Hadoop MapReduce编程 API入门系列之最短路径（十五）

　　不多说，直接上代码。

======================================
= Iteration: 1
= Input path: out/shortestpath/input.txt
= Output path: out/shortestpath/1
======================================
2016-12-12 16:37:05,638 INFO [org.apache.hadoop.metrics.jvm.JvmMetrics] - Initializing JVM Metrics with processName=JobTracker, sessionId=
2016-12-12 16:37:06,231 WARN [org.apache.hadoop.mapreduce.JobSubmitter] - Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
2016-12-12 16:37:06,236 WARN [org.apache.hadoop.mapreduce.JobSubmitter] - No job jar file set. User classes may not be found. See Job or Job#setJar(String).
2016-12-12 16:37:06,260 INFO [org.apache.hadoop.mapreduce.lib.input.FileInputFormat] - Total input paths to process : 1
2016-12-12 16:37:06,363 INFO [org.apache.hadoop.mapreduce.JobSubmitter] - number of splits:1
2016-12-12 16:37:06,831 INFO [org.apache.hadoop.mapreduce.JobSubmitter] - Submitting tokens for job: job_local535100118_0001
2016-12-12 16:37:07,524 INFO [org.apache.hadoop.mapreduce.Job] - The url to track the job: http://localhost:8080/
2016-12-12 16:37:07,526 INFO [org.apache.hadoop.mapreduce.Job] - Running job: job_local535100118_0001
2016-12-12 16:37:07,534 INFO [org.apache.hadoop.mapred.LocalJobRunner] - OutputCommitter set in config null
2016-12-12 16:37:07,550 INFO [org.apache.hadoop.mapred.LocalJobRunner] - OutputCommitter is org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
2016-12-12 16:37:07,635 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Waiting for map tasks
2016-12-12 16:37:07,638 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Starting task: attempt_local535100118_0001_m_000000_0
2016-12-12 16:37:07,716 INFO [org.apache.hadoop.yarn.util.ProcfsBasedProcessTree] - ProcfsBasedProcessTree currently is supported only on Linux.
2016-12-12 16:37:07,759 INFO [org.apache.hadoop.mapred.Task] - Using ResourceCalculatorProcessTree : org.apache.hadoop.yarn.util.WindowsBasedProcessTree@27b70923
2016-12-12 16:37:07,767 INFO [org.apache.hadoop.mapred.MapTask] - Processing split: file:/D:/Code/MyEclipseJavaCode/myMapReduce/out/shortestpath/input.txt:0+149
2016-12-12 16:37:07,830 INFO [org.apache.hadoop.mapred.MapTask] - (EQUATOR) 0 kvi 26214396(104857584)
2016-12-12 16:37:07,830 INFO [org.apache.hadoop.mapred.MapTask] - mapreduce.task.io.sort.mb: 100
2016-12-12 16:37:07,830 INFO [org.apache.hadoop.mapred.MapTask] - soft limit at 83886080
2016-12-12 16:37:07,830 INFO [org.apache.hadoop.mapred.MapTask] - bufstart = 0; bufvoid = 104857600
2016-12-12 16:37:07,830 INFO [org.apache.hadoop.mapred.MapTask] - kvstart = 26214396; length = 6553600
2016-12-12 16:37:07,834 INFO [org.apache.hadoop.mapred.MapTask] - Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
input -> K[dee],V[0 null hadoop hello]
output -> K[dee],V[0 hadoop hello]
output -> K[hadoop],V[1 dee]
output -> K[hello],V[1 dee]
input -> K[hadoop],V[2147483647 null hive hello]
output -> K[hadoop],V[2147483647 hive hello]
input -> K[hello],V[2147483647 null dee hadoop hive joe]
output -> K[hello],V[2147483647 dee hadoop hive joe]
input -> K[hive],V[2147483647 null hadoop hello joe]
output -> K[hive],V[2147483647 hadoop hello joe]
