eclipse访问不了hadoop集群文件

org.apache.hadoop.security.AccessControlException: org.apache.hadoop.security .AccessControlException: Permission denied: user=JIN, access=WRITE, inode="root": root:supergroup:rwxr-xr-x
因为linux下是root用户，而window系统开发时，默认用win的用户名去对linux上的hadoop就行读写，就报错权限不足了
办法：
添加环境变量即可

linux装mysql启动失败

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

tmp文件夹下没有mysql.lock，就创建一个类似win的快捷方式的指向就行了
办法：

ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock

MySQL远程连不上

update user set host='%' where user='root';

MySQL忘记root用户密码了

在/etc/my.cnf下加上skip-grant-tables

全部配置：

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# skip-grant-tables
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

然后就可以跳过密码，进入mysql后正常改密码就行

Hive启动失败

报错：

which: no hbase in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.7.0_79/bin:/usr/java/jdk1.7.0_79/jre/bin:/hadoop/hadoop-2.6.0/bin:/apache-hive-2.1.1-bin/bin::/root/bin)
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/apache-hive-2.1.1-bin/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/hadoop/hadoop-2.6.0/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]Logging initialized using configuration in jar:file:/apache-hive-2.1.1-bin/lib/hive-common-2.1.1.jar!/hive-log4j2.properties Async: true
Exception in thread "main" java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClientat org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:591)at org.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionState.java:531)at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:705)at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:641)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.apache.hadoop.util.RunJar.run(RunJar.java:221)at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClientat org.apache.hadoop.hive.ql.metadata.Hive.registerAllFunctionsOnce(Hive.java:226)at org.apache.hadoop.hive.ql.metadata.Hive.<init>(Hive.java:366)at org.apache.hadoop.hive.ql.metadata.Hive.create(Hive.java:310)at org.apache.hadoop.hive.ql.metadata.Hive.getInternal(Hive.java:290)at org.apache.hadoop.hive.ql.metadata.Hive.get(Hive.java:266)at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:558)... 9 more
Caused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClientat org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1654)at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.<init>(RetryingMetaStoreClient.java:80)at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:130)at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:101)at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:3367)at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:3406)at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:3386)at org.apache.hadoop.hive.ql.metadata.Hive.getAllFunctions(Hive.java:3640)at org.apache.hadoop.hive.ql.metadata.Hive.reloadFunctions(Hive.java:236)at org.apache.hadoop.hive.ql.metadata.Hive.registerAllFunctionsOnce(Hive.java:221)... 14 more
Caused by: java.lang.reflect.InvocationTargetExceptionat sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:526)at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1652)... 23 more
Caused by: MetaException(message:Version information not found in metastore. )at org.apache.hadoop.hive.metastore.ObjectStore.checkSchema(ObjectStore.java:7753)at org.apache.hadoop.hive.metastore.ObjectStore.verifySchema(ObjectStore.java:7731)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.apache.hadoop.hive.metastore.RawStoreProxy.invoke(RawStoreProxy.java:101)at com.sun.proxy.$Proxy20.verifySchema(Unknown Source)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMS(HiveMetaStore.java:565)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStore.java:626)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.init(HiveMetaStore.java:416)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:78)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:84)at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:6490)at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.<init>(HiveMetaStoreClient.java:238)at org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.<init>(SessionHiveMetaStoreClient.java:70)... 28 more

首先要保证配置没错，mysql驱动程序也拷贝到了hive的lib下面，如果还保存，就初始化一下hive就可以了

schematool -initSchema -dbType mysql

重新启动：

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