Hadoop执行MapReduce作业的过程-案例-计算pi的值

编程语言 2019-01-07 11:07:03 阅读次数: 0
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           在安装好了Hadoop集群后，我们是不是马上想去实践一下，做个例子来测试它是否符合我们的要求呢。这样，我们使用系统的例子来测试，也就最常见的求PI 的值。

          首先要启动好集群。hdfs 和yarn相关进程都启动，并且正常，才能执行mapreduce作业，因为执行作业需要调用资源，就必须启动yarn 服务。

      

    以上是正常的。 我们就可以执行mr 作业了。

2. 在hadoop 目录下有 share目录，下面有写好的例子，打包为jar 文件，我们可以直接拿来测试。

 命令:  hadoop  jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar 10 100        

执行结果如下: 日志输出:  

Number of Maps  = 10
Samples per Map = 100
19/01/07 09:45:48 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Wrote input for Map #0

Starting Job
19/01/07 09:45:52 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/01/07 09:45:52 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
19/01/07 09:45:53 INFO input.FileInputFormat: Total input paths to process : 10
19/01/07 09:45:53 INFO mapreduce.JobSubmitter: number of splits:10
19/01/07 09:45:54 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_local127055197_0001
19/01/07 09:45:55 INFO mapreduce.Job: The url to track the job: http://localhost:8080/
19/01/07 09:45:55 INFO mapreduce.Job: Running job: job_local127055197_0001
19/01/07 09:45:55 INFO mapred.LocalJobRunner: OutputCommitter set in config null
19/01/07 09:45:55 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:45:55 INFO mapred.LocalJobRunner: OutputCommitter is org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
19/01/07 09:45:55 INFO mapred.LocalJobRunner: Waiting for map tasks
19/01/07 09:45:55 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000000_0
19/01/07 09:45:55 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:45:55 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:45:55 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part0:0+118
19/01/07 09:45:56 INFO mapreduce.Job: Job job_local127055197_0001 running in uber mode : false
19/01/07 09:45:57 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:45:57 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:45:57 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:45:57 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:45:57 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:45:57 INFO mapreduce.Job:  map 0% reduce 0%
19/01/07 09:45:57 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:45:58 INFO mapred.LocalJobRunner: 
19/01/07 09:45:58 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:45:58 INFO mapred.MapTask: Spilling map output
19/01/07 09:45:58 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:45:58 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:45:58 INFO mapred.MapTask: Finished spill 0
19/01/07 09:45:58 INFO mapred.Task: Task:attempt_local127055197_0001_m_000000_0 is done. And is in the process of committing
19/01/07 09:45:59 INFO mapred.LocalJobRunner: map
19/01/07 09:45:59 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000000_0' done.
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000000_0
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000001_0
19/01/07 09:45:59 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:45:59 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:45:59 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part1:0+118
19/01/07 09:45:59 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:45:59 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:45:59 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:45:59 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:45:59 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:45:59 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:45:59 INFO mapred.LocalJobRunner: 
19/01/07 09:45:59 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:45:59 INFO mapred.MapTask: Spilling map output
19/01/07 09:45:59 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:45:59 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:45:59 INFO mapred.MapTask: Finished spill 0
19/01/07 09:45:59 INFO mapred.Task: Task:attempt_local127055197_0001_m_000001_0 is done. And is in the process of committing
19/01/07 09:45:59 INFO mapred.LocalJobRunner: map
19/01/07 09:45:59 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000001_0' done.
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000001_0
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000002_0
19/01/07 09:45:59 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:45:59 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:45:59 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part2:0+118
19/01/07 09:45:59 INFO mapreduce.Job:  map 100% reduce 0%
19/01/07 09:45:59 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:45:59 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:45:59 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:45:59 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:45:59 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:45:59 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:45:59 INFO mapred.LocalJobRunner: 
19/01/07 09:45:59 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:45:59 INFO mapred.MapTask: Spilling map output
19/01/07 09:45:59 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:45:59 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:45:59 INFO mapred.MapTask: Finished spill 0
19/01/07 09:45:59 INFO mapred.Task: Task:attempt_local127055197_0001_m_000002_0 is done. And is in the process of committing
19/01/07 09:45:59 INFO mapred.LocalJobRunner: map
19/01/07 09:45:59 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000002_0' done.
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000002_0
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000003_0
19/01/07 09:45:59 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:45:59 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:45:59 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part3:0+118
19/01/07 09:45:59 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:45:59 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:45:59 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:45:59 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:45:59 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:45:59 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:45:59 INFO mapred.LocalJobRunner: 
19/01/07 09:45:59 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:45:59 INFO mapred.MapTask: Spilling map output
19/01/07 09:45:59 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:45:59 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:45:59 INFO mapred.MapTask: Finished spill 0
19/01/07 09:45:59 INFO mapred.Task: Task:attempt_local127055197_0001_m_000003_0 is done. And is in the process of committing
19/01/07 09:45:59 INFO mapred.LocalJobRunner: map
19/01/07 09:45:59 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000003_0' done.
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000003_0
19/01/07 09:45:59 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000004_0
19/01/07 09:45:59 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:45:59 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:45:59 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part4:0+118
19/01/07 09:46:00 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:46:00 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:46:00 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:46:00 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:46:00 INFO mapred.LocalJobRunner: 
19/01/07 09:46:00 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:46:00 INFO mapred.MapTask: Spilling map output
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:46:00 INFO mapred.MapTask: Finished spill 0
19/01/07 09:46:00 INFO mapred.Task: Task:attempt_local127055197_0001_m_000004_0 is done. And is in the process of committing
19/01/07 09:46:00 INFO mapred.LocalJobRunner: map
