win7系统开发hadoop时遇到的问题总结

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/mysqlsocket=/var/lib/mysql/mysql.sockuser=mysql# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-links=0# skip-grant-tables[mysqld_safe]log-error=/var/log/mysqld.logpid-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: trueException 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.SessionHiveMetaStoreClient    at 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.SessionHiveMetaStoreClient    at 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 moreCaused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient    at 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 moreCaused by: java.lang.reflect.InvocationTargetException    at 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 moreCaused 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：

---