Hola.

Gracias por la respuesta.

He reiniciado los servicios de hdfs y he podido lanzar el proceso. Aunque se han producido algunas excepciones creo que el proceso de mapReduce ha finalizado bien.

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[cloudera@quickstart wordcount]$ hadoop jar wordcount-1.jar com.formacionhadoop.wordcount.WordCountDriver /tmp/oscar/formacionhadoop/desarrollador/cervantes/novela /tmp/oscar/formacionhadoop/desarrollador/ResulWordCountNovela
18/02/27 04:17:07 INFO client.RMProxy: Connecting to ResourceManager at quickstart.cloudera/127.0.0.1:8032
18/02/27 04:17:08 WARN mapreduce.JobResourceUploader: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
18/02/27 04:17:09 INFO input.FileInputFormat: Total input paths to process : 13
18/02/27 04:17:09 WARN hdfs.DFSClient: Caught exception
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at java.lang.Thread.join(Thread.java:1281)
at java.lang.Thread.join(Thread.java:1355)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.closeResponder(DFSOutputStream.java:952)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.endBlock(DFSOutputStream.java:690)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:879)
18/02/27 04:17:09 WARN hdfs.DFSClient: Caught exception
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at java.lang.Thread.join(Thread.java:1281)
at java.lang.Thread.join(Thread.java:1355)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.closeResponder(DFSOutputStream.java:952)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.endBlock(DFSOutputStream.java:690)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:879)
18/02/27 04:17:09 INFO mapreduce.JobSubmitter: number of splits:13
18/02/27 04:17:09 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1519729858709_0005
18/02/27 04:17:10 INFO impl.YarnClientImpl: Submitted application application_1519729858709_0005
18/02/27 04:17:10 INFO mapreduce.Job: The url to track the job: http://quickstart.cloudera:8088/proxy/application_1519729858709_0005/
18/02/27 04:17:10 INFO mapreduce.Job: Running job: job_1519729858709_0005
18/02/27 04:17:26 INFO mapreduce.Job: Job job_1519729858709_0005 running in uber mode : false
18/02/27 04:17:26 INFO mapreduce.Job: map 0% reduce 0%
18/02/27 04:17:55 INFO mapreduce.Job: map 15% reduce 0%
18/02/27 04:18:24 INFO mapreduce.Job: map 31% reduce 0%
18/02/27 04:18:44 INFO mapreduce.Job: map 46% reduce 0%
18/02/27 04:19:03 INFO mapreduce.Job: map 62% reduce 0%
18/02/27 04:19:22 INFO mapreduce.Job: map 77% reduce 0%
18/02/27 04:19:42 INFO mapreduce.Job: map 92% reduce 0%
18/02/27 04:20:00 INFO mapreduce.Job: map 100% reduce 0%
18/02/27 04:20:04 INFO mapreduce.Job: map 100% reduce 100%
18/02/27 04:20:04 INFO mapreduce.Job: Job job_1519729858709_0005 completed successfully
18/02/27 04:20:05 INFO mapreduce.Job: Counters: 49
File System Counters
FILE: Number of bytes read=577523
FILE: Number of bytes written=3328251
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
HDFS: Number of bytes read=3739852
HDFS: Number of bytes written=301399
HDFS: Number of read operations=42
HDFS: Number of large read operations=0
HDFS: Number of write operations=2
Job Counters
Launched map tasks=13
Launched reduce tasks=1
Data-local map tasks=13
Total time spent by all maps in occupied slots (ms)=140245504
Total time spent by all reduces in occupied slots (ms)=9623040
Total time spent by all map tasks (ms)=273917
Total time spent by all reduce tasks (ms)=18795
Total vcore-milliseconds taken by all map tasks=273917
Total vcore-milliseconds taken by all reduce tasks=18795
Total megabyte-milliseconds taken by all map tasks=140245504
Total megabyte-milliseconds taken by all reduce tasks=9623040
Map-Reduce Framework
Map input records=25553
Map output records=719769
Map output bytes=6429481
Map output materialized bytes=949414
Input split bytes=2439
Combine input records=0
Combine output records=0
Reduce input groups=28468
Reduce shuffle bytes=949414
Reduce input records=719769
Reduce output records=28468
Spilled Records=1439538
Shuffled Maps =13
Failed Shuffles=0
Merged Map outputs=13
GC time elapsed (ms)=3104
CPU time spent (ms)=24140
Physical memory (bytes) snapshot=1714270208
Virtual memory (bytes) snapshot=9791086592
Total committed heap usage (bytes)=710148096
Shuffle Errors
BAD_ID=0
CONNECTION=0
IO_ERROR=0
WRONG_LENGTH=0
WRONG_MAP=0
WRONG_REDUCE=0
File Input Format Counters
Bytes Read=3737413
File Output Format Counters
Bytes Written=301399

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Muchas gracias.

Un saludo,

Óscar.