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POmulti node cassandra installation ended with "UnknownHostException"
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copied!<p>I am newbie to Cassandra. I wanted to install cassandra-0.8.4 on 3 nodes and to run Map/Reduce job that uploads data from HDFS to Cassandra.</p> <p>I have installed Cassnadra on 3 nodes lab02(199.168.0.2),lab03(199.168.0.3) & lab04(199.168.0.4) respectively and can create a keyspace & column family and they got distributed across the cluster.</p> <p>When I run my map/reduce program it ended up with "UnknownHostException". the same map/reduce program works well on single node cluster.</p> <p>Here are the steps which I have followed.</p> <ol> <li>cassandra.yaml details</li> </ol> <blockquote> <p>lab02(199.168.0.2): (seed node)</p> <p>auto_bootstrap: false seeds: "199.168.0.2" listen_address: 199.168.0.2 rpc_address: 199.168.0.2</p> <p>lab03(199.168.0.3): auto_bootstrap: true seeds: "199.168.0.2" listen_address: 199.168.0.3 rpc_address: 199.168.0.3</p> <p>lab04(199.168.0.4): auto_bootstrap: true seeds: "199.168.0.2" listen_address: 199.168.0.4 rpc_address: 199.168.0.4</p> </blockquote> <p>2. When I run my map/reduce program it ended up with "UnknownHostException"</p> <p>Error: java.net.UnknownHostException: /199.168.0.2 at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1200) at java.net.InetAddress.getAllByName0(InetAddress.java:1153) at java.net.InetAddress.getAllByName(InetAddress.java:1083) at java.net.InetAddress.getAllByName(InetAddress.java:1019) at java.net.InetAddress.getByName(InetAddress.java:969) at org.apache.cassandra.client.RingCache.refreshEndpointMap(RingCache.java:93) at org.apache.cassandra.client.RingCache.(RingCache.java:67) at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter.(ColumnFamilyRecordWriter.java:98) at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter.(ColumnFamilyRecordWriter.java:92) at org.apache.cassandra.hadoop.ColumnFamilyOutputFormat.getRecordWriter(ColumnFamilyOutputFormat.java:132) at org.apache.cassandra.hadoop.ColumnFamilyOutputFormat.getRecordWriter(ColumnFamilyOutputFormat.java:62) at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:553) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408) at org.apache.hadoop.mapred.Child.main(Child.java:170)</p> <p>Here are the config line for map/reduce.</p> <pre><code> job4.setReducerClass(TblUploadReducer.class ); job4.setOutputKeyClass(ByteBuffer.class); job4.setOutputValueClass(List.class); job4.setOutputFormatClass(ColumnFamilyOutputFormat.class); ConfigHelper.setOutputColumnFamily(job4.getConfiguration(), args[1],args[3] ); ConfigHelper.setRpcPort(job4.getConfiguration(), args[7]); // 9160 ConfigHelper.setInitialAddress(job4.getConfiguration(), args[9]); // 199.168.0.2 ConfigHelper.setPartitioner(job4.getConfiguration(), "org.apache.cassandra.dht.RandomPartitioner"); </code></pre> <p>Steps which I have verified are</p> <ul> <li>There is a passwordless ssh has been configured b/w lab02,lab03 &lab04. All the nodes can ping each other with out any issues.</li> <li>When I ran "InetAddress.getLocalHost()" from java program on lab02 it prints "lab02/199.168.0.2".</li> <li>When I over looked "o/p" of bin/cassandra it prints couple of messages and under InetAddress field "/199.168.0.3" etc. Here it does not print "hostname/IP". Is that problem?</li> </ul> <p>Kindly help me to resolve above issue.</p> <p>Regards, Thamizhannal </p>

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