start-hbase.sh 阅读解析

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本文介绍了一个用于启动HBase集群的Shell脚本，并提供了详细的步骤来运行此脚本以启动Master、RegionServer和Zookeeper组件。

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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.

# */





# Modelled after $HADOOP_HOME/bin/start-hbase.sh.





# Start hadoop hbase daemons.

# Run this on master node.

usage="Usage: start-hbase.sh"





bin=`dirname "${BASH_SOURCE-$0}"`

bin=`cd "$bin">/dev/null; pwd`





. "$bin"/hbase-config.sh





# start hbase daemons

errCode=$?

if [ $errCode -ne 0 ]

then

  exit $errCode

fi









if [ "$1" = "autorestart" ]

then

  commandToRun="autorestart"

else 

  commandToRun="start"

fi





# HBASE-6504 - only take the first line of the output in case verbose gc is on

distMode=`$bin/hbase --config "$HBASE_CONF_DIR" org.apache.hadoop.hbase.util.HBaseConfTool hbase.cluster.distributed | head -n 1`









if [ "$distMode" == 'false' ] 

then

  "$bin"/hbase-daemon.sh $commandToRun master $@

else

  "$bin"/hbase-daemons.sh --config "${HBASE_CONF_DIR}" $commandToRun zookeeper

  "$bin"/hbase-daemon.sh --config "${HBASE_CONF_DIR}" $commandToRun master 

  "$bin"/hbase-daemons.sh --config "${HBASE_CONF_DIR}" \

    --hosts "${HBASE_REGIONSERVERS}" $commandToRun regionserver

  "$bin"/hbase-daemons.sh --config "${HBASE_CONF_DIR}" \

    --hosts "${HBASE_BACKUP_MASTERS}" $commandToRun master-backup

fi








#感觉下面的java代码好简单啊。 只不过
# HBASE-6504 - only take the first line of the output in case verbose gc is on

distMode=`$bin/hbase --config "$HBASE_CONF_DIR" org.apache.hadoop.hbase.util.HBaseConfTool hbase.cluster.distributed | head -n 1`


#这段代码貌似很简单

* 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这个
* 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
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*/

package org.apache.hadoop.hbase.util;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;

/**
* Tool that prints out a configuration.
* Pass the configuration key on the command-line.
*/
@InterfaceAudience.Private
public class HBaseConfTool {
public static void main(String args[]) {
if (args.length < 1) {
System.err.println("Usage: HBaseConfTool <CONFIGURATION_KEY>");
System.exit(1);
return;
}

Configuration conf = HBaseConfiguration.create();
System.out.println(conf.get(args[0]));
}
}