_LOCK})
        log_failure_msg "${NAME} is dead and lock file exists"
        ;;
      ${STATUS_NOT_RUNNING}|${STATUS_DEBIAN_NOT_RUNNING})
        log_failure_msg "${NAME} is not running"
        ;;
      *)
        log_failure_msg "${NAME} status is unknown"
        ;;
    esac
    return ${RETVAL}
}

RETVAL=0

case ${1} in
    start) _start ;;

    stop|force-stop) _stop ;;

    force-reload|condrestart|try-restart) [ -e $LOCKFILE ] && _restart || : ;;

    restart|reload) _restart ;;

    status) _status ;;

    *)
        N=/etc/init.d/${NAME}
        echo "Usage: ${N} {start|stop|restart|reload|condrestart|try-restart|force-reload|status|force-stop}" >&2
        RETVAL=1
        ;;
esac

exit ${RETVAL}