问题
I have installed Cloudera 5.8 in a Linux RHEL 7.2 instance of Amazon EC2. I have logged in with SSH and I am trying to run the wordcount example for testing mapreduce operation with the following command:
hadoop jar /opt/cloudera/parcels/CDH-5.8.0-1.cdh5.8.0.p0.42/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar wordcount archivo.txt output
The problem is that the wordcount program is blocked and it not produces the output. Only the following is prompted:
16/08/11 13:10:02 INFO client.RMProxy: Connecting to ResourceManager at ip-172-31-22-226.ec2.internal/172.31.22.226:8032
16/08/11 13:10:03 INFO input.FileInputFormat: Total input paths to process : 1
16/08/11 13:10:03 INFO mapreduce.JobSubmitter: number of splits:1
16/08/11 13:10:04 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1470929244097_0007
16/08/11 13:10:04 INFO impl.YarnClientImpl: Submitted application application_1470929244097_0007
16/08/11 13:10:04 INFO mapreduce.Job: The url to track the job: http://ip-172-31-22-226.ec2.internal:8088/proxy/application_1470929244097_0007/
16/08/11 13:10:04 INFO mapreduce.Job: Running job: job_1470929244097_0007
And then get blocked since "Running job". After this I have to press Ctrl+C for unblock and it not produces the output.
Anyone that knows why?. I think it is probably a configuration issue and I am new to DataNodes and so on.
Thanks a lot.
回答1:
Looks like there are no resources (map or reducer slots), job is waiting for resources. You can check the job status on.
http://ip-172-31-22-226.ec2.internal:8088
来源：https://stackoverflow.com/questions/38902620/wordcount-not-running-in-cloudera