问题描述

集群升级后，hadoop不能正常加载本地库

$ hadoop checknative -a
20/05/08 14:32:11 WARN bzip2.Bzip2Factory: Failed to load/initialize native-bzip2 library system-native, will use pure-Java version
20/05/08 14:32:11 WARN zlib.ZlibFactory: Failed to load/initialize native-zlib library
20/05/08 14:32:11 ERROR snappy.SnappyCompressor: failed to load SnappyCompressor
java.lang.NoSuchFieldError: clazz
        at org.apache.hadoop.io.compress.snappy.SnappyCompressor.initIDs(Native Method)
        at org.apache.hadoop.io.compress.snappy.SnappyCompressor.<clinit>(SnappyCompressor.java:57)
        at org.apache.hadoop.io.compress.SnappyCodec.isNativeCodeLoaded(SnappyCodec.java:82)
        at org.apache.hadoop.util.NativeLibraryChecker.main(NativeLibraryChecker.java:89)
20/05/08 14:32:11 WARN lz4.Lz4Compressor: java.lang.NoSuchFieldError: clazz
Native library checking:
hadoop:  true /home/hadoop/core/jdk/jre/lib/amd64/libhadoop.so
zlib:    false 
snappy:  false 
lz4:     true revision:99
bzip2:   false 
openssl: true /lib64/libcrypto.so
20/05/08 14:32:11 INFO util.ExitUtil: Exiting with status 1

查看旧版本的加载情况

$ cd hadoop-2.7.7/
$ ./bin/hadoop checknative -a
20/05/08 14:34:19 INFO bzip2.Bzip2Factory: Successfully loaded & initialized native-bzip2 library system-native
20/05/08 14:34:19 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
Native library checking:
hadoop:  true /home/hadoop/core/jdk/jre/lib/amd64/libhadoop.so
zlib:    true /lib64/libz.so.1
snappy:  true /home/hadoop/core/hadoop-2.7.7/lib/native/libsnappy.so.1
lz4:     true revision:99
bzip2:   true /lib64/libbz2.so.1
openssl: true /lib64/libcrypto.so

发现旧版本可以加载，但是本地库的路径似乎有所不一样，hadoop的加载到了jdk的目录下，snappy的加载到hadoop目录下

解决办法

根据上面的情况发现，尝试删掉jdk下的库文件

$ mv /home/hadoop/core/jdk/jre/lib/amd64/libhadoop.so /home/hadoop/core/jdk/jre/lib/amd64/libhadoop.so.bak

再次查看，发现可以加载了

$ hadoop checknative -a
20/05/08 14:43:08 INFO bzip2.Bzip2Factory: Successfully loaded & initialized native-bzip2 library system-native
20/05/08 14:43:08 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
Native library checking:
hadoop:  true /opt/beh/core/hadoop/lib/native/libhadoop.so.1.0.0
zlib:    true /lib64/libz.so.1
snappy:  true /opt/beh/core/hadoop/lib/native/libsnappy.so.1
lz4:     true revision:10301
bzip2:   true /lib64/libbz2.so.1
openssl: true /lib64/libcrypto.so