hbase/bin/rolling-restart.sh

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#!/usr/bin/env bash
#
#/**
# * Copyright 2007 The Apache Software Foundation
# *
# * Licensed to the Apache Software Foundation (ASF) under one
# * or more contributor license agreements. See the NOTICE file
# * distributed with this work for additional information
# * regarding copyright ownership. The ASF licenses this file
# * to you under the Apache License, Version 2.0 (the
# * "License"); you may not use this file except in compliance
# * with the License. You may obtain a copy of the License at
# *
# * http://www.apache.org/licenses/LICENSE-2.0
# *
# * 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.
# */
#
# Run a shell command on all regionserver hosts.
#
# Environment Variables
#
# HBASE_REGIONSERVERS File naming remote hosts.
# Default is ${HADOOP_CONF_DIR}/regionservers
# HADOOP_CONF_DIR Alternate conf dir. Default is ${HADOOP_HOME}/conf.
# HBASE_CONF_DIR Alternate hbase conf dir. Default is ${HBASE_HOME}/conf.
# HADOOP_SLAVE_SLEEP Seconds to sleep between spawning remote commands.
# HADOOP_SLAVE_TIMEOUT Seconds to wait for timing out a remote command.
# HADOOP_SSH_OPTS Options passed to ssh when running remote commands.
#
# Modelled after $HADOOP_HOME/bin/slaves.sh.
usage="Usage: $0 [--config <hbase-confdir>] commands..."
bin=`dirname "$0"`
bin=`cd "$bin">/dev/null; pwd`
. "$bin"/hbase-config.sh
# start hbase daemons
errCode=$?
if [ $errCode -ne 0 ]
then
exit $errCode
fi
# quick function to get a value from the HBase config file
distMode=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool hbase.cluster.distributed`
if [ "$distMode" == 'false' ]; then
"$bin"/hbase-daemon.sh restart master
else
# stop all masters before re-start to avoid races for master znode
"$bin"/hbase-daemon.sh --config "${HBASE_CONF_DIR}" stop master
"$bin"/hbase-daemons.sh --config "${HBASE_CONF_DIR}" \
--hosts "${HBASE_BACKUP_MASTERS}" stop master-backup
# make sure the master znode has been deleted before continuing
zparent=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool zookeeper.znode.parent`
if [ "$zparent" == "null" ]; then zparent="/hbase"; fi
zmaster=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool zookeeper.znode.master`
if [ "$zmaster" == "null" ]; then zmaster="master"; fi
zmaster=$zparent/$zmaster
echo -n "Waiting for Master ZNode ${zmaster} to expire"
while bin/hbase zkcli stat $zmaster >/dev/null 2>&1; do
echo -n "."
sleep 1
done
echo #force a newline
# all masters are down, now restart
"$bin"/hbase-daemon.sh --config "${HBASE_CONF_DIR}" start master
"$bin"/hbase-daemons.sh --config "${HBASE_CONF_DIR}" \
--hosts "${HBASE_BACKUP_MASTERS}" start master-backup
echo "Wait a minute for master to come up join cluster"
sleep 60
# Master joing cluster will start in cleaning out regions in transition.
# Wait until the master has cleaned out regions in transition before
# giving it a bunch of work to do; master is vulnerable during startup
zunassigned=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool zookeeper.znode.unassigned`
if [ "$zunassigned" == "null" ]; then zunassigned="unassigned"; fi
zunassigned="$zparent/$zunassigned"
echo -n "Waiting for ${zunassigned} to empty"
while true ; do
unassigned=`$bin/hbase zkcli stat ${zunassigned} 2>&1 |grep -e 'numChildren = '|sed -e 's,numChildren = ,,'`
if test 0 -eq ${unassigned}
then
break
else
echo -n " ${unassigned}"
fi
sleep 1
done
# unlike the masters, roll all regionservers one-at-a-time
export HBASE_SLAVE_PARALLEL=false
"$bin"/hbase-daemons.sh --config "${HBASE_CONF_DIR}" \
--hosts "${HBASE_REGIONSERVERS}" restart regionserver
fi