hadoop native： Failed to load/initialize native-bzip2 library system-native

问题描述：

部署完Hadoop之后，执行 hadoop checknative 对本地库做检查：

./bin/hadoop checknative
19/12/06 11:31:39 WARN bzip2.Bzip2Factory: Failed to load/initialize native-bzip2 library system-native, will use pure-Java version
19/12/06 11:31:39 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
Native library checking:
hadoop:  true /home/work/software/hadoop-2.7.2.7/lib/native/libhadoop.so.1.0.0
zlib:    true /lib64/libz.so.1
snappy:  true 
lz4:     true revision:99
bzip2:   false 
openssl: false Cannot load libcrypto.so (libcrypto.so: cannot open shared object file: No such file or directory)!

发现bzip2为false，bizip2的的本地压缩支持无效，整个编译过程没有发现错误，去cenots下的lib64位目录下，查看libbz2的so文件，发现也正常；

ls /lib64/libz.so.1
/lib64/libz.so.1

问题原因：

在编译hadoop时，由于centos系统没有安装bzip2-devel库文件，导致的；

查看编译机bizip2-devel库文件

rpm -qa bzip2-devel  ：  发现没有安装；

问题解决：

安装bzip2-devel库支持，然后重新编译hadoop软件包；

yum install -y  bzip2-devel

编译部署完成后重新验证： 发现已经生效；

./bin/hadoop checknative
19/12/06 11:40:23 INFO bzip2.Bzip2Factory: Successfully loaded & initialized native-bzip2 library system-native
19/12/06 11:40:23 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
Native library checking:
hadoop:  true /home/work/software/hadoop-2.7.2.7/lib/native/libhadoop.so.1.0.0
zlib:    true /lib64/libz.so.1
snappy:  true /home/work/software/hadoop-2.7.2.7/lib/native/libsnappy.so.1
lz4:     true revision:99
bzip2:   true /lib64/libbz2.so.1
openssl: false Cannot load libcrypto.so (libcrypto.so: cannot open shared object file: No such file or directory)!