19/01/07 09:46:00 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000004_0' done.
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000004_0
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000005_0
19/01/07 09:46:00 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:46:00 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:46:00 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part5:0+118
19/01/07 09:46:00 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:46:00 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:46:00 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:46:00 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:46:00 INFO mapred.LocalJobRunner: 
19/01/07 09:46:00 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:46:00 INFO mapred.MapTask: Spilling map output
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:46:00 INFO mapred.MapTask: Finished spill 0
19/01/07 09:46:00 INFO mapred.Task: Task:attempt_local127055197_0001_m_000005_0 is done. And is in the process of committing
19/01/07 09:46:00 INFO mapred.LocalJobRunner: map
19/01/07 09:46:00 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000005_0' done.
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000005_0
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000006_0
19/01/07 09:46:00 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:46:00 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:46:00 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part6:0+118
19/01/07 09:46:00 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:46:00 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:46:00 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:46:00 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:46:00 INFO mapred.LocalJobRunner: 
19/01/07 09:46:00 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:46:00 INFO mapred.MapTask: Spilling map output
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:46:00 INFO mapred.MapTask: Finished spill 0
19/01/07 09:46:00 INFO mapred.Task: Task:attempt_local127055197_0001_m_000006_0 is done. And is in the process of committing
19/01/07 09:46:00 INFO mapred.LocalJobRunner: map
19/01/07 09:46:00 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000006_0' done.
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000006_0
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000007_0
19/01/07 09:46:00 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:46:00 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:46:00 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part7:0+118
19/01/07 09:46:00 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:46:00 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:46:00 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:46:00 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:46:00 INFO mapred.LocalJobRunner: 
19/01/07 09:46:00 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:46:00 INFO mapred.MapTask: Spilling map output
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:46:00 INFO mapred.MapTask: Finished spill 0
19/01/07 09:46:00 INFO mapred.Task: Task:attempt_local127055197_0001_m_000007_0 is done. And is in the process of committing
19/01/07 09:46:00 INFO mapred.LocalJobRunner: map
19/01/07 09:46:00 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000007_0' done.
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000007_0
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000008_0
19/01/07 09:46:00 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:46:00 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:46:00 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part8:0+118
19/01/07 09:46:00 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:46:00 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:46:00 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:46:00 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:46:00 INFO mapred.LocalJobRunner: 
19/01/07 09:46:00 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:46:00 INFO mapred.MapTask: Spilling map output
19/01/07 09:46:00 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:46:00 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:46:00 INFO mapred.MapTask: Finished spill 0
19/01/07 09:46:00 INFO mapred.Task: Task:attempt_local127055197_0001_m_000008_0 is done. And is in the process of committing
19/01/07 09:46:00 INFO mapred.LocalJobRunner: map
19/01/07 09:46:00 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000008_0' done.
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000008_0
19/01/07 09:46:00 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_m_000009_0
19/01/07 09:46:00 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:46:00 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:46:00 INFO mapred.MapTask: Processing split: hdfs://slave4:8020/user/root/QuasiMonteCarlo_1546825548256_803866814/in/part9:0+118
19/01/07 09:46:01 INFO mapred.MapTask: (EQUATOR) 0 kvi 26214396(104857584)
19/01/07 09:46:01 INFO mapred.MapTask: mapreduce.task.io.sort.mb: 100
19/01/07 09:46:01 INFO mapred.MapTask: soft limit at 83886080
19/01/07 09:46:01 INFO mapred.MapTask: bufstart = 0; bufvoid = 104857600
19/01/07 09:46:01 INFO mapred.MapTask: kvstart = 26214396; length = 6553600
19/01/07 09:46:01 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/01/07 09:46:01 INFO mapred.LocalJobRunner: 
19/01/07 09:46:01 INFO mapred.MapTask: Starting flush of map output
19/01/07 09:46:01 INFO mapred.MapTask: Spilling map output
19/01/07 09:46:01 INFO mapred.MapTask: bufstart = 0; bufend = 18; bufvoid = 104857600
19/01/07 09:46:01 INFO mapred.MapTask: kvstart = 26214396(104857584); kvend = 26214392(104857568); length = 5/6553600
19/01/07 09:46:01 INFO mapred.MapTask: Finished spill 0
19/01/07 09:46:01 INFO mapred.Task: Task:attempt_local127055197_0001_m_000009_0 is done. And is in the process of committing
19/01/07 09:46:01 INFO mapred.LocalJobRunner: map
19/01/07 09:46:01 INFO mapred.Task: Task 'attempt_local127055197_0001_m_000009_0' done.
19/01/07 09:46:01 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_m_000009_0
19/01/07 09:46:01 INFO mapred.LocalJobRunner: map task executor complete.
19/01/07 09:46:01 INFO mapred.LocalJobRunner: Waiting for reduce tasks
19/01/07 09:46:01 INFO mapred.LocalJobRunner: Starting task: attempt_local127055197_0001_r_000000_0
19/01/07 09:46:01 INFO output.FileOutputCommitter: File Output Committer Algorithm version is 1
19/01/07 09:46:01 INFO mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
19/01/07 09:46:01 INFO mapred.ReduceTask: Using ShuffleConsumerPlugin: org.apache.hadoop.mapreduce.task.reduce.Shuffle@47665d9c
19/01/07 09:46:01 INFO reduce.MergeManagerImpl: MergerManager: memoryLimit=363285696, maxSingleShuffleLimit=90821424, mergeThreshold=239768576, ioSortFactor=10, memToMemMergeOutputsThreshold=10
19/01/07 09:46:01 INFO reduce.EventFetcher: attempt_local127055197_0001_r_000000_0 Thread started: EventFetcher for fetching Map Completion Events
19/01/07 09:46:01 INFO reduce.LocalFetcher: localfetcher#1 about to shuffle output of map attempt_local127055197_0001_m_000002_0 decomp: 24 len: 28 to MEMORY
19/01/07 09:46:01 INFO reduce.InMemoryMapOutput: Read 24 bytes from map-output for attempt_local127055197_0001_m_000002_0
19/01/07 09:46:01 INFO reduce.MergeManagerImpl: closeInMemoryFile -> map-output of size: 24, inMemoryMapOutputs.size() -> 1, commitMemory -> 0, usedMemory ->24
19/01/07 09:46:01 INFO reduce.LocalFetcher: localfetcher#1 about to shuffle output of map attempt_local127055197_0001_m_000005_0 decomp: 24 len: 28 to MEMORY
19/01/07 09:46:01 INFO reduce.InMemoryMapOutput: Read 24 bytes from map-output for attempt_local127055197_0001_m_000005_0
19/01/07 09:46:01 INFO reduce.MergeManagerImpl: closeInMemoryFile -> map-output of size: 24, inMemoryMapOutputs.size() -> 2.  commitMemory -> 24, usedMemory ->48