input -> K[joe],V[2147483647 null hive hello]
output -> K[joe],V[2147483647 hive hello]
2016-12-12 16:37:07,851 INFO [org.apache.hadoop.mapred.LocalJobRunner] -
2016-12-12 16:37:07,851 INFO [org.apache.hadoop.mapred.MapTask] - Starting flush of map output
2016-12-12 16:37:07,851 INFO [org.apache.hadoop.mapred.MapTask] - Spilling map output
2016-12-12 16:37:07,851 INFO [org.apache.hadoop.mapred.MapTask] - bufstart = 0; bufend = 174; bufvoid = 104857600
2016-12-12 16:37:07,852 INFO [org.apache.hadoop.mapred.MapTask] - kvstart = 26214396(104857584); kvend = 26214372(104857488); length = 25/6553600
2016-12-12 16:37:07,871 INFO [org.apache.hadoop.mapred.MapTask] - Finished spill 0
2016-12-12 16:37:07,877 INFO [org.apache.hadoop.mapred.Task] - Task:attempt_local535100118_0001_m_000000_0 is done. And is in the process of committing
2016-12-12 16:37:07,891 INFO [org.apache.hadoop.mapred.LocalJobRunner] - file:/D:/Code/MyEclipseJavaCode/myMapReduce/out/shortestpath/input.txt:0+149
2016-12-12 16:37:07,892 INFO [org.apache.hadoop.mapred.Task] - Task 'attempt_local535100118_0001_m_000000_0' done.
2016-12-12 16:37:07,892 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Finishing task: attempt_local535100118_0001_m_000000_0
2016-12-12 16:37:07,892 INFO [org.apache.hadoop.mapred.LocalJobRunner] - map task executor complete.
2016-12-12 16:37:07,896 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Waiting for reduce tasks
2016-12-12 16:37:07,896 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Starting task: attempt_local535100118_0001_r_000000_0
2016-12-12 16:37:07,910 INFO [org.apache.hadoop.yarn.util.ProcfsBasedProcessTree] - ProcfsBasedProcessTree currently is supported only on Linux.
2016-12-12 16:37:07,942 INFO [org.apache.hadoop.mapred.Task] - Using ResourceCalculatorProcessTree : org.apache.hadoop.yarn.util.WindowsBasedProcessTree@5bf7b707
2016-12-12 16:37:07,948 INFO [org.apache.hadoop.mapred.ReduceTask] - Using ShuffleConsumerPlugin: org.apache.hadoop.mapreduce.task.reduce.Shuffle@969f4cd
2016-12-12 16:37:07,972 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - MergerManager: memoryLimit=1327077760, maxSingleShuffleLimit=331769440, mergeThreshold=875871360, ioSortFactor=10, memToMemMergeOutputsThreshold=10
2016-12-12 16:37:07,975 INFO [org.apache.hadoop.mapreduce.task.reduce.EventFetcher] - attempt_local535100118_0001_r_000000_0 Thread started: EventFetcher for fetching Map Completion Events
2016-12-12 16:37:08,017 INFO [org.apache.hadoop.mapreduce.task.reduce.LocalFetcher] - localfetcher#1 about to shuffle output of map attempt_local535100118_0001_m_000000_0 decomp: 190 len: 194 to MEMORY
2016-12-12 16:37:08,023 INFO [org.apache.hadoop.mapreduce.task.reduce.InMemoryMapOutput] - Read 190 bytes from map-output for attempt_local535100118_0001_m_000000_0
2016-12-12 16:37:08,076 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - closeInMemoryFile -> map-output of size: 190, inMemoryMapOutputs.size() -> 1, commitMemory -> 0, usedMemory ->190
2016-12-12 16:37:08,078 INFO [org.apache.hadoop.mapreduce.task.reduce.EventFetcher] - EventFetcher is interrupted.. Returning
2016-12-12 16:37:08,080 INFO [org.apache.hadoop.mapred.LocalJobRunner] - 1 / 1 copied.
