Hi All, This is regarding multi-node cluster configuration doubt.
I have configured 3 nodes of cluster using Cassandra-0.8.4 and getting error when I ran Map/Reduce job which uploads records from HDFS to Cassandra. Here are my 3 nodes cluster config file (cassandra.yaml) for Cassandra: node01: seeds: "node01,node02,node03" auto_bootstrap: false listen_address: 192.168.0.1 rpc_address: 192.168.0.1 node02: seeds: "node01,node02,node03" auto_bootstrap: true listen_address: 192.168.0.2 rpc_address: 192.168.0.2 node03: seeds: "node01,node02,node03" auto_bootstrap: true listen_address: 192.168.0.3 rpc_address: 192.168.0.3 When I ran M/R program, I am getting below error 11/08/23 04:37:00 INFO mapred.JobClient: map 100% reduce 11% 11/08/23 04:37:06 INFO mapred.JobClient: map 100% reduce 22% 11/08/23 04:37:09 INFO mapred.JobClient: map 100% reduce 33% 11/08/23 04:37:14 INFO mapred.JobClient: Task Id : attempt_201104211044_0719_r_000000_0, Status : FAILED java.lang.NullPointerException at org.apache.cassandra.client.RingCache.getRange(RingCache.java:130) at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter.write(ColumnFamilyRecordWriter.java:125) at org.apache.cassandra.hadoop.ColumnFamilyRecordWriter.write(ColumnFamilyRecordWriter.java:60) at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80) at CassTblUploader$TblUploadReducer.reduce(CassTblUploader.java:90) at CassTblUploader$TblUploadReducer.reduce(CassTblUploader.java:1) at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:174) at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:563) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408) at org.apache.hadoop.mapred.Child.main(Child.java:170) Is anything wrong on my cassandra.yaml file? I followed http://wiki.apache.org/cassandra/MultinodeCluster for cluster configuration. Regards, Thamizhannal
