查看调测结果

操作场景

MapReduce应用程序运行完成后，可通过如下方式查看应用程序的运行情况。

• 在IntelliJ IDEA中查看应用程序运行情况。
• 通过MapReduce日志获取应用程序运行情况。
• 登录MapReduce WebUI查看应用程序运行情况。
• 登录Yarn WebUI查看应用程序运行情况。

请联系管理员获取具有访问WebUI权限的业务账号及其密码。

操作步骤

• 查看运行结果获取应用运行情况

  如下所示，通过控制台输出结果查看应用运行情况。

  3614 [main] INFO  org.apache.hadoop.hdfs.PeerCache  - SocketCache disabled.
  10159 [main] INFO  org.apache.hadoop.mapreduce.lib.input.FileInputFormat  - Total input files to process : 2
  11378 [main] INFO  org.apache.hadoop.mapreduce.JobSubmitter  - number of splits:2
  12707 [main] INFO  org.apache.hadoop.mapreduce.JobSubmitter  - Submitting tokens for job: job_1468241424339_0002
  16434 [main] INFO  org.apache.hadoop.yarn.client.api.impl.YarnClientImpl  - Submitted application application_1468241424339_0002
  16656 [main] INFO  org.apache.hadoop.mapreduce.Job  - The url to track the job: http://10-120-180-170:8088/proxy/application_1468241424339_0002/
  16657 [main] INFO  org.apache.hadoop.mapreduce.Job  - Running job: job_1468241424339_0002
  31177 [main] INFO  org.apache.hadoop.mapreduce.Job  - Job job_1468241424339_0002 running in uber mode : false
  31200 [main] INFO  org.apache.hadoop.mapreduce.Job  -  map 0% reduce 0%
  45893 [main] INFO  org.apache.hadoop.mapreduce.Job  -  map 100% reduce 0%
  57172 [main] INFO  org.apache.hadoop.mapreduce.Job  -  map 100% reduce 100%
  58554 [main] INFO  org.apache.hadoop.mapreduce.Job  - Job job_1468241424339_0002 completed successfully
  58908 [main] INFO  org.apache.hadoop.mapreduce.Job  - Counters: 49
  File System Counters
  FILE: Number of bytes read=75
  FILE: Number of bytes written=436979
  FILE: Number of read operations=0
  FILE: Number of large read operations=0
  FILE: Number of write operations=0
  HDFS: Number of bytes read=674
  HDFS: Number of bytes written=23
  HDFS: Number of read operations=9
  HDFS: Number of large read operations=0
  HDFS: Number of write operations=2
  Job Counters 
  Launched map tasks=2
  Launched reduce tasks=1
  Data-local map tasks=2
  Total time spent by all maps in occupied slots (ms)=206088
  Total time spent by all reduces in occupied slots (ms)=73824
  Total time spent by all map tasks (ms)=25761
  Total time spent by all reduce tasks (ms)=9228
  Total vcore-seconds taken by all map tasks=25761
  Total vcore-seconds taken by all reduce tasks=9228
  Total megabyte-seconds taken by all map tasks=105517056
  Total megabyte-seconds taken by all reduce tasks=37797888
  Map-Reduce Framework
  Map input records=26
  Map output records=16
  Map output bytes=186
  Map output materialized bytes=114
  Input split bytes=230
  Combine input records=16
  Combine output records=6
  Reduce input groups=3
  Reduce shuffle bytes=114
  Reduce input records=6
  Reduce output records=2
  Spilled Records=12
  Shuffled Maps =2
  Failed Shuffles=0
  Merged Map outputs=2
  GC time elapsed (ms)=356
  CPU time spent (ms)=2860
  Physical memory (bytes) snapshot=1601576960
  Virtual memory (bytes) snapshot=12999819264
  Total committed heap usage (bytes)=2403336192
  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=444
  File Output Format Counters 
  Bytes Written=23

  

  在Windows环境运行样例代码时会出现下面的异常，但是不影响业务：

  java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

• 通过MapReduce服务的WebUI进行查看

  使用具有任务查看权限的用户登录FusionInsight Manager，单击“集群 > 待操作集群的名称 > 服务 > Mapreduce ＞ JobHistoryServer”进入Web界面后查看任务执行状态。

  图1 JobHistory Web UI界面
  
• 通过YARN服务的WebUI进行查看
  使用具有任务查看权限的用户登录FusionInsight Manager，单击“集群 > 待操作集群的名称 > 服务 > Yarn > ResourceManager(主)”进入Web界面后查看任务执行状态。

  图2 ResourceManager Web UI页面
  
• 查看MapReduce日志获取应用运行情况

  您可以查看MapReduce日志了解应用运行情况，并根据日志信息调整应用程序。