2016-12-12 16:37:08,081 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - finalMerge called with 1 in-memory map-outputs and 0 on-disk map-outputs
2016-12-12 16:37:08,110 INFO [org.apache.hadoop.mapred.Merger] - Merging 1 sorted segments
2016-12-12 16:37:08,111 INFO [org.apache.hadoop.mapred.Merger] - Down to the last merge-pass, with 1 segments left of total size: 184 bytes
2016-12-12 16:37:08,113 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - Merged 1 segments, 190 bytes to disk to satisfy reduce memory limit
2016-12-12 16:37:08,114 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - Merging 1 files, 194 bytes from disk
2016-12-12 16:37:08,115 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - Merging 0 segments, 0 bytes from memory into reduce
2016-12-12 16:37:08,116 INFO [org.apache.hadoop.mapred.Merger] - Merging 1 sorted segments
2016-12-12 16:37:08,117 INFO [org.apache.hadoop.mapred.Merger] - Down to the last merge-pass, with 1 segments left of total size: 184 bytes
2016-12-12 16:37:08,118 INFO [org.apache.hadoop.mapred.LocalJobRunner] - 1 / 1 copied.
2016-12-12 16:37:08,141 INFO [org.apache.hadoop.conf.Configuration.deprecation] - mapred.skip.on is deprecated. Instead, use mapreduce.job.skiprecords
input -> K[dee]
input -> V[0 hadoop hello]
output -> K[dee],V[0 null hadoop hello]
input -> K[hadoop]
input -> V[2147483647 hive hello]
input -> V[1 dee]
output -> K[hadoop],V[1 dee hive hello]
input -> K[hello]
input -> V[2147483647 dee hadoop hive joe]
input -> V[1 dee]
output -> K[hello],V[1 dee dee hadoop hive joe]
input -> K[hive]
input -> V[2147483647 hadoop hello joe]
output -> K[hive],V[2147483647 null hadoop hello joe]
input -> K[joe]
input -> V[2147483647 hive hello]
output -> K[joe],V[2147483647 null hive hello]
2016-12-12 16:37:08,154 INFO [org.apache.hadoop.mapred.Task] - Task:attempt_local535100118_0001_r_000000_0 is done. And is in the process of committing
2016-12-12 16:37:08,156 INFO [org.apache.hadoop.mapred.LocalJobRunner] - 1 / 1 copied.
2016-12-12 16:37:08,156 INFO [org.apache.hadoop.mapred.Task] - Task attempt_local535100118_0001_r_000000_0 is allowed to commit now
2016-12-12 16:37:08,162 INFO [org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter] - Saved output of task 'attempt_local535100118_0001_r_000000_0' to file:/D:/Code/MyEclipseJavaCode/myMapReduce/out/shortestpath/1/_temporary/0/task_local535100118_0001_r_000000
2016-12-12 16:37:08,163 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-12-12 16:37:08,164 INFO [org.apache.hadoop.mapred.Task] - Task 'attempt_local535100118_0001_r_000000_0' done.
2016-12-12 16:37:08,164 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Finishing task: attempt_local535100118_0001_r_000000_0
2016-12-12 16:37:08,164 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce task executor complete.
