Specified key was too long; max key length is 767 bytes

启动hive后运行:SHOW TABLES 报错

hive> show tables;
FAILED: Error in metadata: MetaException(message:Got exception: javax.jdo.JDODataStoreException An exception was thrown while adding/validating class(es) : Specified key was too long; max key length is 767 bytes
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Specified key was too long; max key length is 767 bytes
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
        at com.mysql.jdbc.Connection.execSQL(Connection.java:3170)
        at com.mysql.jdbc.Connection.execSQL(Connection.java:3099)
        at com.mysql.jdbc.Statement.execute(Statement.java:695)
        at org.apache.commons.dbcp.DelegatingStatement.execute(DelegatingStatement.java:264)
        at org.apache.commons.dbcp.DelegatingStatement.execute(DelegatingStatement.java:264)
        at org.datanucleus.store.rdbms.table.AbstractTable.executeDdlStatement(AbstractTable.java:730)
        at org.datanucleus.store.rdbms.table.AbstractTable.executeDdlStatementList(AbstractTable.java:681)
        at org.datanucleus.store.rdbms.table.AbstractTable.create(AbstractTable.java:402)
        at org.datanucleus.store.rdbms.table.AbstractTable.exists(AbstractTable.java:458)
        at org.datanucleus.store.rdbms.RDBMSStoreManager$ClassAdder.performTablesValidation(RDBMSStoreManager.java:2689)
        at org.datanucleus.store.rdbms.RDBMSStoreManager$ClassAdder.addClassTablesAndValidate(RDBMSStoreManager.java:2503)
        at org.datanucleus.store.rdbms.RDBMSStoreManager$ClassAdder.run(RDBMSStoreManager.java:2148)
        at org.datanucleus.store.rdbms.AbstractSchemaTransaction.execute(AbstractSchemaTransaction.java:113)
        at org.datanucleus.store.rdbms.RDBMSStoreManager.addClasses(RDBMSStoreManager.java:986)
        at org.datanucleus.store.rdbms.RDBMSStoreManager.addClasses(RDBMSStoreManager.java:952)
        at org.datanucleus.store.AbstractStoreManager.addClass(AbstractStoreManager.java:919)
        at org.datanucleus.store.mapped.MappedStoreManager.getDatastoreClass(MappedStoreManager.java:356)
        at org.datanucleus.store.rdbms.query.legacy.ExtentHelper.getExtent(ExtentHelper.java:48)
        at org.datanucleus.store.rdbms.RDBMSStoreManager.getExtent(RDBMSStoreManager.java:1332)
        at org.datanucleus.ObjectManagerImpl.getExtent(ObjectManagerImpl.java:4149)
        at org.datanucleus.store.rdbms.query.legacy.JDOQLQueryCompiler.compileCandidates(JDOQLQueryCompiler.java:411)
        at org.datanucleus.store.rdbms.query.legacy.QueryCompiler.executionCompile(QueryCompiler.java:312)
        at org.datanucleus.store.rdbms.query.legacy.JDOQLQueryCompiler.compile(JDOQLQueryCompiler.java:225)
        at org.datanucleus.store.rdbms.query.legacy.JDOQLQuery.compileInternal(JDOQLQuery.java:175)
        at org.datanucleus.store.query.Query.executeQuery(Query.java:1628)
        at org.datanucleus.store.rdbms.query.legacy.JDOQLQuery.executeQuery(JDOQLQuery.java:245)
        at org.datanucleus.store.query.Query.executeWithArray(Query.java:1499)
        at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:243)
        at org.apache.hadoop.hive.metastore.ObjectStore.getTables(ObjectStore.java:747)
        at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler$30.run(HiveMetaStore.java:1735)
        at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler$30.run(HiveMetaStore.java:1732)
        at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.executeWithRetry(HiveMetaStore.java:307)
        at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.get_tables(HiveMetaStore.java:1732)
        at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.getTables(HiveMetaStoreClient.java:698)
        at org.apache.hadoop.hive.ql.metadata.Hive.getTablesByPattern(Hive.java:918)
        at org.apache.hadoop.hive.ql.metadata.Hive.getAllTables(Hive.java:892)
        at org.apache.hadoop.hive.ql.exec.DDLTask.showTables(DDLTask.java:1721)
        at org.apache.hadoop.hive.ql.exec.DDLTask.execute(DDLTask.java:289)
        at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:131)
        at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
        at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1063)
        at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:900)
        at org.apache.hadoop.hive.ql.Driver.run(Driver.java:748)
        at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:209)
        at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:286)
        at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:516)
        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:601)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
)
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask

问题是数据库的字符集问题

解决方法：

alter database hive character set latin1;