小记：网上搜了很多fuse挂载hdfs的文档，基本都是坑，要不就是版本太低，要不就是xxxx，很好奇这是为什么。。。试了n多次，一把鼻涕一把泪，终于挂载成功，分享出来，希望大家少走些弯路。。。

环境

1. 安装依赖包

yum -y install lzo-devel zlib-devel gcc gcc-c++ autoconf automake libtool openssl-devel fuse-devel cmake

2. 安装protobuf

wget https://github.com/google/protobuf/releases/download/v2.5.0/protobuf-2.5.0.tar.gz -O protobuf-2.5.0.tar.gz
tar -zxvf protobuf-2.5.0.tar.gz
cd protobuf-2.5.0
./configure --prefix=/opt/protobuf-2.5.0
make && make install

vim /etc/profile
#加入下面一行
export PATH=/opt/protobuf-2.5.0/bin:$PATH

#测试是否安装成功
protoc --version

fuse挂载hdfs

下载hadoop 源码包，这里是hadoop-2.9.1-src.tar.gz

tar -zxvf hadoop-2.9.1-src.tar.gz
cd hadoop-2.9.1-src
#编译本地库，时间灰常的长。。。
mvn package -Pdist,native -DskipTests -Dtar

如果没有安装maven,参照下面：

wget http://mirrors.tuna.tsinghua.edu.cn/apache/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
tar -zxvf apache-maven-3.3.9-bin.tar.gz 
vim /etc/profile
#加入下面两行
M2_HOME=/root/soft/apache-maven-3.3.9 #解压的那个目录
export PATH=${M2_HOME}/bin:${PATH}

source /etc/profile
#测试
mvn -v

漫长等待后，会产生两个重要的文件：

• /root/soft/hadoop-2.9.1-src/hadoop-hdfs-project/hadoop-hdfs-native-client/target/main/native/fuse-dfs
• /root/soft/hadoop-2.9.1-src/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_dfs_wrapper.sh

我们把fuse_dfs_wrapper.sh复制出来，修改一下

#!/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.
#
#新加几个参数
HADOOP_HOME=/opt/hadoop-2.9.1
HADOOP_PREFIX=/root/soft/hadoop-2.9.1-src
HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

if [ "$HADOOP_PREFIX" = "" ]; then
  echo "HADOOP_PREFIX is empty. Set it to the root directory of Hadoop source code"
  exit 1
fi
export FUSEDFS_PATH="$HADOOP_PREFIX/hadoop-hdfs-project/hadoop-hdfs-native-client/target/main/native/fuse-dfs"
#export LIBHDFS_PATH="$HADOOP_PREFIX/hadoop-hdfs-project/hadoop-hdfs-native-client/target/usr/local/lib"
#把上面的改成下面的
export LIBHDFS_PATH="$HADOOP_PREFIX/hadoop-hdfs-project/hadoop-hdfs-native-client/target/native/target/usr/local/lib"

if [ "$OS_ARCH" = "" ]; then
export OS_ARCH=amd64
fi

if [ "$JAVA_HOME" = "" ]; then
export  JAVA_HOME=/usr/local/java
fi

if [ "$LD_LIBRARY_PATH" = "" ]; then
export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/$OS_ARCH/server:/usr/local/lib
fi

while IFS= read -r -d '' file
do
  export CLASSPATH=$CLASSPATH:$file
done < <(find "$HADOOP_PREFIX/hadoop-client" -name "*.jar" -print0)

while IFS= read -r -d '' file
do
  export CLASSPATH=$CLASSPATH:$file
done < <(find "$HADOOP_PREFIX/hadoop-hdfs-project" -name "*.jar" -print0)

export CLASSPATH=$HADOOP_CONF_DIR:$CLASSPATH
export PATH=$FUSEDFS_PATH:$PATH
export LD_LIBRARY_PATH=$LIBHDFS_PATH:$JAVA_HOME/jre/lib/$OS_ARCH/server

fuse_dfs "$@"

最后一步，挂载

mkdir /mnt/fuse_hdfs
./fuse_dfs_wrapper.sh hdfs://namenode:9000 /mnt/fuse_hdfs/

然后就可以看到hdfs里面的数据了

卸载挂载点

umount /mnt/fuse_hdfs