hbase连接被拒绝了

Question

我是HBase和Hadoop的新手.我已经完全设置了HBase并且开始完美.现在,当我尝试使用Java客户端从p1连接到HBase(其中HBase设置在p2上)时,它会抛出一个奇怪的异常.

12/04/17 14:36:37 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=192.168.15.20:2181 sessionTimeout=180000 watcher=hconnection
12/04/17 14:36:38 INFO zookeeper.ClientCnxn: Opening socket connection to server /192.168.15.20:2181
12/04/17 14:36:38 WARN zookeeper.ClientCnxn: Session 0x0 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:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:39 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:39 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:41 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:41 WARN zookeeper.ClientCnxn: Session 0x0 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:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:43 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:43 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:44 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:44 WARN zookeeper.ClientCnxn: Session 0x0 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:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:45 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:45 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:47 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:47 WARN zookeeper.ClientCnxn: Session 0x0 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:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:48 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:48 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1119)
12/04/17 14:36:49 INFO zookeeper.ClientCnxn: Opening socket connection to server hbase.local/192.168.15.20:2181
12/04/17 14:36:49 INFO zookeeper.ZooKeeper: Session: 0x0 closed
org.apache.hadoop.hbase.ZooKeeperConnectionException: HBase is able to connect to ZooKeeper but the connection closes immediately. This could be a sign that the server has too many connections (30 is the default). Consider inspecting your ZK server logs for that error and then make sure you are reusing HBaseConfiguration as often as you can. See HTable's javadoc for more information.
    at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:155)
    at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getZooKeeperWatcher(HConnectionManager.java:1002)
    at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.setupZookeeperTrackers(HConnectionManager.java:304)
    at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:295)
    at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:157)
    at org.apache.hadoop.hbase.client.HBaseAdmin.<init>(HBaseAdmin.java:90)
    at org.apache.hadoop.hbase.client.HBaseAdmin.checkHBaseAvailable(HBaseAdmin.java:1258)
    at HBaseDemo.main(HBaseDemo.java:55)
Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase
    at org.apache.zookeeper.KeeperException.create(KeeperException.java:90)
    at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
    at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:809)
    at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:837)
    at org.apache.hadoop.hbase.zookeeper.ZKUtil.createAndFailSilent(ZKUtil.java:903)
    at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:133)
    ... 7 more
12/04/17 14:36:49 INFO zookeeper.ClientCnxn: EventThread shut down
Execution script exiting 

---

/04/17 17:41:35 INFO zookeeper.ZooKeeper: Client environment:user.name=xyz
12/04/17 17:41:35 INFO zookeeper.ZooKeeper: Client environment:user.home=/home/xyz
12/04/17 17:41:35 INFO zookeeper.ZooKeeper: Client environment:user.dir=/opt/xyz/hbase-sample
12/04/17 17:41:35 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=192.168.15.169:2181 sessionTimeout=180000 watcher=hconnection
12/04/17 17:41:35 INFO zookeeper.ClientCnxn: Opening socket connection to server /192.168.15.169:2181
12/04/17 17:41:35 INFO zookeeper.ClientCnxn: Socket connection established to hbase.xyz.com/192.168.15.169:2181, initiating session
12/04/17 17:41:35 INFO zookeeper.ClientCnxn: Session establishment complete on server hbase.xyz.com/192.168.15.169:2181, sessionid = 0x136c00d59ac0009, negotiated timeout = 180000
12/04/17 17:41:36 INFO client.HConnectionManager$HConnectionImplementation: getMaster attempt 0 of 1 failed; no more retrying.
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:604)
at org.apache.hadoop.hbase.ipc.HBaseClient$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:360)
at org.apache.hadoop.hbase.client.HBaseAdmin.<init>(HBaseAdmin.java:94)
at org.apache.hadoop.hbase.client.HBaseAdmin.checkHBaseAvailable(HBaseAdmin.java:1258)
at HBaseDemo.main(HBaseDemo.java:55)
HBase is not running!
Execution script exiting 

Answer 1

我找到了解决方案.

只需删除我的localhost条目/etc/hosts.现在我的localhost条目类似于192.169.19.50 [这是我的hbase IP] = localhost而不是127.0.0.1 localhost.

Answer 2

此处接受的答案可能有效，但仅作为副作用。

问题是 HBase 正在打开一个端口侦听本地主机（即环回）而不是面向外部的接口。删除 /etc/hosts 中的 localhost 条目会强制 HBase 绑定到外部接口——但这只是因为它找不到 localhost。当某些守护进程想要合法地侦听或单独连接到本地主机（通过 lo）时，这可能会成为一个问题。

您可以通过使用 telnet 通过 localhost 或分配给机器的 IP 连接到端口 60000 来测试您是否有此问题。您很可能可以通过 localhost 连接（因为这是 HBase 绑定的地方）而不是 IP。

最好在 HBase conf 中使用您的机器名称。