三、Unable to load native-hadoop library for your platform... using builtin-java classes where appl...
hadoop安裝完成後，找些教程想看看hdfs命令使用，發現不管用什麼老報下面這個警告：
WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable。
1、檢視日誌資訊，找尋報錯原因；
$ export HADOOP_ROOT_LOGGER=DEBUG,console # 輸出日誌
$ hadoop fs ls /
顯示日誌資訊：
18/04/29 21:38:44 DEBUG util.Shell: setsid exited with exit code 0
18/04/29 21:38:44 DEBUG conf.Configuration: parsing URL jar:file:/usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar!/core-default.xml
18/04/29 21:38:44 DEBUG conf.Configuration: parsing input stream sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream@54b24c03
18/04/29 21:38:44 DEBUG conf.Configuration: parsing URL file:/usr/local/hadoop-2.9.0/etc/hadoop/core-site.xml
18/04/29 21:38:44 DEBUG conf.Configuration: parsing input stream java.io.BufferedInputStream@7bc9a682
18/04/29 21:38:44 DEBUG core.Tracer: sampler.classes = ; loaded no samplers
18/04/29 21:38:44 DEBUG core.Tracer: span.receiver.classes = ; loaded no span receivers
18/04/29 21:38:45 DEBUG lib.MutableMetricsFactory: field org.apache.hadoop.metrics2.lib.MutableRate org.apache.hadoop.security.UserGroupInformation$UgiMetrics.loginSuccess with annotation @org.apache.hadoop.metrics2.annotation.Metric(value=[Rate of successful kerberos logins and latency (milliseconds)], about=, valueName=Time, type=DEFAULT, always=false, sampleName=Ops)
18/04/29 21:38:45 DEBUG lib.MutableMetricsFactory: field org.apache.hadoop.metrics2.lib.MutableRate org.apache.hadoop.security.UserGroupInformation$UgiMetrics.loginFailure with annotation @org.apache.hadoop.metrics2.annotation.Metric(value=[Rate of failed kerberos logins and latency (milliseconds)], about=, valueName=Time, type=DEFAULT, always=false, sampleName=Ops)
18/04/29 21:38:45 DEBUG lib.MutableMetricsFactory: field org.apache.hadoop.metrics2.lib.MutableRate org.apache.hadoop.security.UserGroupInformation$UgiMetrics.getGroups with annotation @org.apache.hadoop.metrics2.annotation.Metric(value=[GetGroups], about=, valueName=Time, type=DEFAULT, always=false, sampleName=Ops)
18/04/29 21:38:45 DEBUG lib.MutableMetricsFactory: field private org.apache.hadoop.metrics2.lib.MutableGaugeLong org.apache.hadoop.security.UserGroupInformation$UgiMetrics.renewalFailuresTotal with annotation @org.apache.hadoop.metrics2.annotation.Metric(value=[Renewal failures since startup], about=, valueName=Time, type=DEFAULT, always=false, sampleName=Ops)
18/04/29 21:38:45 DEBUG lib.MutableMetricsFactory: field private org.apache.hadoop.metrics2.lib.MutableGaugeInt org.apache.hadoop.security.UserGroupInformation$UgiMetrics.renewalFailures with annotation @org.apache.hadoop.metrics2.annotation.Metric(value=[Renewal failures since last successful login], about=, valueName=Time, type=DEFAULT, always=false, sampleName=Ops)
18/04/29 21:38:45 DEBUG impl.MetricsSystemImpl: UgiMetrics, User and group related metrics
18/04/29 21:38:45 DEBUG security.SecurityUtil: Setting hadoop.security.token.service.use_ip to true
18/04/29 21:38:45 DEBUG security.Groups: Creating new Groups object
18/04/29 21:38:45 DEBUG util.NativeCodeLoader: Trying to load the custom-built native-hadoop library...