2016-12-12 16:37:08,535 INFO [org.apache.hadoop.mapreduce.Job] - Job job_local535100118_0001 running in uber mode : false
2016-12-12 16:37:08,539 INFO [org.apache.hadoop.mapreduce.Job] - map 100% reduce 100%
2016-12-12 16:37:08,544 INFO [org.apache.hadoop.mapreduce.Job] - Job job_local535100118_0001 completed successfully
2016-12-12 16:37:08,601 INFO [org.apache.hadoop.mapreduce.Job] - Counters: 33
File System Counters
FILE: Number of bytes read=1340
FILE: Number of bytes written=387869
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
Map-Reduce Framework
Map input records=5
Map output records=7
Map output bytes=174
Map output materialized bytes=194
Input split bytes=135
Combine input records=0
Combine output records=0
Reduce input groups=5
Reduce shuffle bytes=194
Reduce input records=7
Reduce output records=5
Spilled Records=14
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=0
CPU time spent (ms)=0
Physical memory (bytes) snapshot=0
Virtual memory (bytes) snapshot=0
Total committed heap usage (bytes)=466616320
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=169
File Output Format Counters
Bytes Written=161
======================================
= Iteration: 2
= Input path: out/shortestpath/1
= Output path: out/shortestpath/2
======================================
2016-12-12 16:37:08,638 INFO [org.apache.hadoop.metrics.jvm.JvmMetrics] - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2016-12-12 16:37:08,649 WARN [org.apache.hadoop.mapreduce.JobSubmitter] - Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
2016-12-12 16:37:08,653 WARN [org.apache.hadoop.mapreduce.JobSubmitter] - No job jar file set. User classes may not be found. See Job or Job#setJar(String).
2016-12-12 16:37:09,079 INFO [org.apache.hadoop.mapreduce.lib.input.FileInputFormat] - Total input paths to process : 1
2016-12-12 16:37:09,098 INFO [org.apache.hadoop.mapreduce.JobSubmitter] - number of splits:1
2016-12-12 16:37:09,183 INFO [org.apache.hadoop.mapreduce.JobSubmitter] - Submitting tokens for job: job_local447108750_0002
2016-12-12 16:37:09,525 INFO [org.apache.hadoop.mapreduce.Job] - The url to track the job: http://localhost:8080/
2016-12-12 16:37:09,525 INFO [org.apache.hadoop.mapreduce.Job] - Running job: job_local447108750_0002
2016-12-12 16:37:09,527 INFO [org.apache.hadoop.mapred.LocalJobRunner] - OutputCommitter set in config null
2016-12-12 16:37:09,529 INFO [org.apache.hadoop.mapred.LocalJobRunner] - OutputCommitter is org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
2016-12-12 16:37:09,540 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Waiting for map tasks
2016-12-12 16:37:09,540 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Starting task: attempt_local447108750_0002_m_000000_0
2016-12-12 16:37:09,544 INFO [org.apache.hadoop.yarn.util.ProcfsBasedProcessTree] - ProcfsBasedProcessTree currently is supported only on Linux.
2016-12-12 16:37:09,591 INFO [org.apache.hadoop.mapred.Task] - Using ResourceCalculatorProcessTree : org.apache.hadoop.yarn.util.WindowsBasedProcessTree@25a02403
2016-12-12 16:37:09,597 INFO [org.apache.hadoop.mapred.MapTask] - Processing split: file:/D:/Code/MyEclipseJavaCode/myMapReduce/out/shortestpath/1/part-r-00000:0+149
2016-12-12 16:37:09,662 INFO [org.apache.hadoop.mapred.MapTask] - (EQUATOR) 0 kvi 26214396(104857584)
2016-12-12 16:37:09,663 INFO [org.apache.hadoop.mapred.MapTask] - mapreduce.task.io.sort.mb: 100
2016-12-12 16:37:09,663 INFO [org.apache.hadoop.mapred.MapTask] - soft limit at 83886080
2016-12-12 16:37:09,663 INFO [org.apache.hadoop.mapred.MapTask] - bufstart = 0; bufvoid = 104857600
2016-12-12 16:37:09,663 INFO [org.apache.hadoop.mapred.MapTask] - kvstart = 26214396; length = 6553600
2016-12-12 16:37:09,666 INFO [org.apache.hadoop.mapred.MapTask] - Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
