$ yarn application -list
Total number of applications (application-types: [] and states: [SUBMITTED, ACCEPTED, RUNNING]):0
Application-Id Application-Name Application-Type User Queue State Final-State Progress Tracking-URL
application_1617778210000_0001 Terasort MAPREDUCE fgedu default FAILED FAILED 100% http://fgedu01:8088/cluster/app/application_1617778210000_0001

$ yarn logs -applicationId application_1617778210000_0001 | grep -i error
2026-04-08 10:00:00,000 ERROR org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster
java.lang.OutOfMemoryError: Java heap space
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1574)

$ vi /bigdata/app/hadoop/etc/hadoop/mapred-site.xml mapreduce.map.memory.mb
4096 mapreduce.map.java.opts
-Xmx3072m mapreduce.reduce.memory.mb
8192 mapreduce.reduce.java.opts
-Xmx6144m yarn.app.mapreduce.am.resource.mb
4096 yarn.app.mapreduce.am.command-opts
-Xmx3072m

$ hadoop jar /bigdata/app/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-3.3.5.jar terasort /user/fgedu/terasort/input /user/fgedu/terasort/output
10:05:00 INFO mapreduce.Job: Job job_1617778210000_0002 completed successfully
10:05:00 INFO mapreduce.Job: Counters: 54
File System Counters
FILE: Number of bytes read=2000000000
FILE: Number of bytes written=3000000000
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
HDFS: Number of bytes read=1000000000
HDFS: Number of bytes written=1000000000
HDFS: Number of read operations=20
HDFS: Number of large read operations=0
HDFS: Number of write operations=10
Job Counters
Launched map tasks=10
Launched reduce tasks=5
Data-local map tasks=10
Rack-local map tasks=0
Total time spent by all maps in occupied slots (ms)=234567
Total time spent by all reduces in occupied slots (ms)=123456
Total time spent by all map tasks (ms)=234567
Total time spent by all reduce tasks (ms)=123456
Total vcore-milliseconds taken by all map tasks=234567
Total vcore-milliseconds taken by all reduce tasks=123456
Total megabyte-milliseconds taken by all map tasks=240104448
Total megabyte-milliseconds taken by all reduce tasks=126418944
Map-Reduce Framework
Map input records=10000000
Map output records=10000000
Map output bytes=1000000000
Map output materialized bytes=1000000000
Input split bytes=1342177280
Combine input records=0
Combine output records=0
Reduce input groups=10000000
Reduce shuffle bytes=1000000000
Reduce input records=10000000
Reduce output records=10000000
Spilled Records=20000000
Failed Shuffles=0
Merged Map outputs=50
GC time elapsed (ms)=2345
CPU time spent (ms)=23456
Physical memory (bytes) snapshot=2345678901
Virtual memory (bytes) snapshot=3456789012
Total committed heap usage (bytes)=2345678901
Shuffle Errors
BAD_ID=0
CONNECTION=0
IO_ERROR=0
WRONG_LENGTH=0
WRONG_MAP=0
WRONG_REDUCE=0
org.apache.hadoop.examples.terasort.TeraSort
InputRecords=10000000
OutputRecords=10000000