18/04/29 21:38:45 DEBUG util.NativeCodeLoader: Failed to load native-hadoop with error: java.lang.UnsatisfiedLinkError: /usr/local/hadoop-2.9.0/lib/native/libhadoop.so.1.0.0: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by /usr/local/hadoop-2.9.0/lib/native/libhadoop.so.1.0.0)
18/04/29 21:38:45 DEBUG util.NativeCodeLoader: java.library.path=/usr/local/hadoop-2.9.0/lib/native
18/04/29 21:38:45 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
18/04/29 21:38:45 DEBUG util.PerformanceAdvisory: Falling back to shell based
18/04/29 21:38:45 DEBUG security.JniBasedUnixGroupsMappingWithFallback: Group mapping impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping
18/04/29 21:38:45 DEBUG security.Groups: Group mapping impl=org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback; cacheTimeout=300000; warningDeltaMs=5000
18/04/29 21:38:45 DEBUG security.UserGroupInformation: hadoop login
18/04/29 21:38:45 DEBUG security.UserGroupInformation: hadoop login commit
18/04/29 21:38:45 DEBUG security.UserGroupInformation: using local user:UnixPrincipal: hadoop
18/04/29 21:38:45 DEBUG security.UserGroupInformation: Using user: "UnixPrincipal: hadoop" with name hadoop
18/04/29 21:38:45 DEBUG security.UserGroupInformation: User entry: "hadoop"
18/04/29 21:38:45 DEBUG security.UserGroupInformation: Assuming keytab is managed externally since logged in from subject.
18/04/29 21:38:45 DEBUG security.UserGroupInformation: UGI loginUser:hadoop (auth:SIMPLE)
18/04/29 21:38:45 DEBUG core.Tracer: sampler.classes = ; loaded no samplers
18/04/29 21:38:45 DEBUG core.Tracer: span.receiver.classes = ; loaded no span receivers
18/04/29 21:38:45 DEBUG fs.FileSystem: Loading filesystems
18/04/29 21:38:45 DEBUG fs.FileSystem: file:// = class org.apache.hadoop.fs.LocalFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: viewfs:// = class org.apache.hadoop.fs.viewfs.ViewFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: ftp:// = class org.apache.hadoop.fs.ftp.FTPFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: har:// = class org.apache.hadoop.fs.HarFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: http:// = class org.apache.hadoop.fs.http.HttpFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: https:// = class org.apache.hadoop.fs.http.HttpsFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/common/hadoop-common-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: hdfs:// = class org.apache.hadoop.hdfs.DistributedFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/hdfs/lib/hadoop-hdfs-client-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: webhdfs:// = class org.apache.hadoop.hdfs.web.WebHdfsFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/hdfs/lib/hadoop-hdfs-client-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: swebhdfs:// = class org.apache.hadoop.hdfs.web.SWebHdfsFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/hdfs/lib/hadoop-hdfs-client-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: hftp:// = class org.apache.hadoop.hdfs.web.HftpFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/hdfs/lib/hadoop-hdfs-client-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: hsftp:// = class org.apache.hadoop.hdfs.web.HsftpFileSystem from /usr/local/hadoop-2.9.0/share/hadoop/hdfs/lib/hadoop-hdfs-client-2.9.0.jar
18/04/29 21:38:46 DEBUG fs.FileSystem: Looking for FS supporting hdfs
18/04/29 21:38:46 DEBUG fs.FileSystem: looking for configuration option fs.hdfs.impl
18/04/29 21:38:46 DEBUG fs.FileSystem: Looking in service filesystems for implementation class
18/04/29 21:38:46 DEBUG fs.FileSystem: FS for hdfs is class org.apache.hadoop.hdfs.DistributedFileSystem
18/04/29 21:38:46 DEBUG impl.DfsClientConf: dfs.client.use.legacy.blockreader.local = false
18/04/29 21:38:46 DEBUG impl.DfsClientConf: dfs.client.read.shortcircuit = false
18/04/29 21:38:46 DEBUG impl.DfsClientConf: dfs.client.domain.socket.data.traffic = false
18/04/29 21:38:46 DEBUG impl.DfsClientConf: dfs.domain.socket.path =
18/04/29 21:38:46 DEBUG hdfs.DFSClient: Sets dfs.client.block.write.replace-datanode-on-failure.min-replication to 0
18/04/29 21:38:46 DEBUG retry.RetryUtils: multipleLinearRandomRetry = null
18/04/29 21:38:46 DEBUG ipc.Server: rpcKind=RPC_PROTOCOL_BUFFER, rpcRequestWrapperClass=class org.apache.hadoop.ipc.ProtobufRpcEngine$RpcProtobufRequest, rpcInvoker=org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker@4977b5
18/04/29 21:38:46 DEBUG ipc.Client: getting client out of cache: org.apache.hadoop.ipc.Client@42583a89
18/04/29 21:38:47 DEBUG util.PerformanceAdvisory: Both short-circuit local reads and UNIX domain socket are disabled.