input -> K[dee],V[0 null hadoop hello]
output -> K[dee],V[0 null hadoop hello]
output -> K[hadoop],V[1 null:dee]
output -> K[hello],V[1 null:dee]
input -> K[hadoop],V[1 dee hive hello]
output -> K[hadoop],V[1 dee hive hello]
output -> K[hive],V[2 dee:hadoop]
output -> K[hello],V[2 dee:hadoop]
input -> K[hello],V[1 dee dee hadoop hive joe]
output -> K[hello],V[1 dee dee hadoop hive joe]
output -> K[dee],V[2 dee:hello]
output -> K[hadoop],V[2 dee:hello]
output -> K[hive],V[2 dee:hello]
output -> K[joe],V[2 dee:hello]
input -> K[hive],V[2147483647 null hadoop hello joe]
output -> K[hive],V[2147483647 null hadoop hello joe]
input -> K[joe],V[2147483647 null hive hello]
output -> K[joe],V[2147483647 null hive hello]
2016-12-12 16:37:09,675 INFO [org.apache.hadoop.mapred.LocalJobRunner] -
2016-12-12 16:37:09,675 INFO [org.apache.hadoop.mapred.MapTask] - Starting flush of map output
2016-12-12 16:37:09,675 INFO [org.apache.hadoop.mapred.MapTask] - Spilling map output
2016-12-12 16:37:09,675 INFO [org.apache.hadoop.mapred.MapTask] - bufstart = 0; bufend = 289; bufvoid = 104857600
2016-12-12 16:37:09,676 INFO [org.apache.hadoop.mapred.MapTask] - kvstart = 26214396(104857584); kvend = 26214348(104857392); length = 49/6553600
2016-12-12 16:37:09,691 INFO [org.apache.hadoop.mapred.MapTask] - Finished spill 0
2016-12-12 16:37:09,699 INFO [org.apache.hadoop.mapred.Task] - Task:attempt_local447108750_0002_m_000000_0 is done. And is in the process of committing
2016-12-12 16:37:09,704 INFO [org.apache.hadoop.mapred.LocalJobRunner] - file:/D:/Code/MyEclipseJavaCode/myMapReduce/out/shortestpath/1/part-r-00000:0+149
2016-12-12 16:37:09,705 INFO [org.apache.hadoop.mapred.Task] - Task 'attempt_local447108750_0002_m_000000_0' done.
2016-12-12 16:37:09,705 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Finishing task: attempt_local447108750_0002_m_000000_0
2016-12-12 16:37:09,705 INFO [org.apache.hadoop.mapred.LocalJobRunner] - map task executor complete.
2016-12-12 16:37:09,707 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Waiting for reduce tasks
2016-12-12 16:37:09,708 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Starting task: attempt_local447108750_0002_r_000000_0
2016-12-12 16:37:09,714 INFO [org.apache.hadoop.yarn.util.ProcfsBasedProcessTree] - ProcfsBasedProcessTree currently is supported only on Linux.
2016-12-12 16:37:09,856 INFO [org.apache.hadoop.mapred.Task] - Using ResourceCalculatorProcessTree : org.apache.hadoop.yarn.util.WindowsBasedProcessTree@3f539d4b
2016-12-12 16:37:09,857 INFO [org.apache.hadoop.mapred.ReduceTask] - Using ShuffleConsumerPlugin: org.apache.hadoop.mapreduce.task.reduce.Shuffle@a7bc768
2016-12-12 16:37:09,862 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - MergerManager: memoryLimit=1327077760, maxSingleShuffleLimit=331769440, mergeThreshold=875871360, ioSortFactor=10, memToMemMergeOutputsThreshold=10
2016-12-12 16:37:09,865 INFO [org.apache.hadoop.mapreduce.task.reduce.EventFetcher] - attempt_local447108750_0002_r_000000_0 Thread started: EventFetcher for fetching Map Completion Events
2016-12-12 16:37:09,871 INFO [org.apache.hadoop.mapreduce.task.reduce.LocalFetcher] - localfetcher#2 about to shuffle output of map attempt_local447108750_0002_m_000000_0 decomp: 317 len: 321 to MEMORY
2016-12-12 16:37:09,874 INFO [org.apache.hadoop.mapreduce.task.reduce.InMemoryMapOutput] - Read 317 bytes from map-output for attempt_local447108750_0002_m_000000_0
2016-12-12 16:37:09,876 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - closeInMemoryFile -> map-output of size: 317, inMemoryMapOutputs.size() -> 1, commitMemory -> 0, usedMemory ->317
2016-12-12 16:37:09,877 INFO [org.apache.hadoop.mapreduce.task.reduce.EventFetcher] - EventFetcher is interrupted.. Returning
2016-12-12 16:37:09,879 INFO [org.apache.hadoop.mapred.LocalJobRunner] - 1 / 1 copied.