。。。。。。

中间不相关的日志输出 省略掉了，日志内容很长。

19/01/07 09:46:02 INFO mapred.LocalJobRunner: reduce > reduce
19/01/07 09:46:02 INFO mapred.Task: Task 'attempt_local127055197_0001_r_000000_0' done.
19/01/07 09:46:02 INFO mapred.LocalJobRunner: Finishing task: attempt_local127055197_0001_r_000000_0
19/01/07 09:46:02 INFO mapred.LocalJobRunner: reduce task executor complete.
19/01/07 09:46:02 INFO mapreduce.Job:  map 100% reduce 100%
19/01/07 09:46:03 INFO mapreduce.Job: Job job_local127055197_0001 completed successfully
19/01/07 09:46:03 INFO mapreduce.Job: Counters: 35
    File System Counters
        FILE: Number of bytes read=3334288
        FILE: Number of bytes written=6451908
        FILE: Number of read operations=0
        FILE: Number of large read operations=0
        FILE: Number of write operations=0
        HDFS: Number of bytes read=7670
        HDFS: Number of bytes written=13195
        HDFS: Number of read operations=242
        HDFS: Number of large read operations=0
        HDFS: Number of write operations=135
    Map-Reduce Framework
        Map input records=10
        Map output records=20
        Map output bytes=180
        Map output materialized bytes=280
        Input split bytes=1420
        Combine input records=0
        Combine output records=0
        Reduce input groups=2
        Reduce shuffle bytes=280
        Reduce input records=20
        Reduce output records=0
        Spilled Records=40
        Shuffled Maps =10
        Failed Shuffles=0
        Merged Map outputs=10
        GC time elapsed (ms)=594
        Total committed heap usage (bytes)=1714962432
    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=1180
    File Output Format Counters 
        Bytes Written=97
Job Finished in 10.837 seconds
Estimated value of Pi is 3.14800000000000000000

蓝色的即 是计算后的最终结果。 

这就是最简单的mapreduce 作业。 我们也可以在yarn 的8088 端口查看作业的运行情况。

有结果输出的，但是web查看却有问题，可能是yarn-site.xml 配置文件有些问题。

在排查一下。结果可以在控制台查看到。web查看的是作业的执行情况，不会显示执行结果的。

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