Can't get connection to ZooKeeper: KeeperErrorCode = ConnectionLoss for /hbase
时间: 2023-12-18 15:31:13 浏览: 57
这个错误通常表示HBase客户端无法连接到ZooKeeper服务器。可能的原因是ZooKeeper服务已经停止运行,网络故障,或者配置错误。您可以检查ZooKeeper服务是否正在运行,以及客户端连接ZooKeeper的配置是否正确。您还可以尝试重启ZooKeeper服务和HBase客户端,以解决这个问题。如果问题仍然存在,您可能需要查看ZooKeeper和HBase客户端的日志,以确定问题的确切原因。
相关问题
hbase 开发:使用java操作hbase
HBase是一个开源、分布式、面向列的NoSQL数据库,可以使用Java API对其进行操作。
首先需要引入HBase的Java API,通常需要添加如下依赖:
```
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.x.x</version>
</dependency>
```
然后可以使用如下代码连接HBase:
```
Configuration config = HBaseConfiguration.create();
config.set("hbase.zookeeper.quorum", "zookeeper_host");
config.set("hbase.zookeeper.property.clientPort", "2181");
Connection connection = ConnectionFactory.createConnection(config);
```
之后可以使用Table和Admin类对HBase进行增删改查操作。
例如:
```
Table table = connection.getTable(TableName.valueOf("table_name"));
Put put = new Put(Bytes.toBytes("row_key"));
put.addColumn(Bytes.toBytes("family"), Bytes.toBytes("qualifier"), Bytes.toBytes("value"));
table.put(put);
```
具体操作可以参考HBase官方文档:https://hbase.apache.org/book.html#_client_apis
[root@zhaosai conf]# sqoop import --connect jdbc:mysql://zhaosai:3306/mydb --username root --password jqe6b6 --table news --target-dir /user/news --fields-terminated-by “;” --hive-import --hive-table news -m 1 Warning: /opt/programs/sqoop-1.4.7.bin__hadoop-2.6.0/../hbase does not exist! HBase imports will fail. Please set $HBASE_HOME to the root of your HBase installation. Warning: /opt/programs/sqoop-1.4.7.bin__hadoop-2.6.0/../hcatalog does not exist! HCatalog jobs will fail. Please set $HCAT_HOME to the root of your HCatalog installation. Warning: /opt/programs/sqoop-1.4.7.bin__hadoop-2.6.0/../accumulo does not exist! Accumulo imports will fail. Please set $ACCUMULO_HOME to the root of your Accumulo installation. Warning: /opt/programs/sqoop-1.4.7.bin__hadoop-2.6.0/../zookeeper does not exist! Accumulo imports will fail. Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation. 23/06/10 16:07:14 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7 23/06/10 16:07:15 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead. 23/06/10 16:07:15 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset. 23/06/10 16:07:15 INFO tool.CodeGenTool: Beginning code generation 23/06/10 16:07:15 ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.RuntimeException: Could not load db driver class: com.mysql.jdbc.Driver java.lang.RuntimeException: Could not load db driver class: com.mysql.jdbc.Driver at org.apache.sqoop.manager.SqlManager.makeConnection(SqlManager.java:875) at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:59) at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:763) at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:786) at org.apache.sqoop.manager.SqlManager.getColumnInfoForRawQuery(SqlManager.java:289) at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:260) at org.apache.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:246) at org.apache.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:327) at org.apache.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1872) at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1671) at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:106) at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:501) at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:628) at org.apache.sqoop.Sqoop.run(Sqoop.java:147) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:183) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:234) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:243) at org.apache.sqoop.Sqoop.main(Sqoop.java:252)
这段代码是使用 Sqoop 工具将 MySQL 数据库中的 news 表导入到 Hadoop 的 HDFS 中,并且使用 Hive 表示,并且在导入过程中使用了分隔符“;”。但是在执行过程中出现了一个异常,提示无法加载数据库驱动类 com.mysql.jdbc.Driver。可能是因为没有将 mysql-connector-java.jar 包添加到 Sqoop 的 classpath 中导致的。需要将该 jar 包添加到 Sqoop 的 lib 目录下,并重新执行该命令。
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