HBase报错：java.net.ConnectException: Connection refused

HBase Standalone安装与启动问题

最新推荐文章于 2022-06-20 22:38:14 发布

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本文描述了在Standalone模式下安装HBase遇到的问题及解决方法，主要问题是Hadoop连接被拒绝导致Zookeeper连接失败。解决方案包括检查并配置Hadoop环境变量，确保hbase-site.xml文件正确无误。

问题描述：

standalone模式安装HBase，安装步骤参考：http://archive.cloudera.com/cdh5/cdh/5/hbase-0.98.6-cdh5.3.3/book/quickstart.html

启动HBase，查看日志信息发现报错，错误大致意思为Hadoop连接拒绝，或者由此导致zookeeper连接拒绝

报错信息：

2015-12-29 10:25:21,165 FATAL [M:0;hadoop-yarn:46823] master.HMaster: Unhandled exception. Starting shutdown.java.net.ConnectException: Call From hadoop-yarn.cloudyhadoop.com/192.168.1.20 to localhost:8020 failed on connection exception:

java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused

Caused by: java.net.ConnectException: Connection refused

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)

at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)

at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:529)

at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:493)

at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:606)

at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:700)

at org.apache.hadoop.ipc.Client$Connection.access$2800(Client.java:367)

at org.apache.hadoop.ipc.Client.getConnection(Client.java:1463)

at org.apache.hadoop.ipc.Client.call(Client.java:1382)

2015-12-29 10:25:22,685 WARN [RS:0;hadoop-yarn:47199-SendThread(localhost:2181)] zookeeper.ClientCnxn: Session 0x151eb8db6de0001 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: Connection refused

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)

at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)

at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

解决方案：

若/etc/profile未配置hadoop环境，需要在conf/hbase-env.sh 配置hadoop环境变量：

export HADOOP_HOME=/opt/modules/hadoop-2.5.0-cdh5.3.3

或者由于hbase-site.xml配置文件出现语法错误，hadoop的share/hadoop多包或缺包。