1、warning：Unable to load realm info from SCDynamicStore 两种方式： （1）在~/bash_profile中添加 export HADOOP_OPTS=”-Djava.security.krb5.realm= -Djava.security.krb5.kdc=” （This works on Java 6, but not on Java 7） 如果是java 7：In the hadoop-env.sh file, change the JAVA_HOME setting to

export JAVA_HOME=`/usr/libexec/java_home -v 1.6`

 如果hbase遇到这个问题，则把上述设置加入conf/hbase-env.sh  （2）修改 <HADOOP_HOME>/etc/hadoop/hadoop-env.sh export JAVA_HOME=$(/usr/libexec/java_home -d 64 -v 1.6) export HADOOP_OPTS="$HADOOP_OPTS -Djava.security.krb5.realm=OX.AC.UK -Djava.security.krb5.kdc=kdc0.ox.ac.uk:kdc1.ox.ac.uk" 2、warning：WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable 原因：编译的64bits hadoop 2.2.0中没有lib。解决方法：在core-site.xml中添加 io.native.lib.available false default value is true:Should native hadoop libraries, if present, be used. 经测试，上述方法没用。。原因：however it looks like it only affects zlib. Since we always load the native library this means we may use native libraries even if io.native.lib.available is set to false.参考https://issues.apache.org/jira/browse/HADOOP-8642解决该问题（就是修改源代码，然后再重新编译就行了）