Hbase客户端无法连接到远程Hbase服务器 [英] Hbase client can't connect to remote Hbase server

问题描述

我为远程服务器编写了以下hbase客户端类:

i have written a following hbase client class for remote server:

System.out.println("Hbase Demo Application ");

            // CONFIGURATION

                // ENSURE RUNNING
            try {
                HBaseConfiguration config = new HBaseConfiguration();
                config.clear();
                config.set("hbase.zookeeper.quorum", "192.168.15.20");
                config.set("hbase.zookeeper.property.clientPort","2181");
                config.set("hbase.master", "192.168.15.20:60000");
                //HBaseConfiguration config = HBaseConfiguration.create();
    //config.set("hbase.zookeeper.quorum", "localhost");  // Here we are running zookeeper locally
                HBaseAdmin.checkHBaseAvailable(config);


                System.out.println("HBase is running!");
            //  createTable(config);    
                //creating a new table
                HTable table = new HTable(config, "mytable");
                System.out.println("Table mytable obtained ");  
                addData(table);
            } catch (MasterNotRunningException e) {
                System.out.println("HBase is not running!");
                System.exit(1);
            }catch (Exception ce){ ce.printStackTrace();

它抛出了一些异常:

Oct 17, 2011 1:43:54 PM org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation getMaster
INFO: getMaster attempt 0 of 1 failed; no more retrying.
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
    at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404)
    at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:328)
    at org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:883)
    at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:750)
    at org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:257)
    at $Proxy4.getProtocolVersion(Unknown Source)
    at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:419)
    at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:393)
    at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:444)
    at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getMaster(HConnectionManager.java:359)
    at org.apache.hadoop.hbase.client.HBaseAdmin.<init>(HBaseAdmin.java:89)
    at org.apache.hadoop.hbase.client.HBaseAdmin.checkHBaseAvailable(HBaseAdmin.java:1215)
    at com.ifkaar.hbase.HBaseDemo.main(HBaseDemo.java:31)
HBase is not running!

您能告诉我它为什么引发异常，代码有什么问题以及如何解决它.

can you tell me why is it throwing an exception, what is wrong with code and how to solve it.

推荐答案

由于您的HBase服务器的hosts文件而出现此问题.
您只需要编辑HBase服务器的/etc/hosts文件.
从该文件中删除localhost条目，然后将localhost条目放在HBase服务器IP的前面.

This problem is occuring due to your HBase server's hosts file.
You just need to edit you HBase server's /etc/hosts file.
Remove the localhost entry from that file and put the localhost entry in front of HBase server IP.

例如，您的HBase服务器的/etc/hosts文件看起来像这样:

For example, your HBase server's /etc/hosts files seems like this:

127.0.0.1 localhost
192.166.66.66 xyz.hbase.com hbase

您必须通过删除localhost来进行如下更改:

You have to change it like this by removing localhost:

# 127.0.0.1 localhost # line commented out
192.166.66.66 xyz.hbase.com hbase localhost # note: localhost added here

这是因为当远程计算机询问hmaster服务器在何处运行HMaster时，它会告诉它正在localhost上运行.
因此，如果条目是127.0.0.1，则HBase服务器将返回此地址，并且远程计算机将开始在其自己的计算机上(本地)查找HMaster.
当我们使用HBase Server IP进行更改时，一切正常:)

This is because when remote machine asks hbase server machine where HMaster is running, it tells that it is running on localhost.
So if the entry is 127.0.0.1 then HBase server returns this address and remote machine start to find HMaster on its own machine (locally).
When we change that with the HBase Server IP then everything works fine :)

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