18/04/29 21:38:47 DEBUG sasl.DataTransferSaslUtil: DataTransferProtocol not using SaslPropertiesResolver, no QOP found in configuration for dfs.data.transfer.protection
18/04/29 21:38:47 DEBUG ipc.Client: The ping interval is 60000 ms.
18/04/29 21:38:47 DEBUG ipc.Client: Connecting to master/192.168.181.170:9000
18/04/29 21:38:47 DEBUG ipc.Client: IPC Client (136930299) connection to master/192.168.181.170:9000 from hadoop: starting, having connections 1
18/04/29 21:38:47 DEBUG ipc.Client: IPC Client (136930299) connection to master/192.168.181.170:9000 from hadoop sending #0 org.apache.hadoop.hdfs.protocol.ClientProtocol.getFileInfo
18/04/29 21:38:47 DEBUG ipc.Client: IPC Client (136930299) connection to master/192.168.181.170:9000 from hadoop got value #0
18/04/29 21:38:47 DEBUG ipc.ProtobufRpcEngine: Call: getFileInfo took 97ms
18/04/29 21:38:47 DEBUG ipc.Client: IPC Client (136930299) connection to master/192.168.181.170:9000 from hadoop sending #1 org.apache.hadoop.hdfs.protocol.ClientProtocol.getListing
18/04/29 21:38:47 DEBUG ipc.Client: IPC Client (136930299) connection to master/192.168.181.170:9000 from hadoop got value #1
18/04/29 21:38:47 DEBUG ipc.ProtobufRpcEngine: Call: getListing took 8ms
18/04/29 21:38:47 DEBUG ipc.Client: stopping client from cache: org.apache.hadoop.ipc.Client@42583a89
18/04/29 21:38:47 DEBUG ipc.Client: removing client from cache: org.apache.hadoop.ipc.Client@42583a89
18/04/29 21:38:47 DEBUG ipc.Client: stopping actual client because no more references remain: org.apache.hadoop.ipc.Client@42583a89
18/04/29 21:38:47 DEBUG ipc.Client: Stopping client
18/04/29 21:38:47 DEBUG ipc.Client: IPC Client (136930299) connection to master/192.168.181.170:9000 from hadoop: closed
18/04/29 21:38:47 DEBUG ipc.Client: IPC Client (136930299) connection to master/192.168.181.170:9000 from hadoop: stopped, remaining connections 0
18/04/29 21:38:47 DEBUG util.ShutdownHookManager: ShutdownHookManger complete shutdown.
發現報錯說glibc-2.14版本找不到（被我框出的紅色部分）。
$ strings /lib64/libc.so.6 | grep GLIBC # 檢視系統支援的版本，最高到2.12版本。
2、下載解壓glibc-2.14版本；
2）解壓到任意路徑下，我的解壓路徑/usr/local；
$ sudo tar -zxf ~/Downloads/hadoop-2.9.0.tar.gz -C /usr/local
2、在glibc原始碼目錄下構建目錄
$ cd glibc-2.14
$ mkdir build
$ cd build
3、執行configure配置,安裝；
$ ../configure --prefix=/opt/glibc-2.14
$ sudo make -j4 # 這個時間可能稍微長些
$ sudo make install
4、配置
$ cp /etc/ld.so.c* /opt/glibc-2.14/etc/
cp: omitting directory `/etc/ld.so.conf.d'
$ sudo ln -sf /opt/glibc-2.14/lib/libc-2.14.so /lib64/libc.so.6
5、檢視版本庫的支援；
$ strings /lib64/libc.so.6 | grep GLIBC
參考連結：
https://www.cnblogs.com/likui360/p/6558749.html
https://blog.csdn.net/niying/article/details/42491557
https://www.cnblogs.com/erygreat/p/7223829.html
http://www.powerxing.com/install-hadoop-in-centos/