hadoop namenode无法启动解决方案

简而言之就是先关闭集群再删除hadoop中所有数据然后再初始化namenode（初始化前先启动zookeeper和journalnode）在启动hadoop

个人笔记：启动zookeeper的shell（通过主机登录其他节点机逐个启动zookeeper）

注：这几个shell是为了方便自己使用hadoop写的。如果是为了解决问题那就是删除数据在初始化namenode，再`start-all.sh`就可以了

#!/bin/bash
path=$(pwd)
cd /usr/zookeeper/bin
sh zkServer.sh start


ssh -Tq root@slave1 <<eeooff
cd /usr/zookeeper/bin
sh zkServer.sh start

exit
eeooff


ssh -Tq root@slave2 <<eeooff
cd /usr/zookeeper/bin
sh zkServer.sh start

exit
eeooff
cd $path

关闭zookeeper的shell（通过主机登录其他节点机逐个关闭zookeeper）

#!/bin/bash
path=$(pwd)
cd /usr/zookeeper/bin
sh zkServer.sh stop


ssh -Tq root@slave1 <<eeooff
cd /usr/zookeeper/bin
sh zkServer.sh stop

exit
eeooff


ssh -Tq root@slave2 <<eeooff
cd /usr/zookeeper/bin
sh zkServer.sh stop

exit
eeooff

cd $path

重置hadoop

逐台删除tmp下namenode、datanode、和nm*（这个文件具体的忘了只记得以nm开头）中的数据，还有清除日志（logs下的文件）以及journalnode下的文件。
注：删除所有的数据，这样就跟刚刚配置好的一样集群一样需要初始化。
删除之后先启动每台主机的zookeeper，然后再主机（master）上启动journalnode,然后初始化namenode（hadoop namenode -format）

#!/bin/bash
path=$(pwd)
stop-all.sh
cd /usr/hadoop/hadoop-2.9.2
rm -rf tmp/namenode/* tmp/datanode/* tmp/nm*
rm -rf logs/*
rm -rf journal/*

ssh -Tq root@slave1 <<eeooff
cd /usr/hadoop/hadoop-2.9.2
rm -rf tmp/namenode/* tmp/datanode/* tmp/nm*
rm -rf logs/*
rm -rf journal/*
exit
eeooff

ssh  -Tq root@slave2 <<eeooff
cd /usr/hadoop/hadoop-2.9.2
rm -rf tmp/namenode/* tmp/datanode/* tmp/nm*
rm -rf logs/*
rm -rf journal/*
exit
eeooff
echo "主机和节点机的数据删除成功！"
cd /usr/zookeeper/bin
./starpAll.sh
echo "启动zookeeper(shell启动3台)"
cd /usr/hadoop/hadoop-2.9.2/sbin
./hadoop-daemon.sh start journalnode
./hadoop-daemons.sh start journalnode
echo "启动journalnode"
hadoop namenode -format
echo "初始化成功！可以直接启动！"

小技巧

为了方便启动集群所以我在start-all.sh（该文件在hadoop的sbin目录下）中添加了上面写的启动zookeeper集群的shell和启动hbase、spark的启动shell。（直接vi start-all.sh 添加即可）

!/usr/bin/env bash

# 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.
path=$(pwd)
cd /usr/zookeeper/bin
./startAll.sh
cd /usr/hadoop/hadoop-2.9.2/sbin
# Start all hadoop daemons.  Run this on master node.

echo "This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh"

bin=`dirname "${BASH_SOURCE-$0}"`
bin=`cd "$bin"; pwd`

DEFAULT_LIBEXEC_DIR="$bin"/../libexec
HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
. $HADOOP_LIBEXEC_DIR/hadoop-config.sh

# start hdfs daemons if hdfs is present
if [ -f "${HADOOP_HDFS_HOME}"/sbin/start-dfs.sh ]; then
  "${HADOOP_HDFS_HOME}"/sbin/start-dfs.sh --config $HADOOP_CONF_DIR
fi

# start yarn daemons if yarn is present
if [ -f "${HADOOP_YARN_HOME}"/sbin/start-yarn.sh ]; then
  "${HADOOP_YARN_HOME}"/sbin/start-yarn.sh --config $HADOOP_CONF_DIR
fi

cd /usr/hbase/bin
./start-hbase.sh

cd /usr/spark/sbin
./start-all.sh

cd $path

关闭stop-all.sh

#!/usr/bin/env bash

# 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.
path=$(pwd)



#cd /usr/hbase/bin
#./stop-hbase.sh

#cd /usr/spark/sbin
#./stop-all.sh



# Stop all hadoop daemons.  Run this on master node.

echo "This script is Deprecated. Instead use stop-dfs.sh and stop-yarn.sh"

bin=`dirname "${BASH_SOURCE-$0}"`
bin=`cd "$bin"; pwd`

DEFAULT_LIBEXEC_DIR="$bin"/../libexec
HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
. $HADOOP_LIBEXEC_DIR/hadoop-config.sh

# stop hdfs daemons if hdfs is present
if [ -f "${HADOOP_HDFS_HOME}"/sbin/stop-dfs.sh ]; then
  "${HADOOP_HDFS_HOME}"/sbin/stop-dfs.sh --config $HADOOP_CONF_DIR
fi

# stop yarn daemons if yarn is present
if [ -f "${HADOOP_HDFS_HOME}"/sbin/stop-yarn.sh ]; then
  "${HADOOP_HDFS_HOME}"/sbin/stop-yarn.sh --config $HADOOP_CONF_DIR
fi

#path=$(pwd)
#cd /usr/zookeeper/bin
#./stopAll.sh



#cd $path