You can, yes. I encourage you to ask detailed questions in the HBase area. You could also evaluate Apache Phoenix as another SQL-over-HBase option (not currently supported by Cloudera though). ... View more

Gautam, You are right. The treeset is treated like any collection object within MR   The following Mapper code worked for me   import java.io.IOException; import java.util.Iterator; import java.util.TreeSet; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.NullWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Mapper; public class KPWordCountMapper extends Mapper<LongWritable, Text, Text, NullWritable>{ int count = 0; @Override public void map(LongWritable inputKey,Text inputVal,Context context) throws IOException,InterruptedException { TreeSet<String> ts = new TreeSet<>(); String line = inputVal.toString(); String[] splits = line.split("\\W+"); for(String outputKey:splits) if(outputKey.length() > 0){ ts.add(outputKey); } Iterator<String> itr= ts.iterator(); while(itr.hasNext()){ context.write(new Text(itr.next()),NullWritable.get()); } } } ... View more

Hi Team,   I got a solution.   When we are selecting an instance with instance store for configuring CDH, the log files will be automatically stored to the instance store. While we stops the instance the data / logs in the instance store will be deleted and that results to showing error " Missing Blocks".    For avoiding this we need to remove instance store while launching instance or we need to change the log location to EBS volume manually after completing installation. I think its better to remove the instance store while launching the instance. Thanks to all you..    Cheers!!!! ... View more

I solved the problem.   cloudera-scm user did not have access to a parent folder: /pkg/moip/mo10755/work/mzpl which caused that the cloudera-scm user could not run any scripts from parcel subfolders.   I changed the permissions and now it works 🙂   Thank you very much for your help! ... View more