2016-12-12 16:37:09,879 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - finalMerge called with 1 in-memory map-outputs and 0 on-disk map-outputs
2016-12-12 16:37:09,892 INFO [org.apache.hadoop.mapred.Merger] - Merging 1 sorted segments
2016-12-12 16:37:09,893 INFO [org.apache.hadoop.mapred.Merger] - Down to the last merge-pass, with 1 segments left of total size: 311 bytes
2016-12-12 16:37:09,896 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - Merged 1 segments, 317 bytes to disk to satisfy reduce memory limit
2016-12-12 16:37:09,898 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - Merging 1 files, 321 bytes from disk
2016-12-12 16:37:09,898 INFO [org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl] - Merging 0 segments, 0 bytes from memory into reduce
2016-12-12 16:37:09,898 INFO [org.apache.hadoop.mapred.Merger] - Merging 1 sorted segments
2016-12-12 16:37:09,901 INFO [org.apache.hadoop.mapred.Merger] - Down to the last merge-pass, with 1 segments left of total size: 311 bytes
2016-12-12 16:37:09,902 INFO [org.apache.hadoop.mapred.LocalJobRunner] - 1 / 1 copied.
input -> K[dee]
input -> V[2 dee:hello]
input -> V[0 null hadoop hello]
output -> K[dee],V[0 null hadoop hello]
input -> K[hadoop]
input -> V[1 null:dee]
input -> V[1 dee hive hello]
input -> V[2 dee:hello]
output -> K[hadoop],V[1 null:dee hive hello]
input -> K[hello]
input -> V[1 dee dee hadoop hive joe]
input -> V[2 dee:hadoop]
input -> V[1 null:dee]
output -> K[hello],V[1 dee dee hadoop hive joe]
input -> K[hive]
input -> V[2 dee:hadoop]
input -> V[2 dee:hello]
input -> V[2147483647 null hadoop hello joe]
output -> K[hive],V[2 dee:hadoop hadoop hello joe]
input -> K[joe]
input -> V[2 dee:hello]
input -> V[2147483647 null hive hello]
output -> K[joe],V[2 dee:hello hive hello]
2016-12-12 16:37:09,929 INFO [org.apache.hadoop.mapred.Task] - Task:attempt_local447108750_0002_r_000000_0 is done. And is in the process of committing
2016-12-12 16:37:09,934 INFO [org.apache.hadoop.mapred.LocalJobRunner] - 1 / 1 copied.
2016-12-12 16:37:09,934 INFO [org.apache.hadoop.mapred.Task] - Task attempt_local447108750_0002_r_000000_0 is allowed to commit now
2016-12-12 16:37:09,944 INFO [org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter] - Saved output of task 'attempt_local447108750_0002_r_000000_0' to file:/D:/Code/MyEclipseJavaCode/myMapReduce/out/shortestpath/2/_temporary/0/task_local447108750_0002_r_000000
2016-12-12 16:37:09,947 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-12-12 16:37:09,948 INFO [org.apache.hadoop.mapred.Task] - Task 'attempt_local447108750_0002_r_000000_0' done.
2016-12-12 16:37:09,948 INFO [org.apache.hadoop.mapred.LocalJobRunner] - Finishing task: attempt_local447108750_0002_r_000000_0
2016-12-12 16:37:09,948 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce task executor complete.
2016-12-12 16:37:10,526 INFO [org.apache.hadoop.mapreduce.Job] - Job job_local447108750_0002 running in uber mode : false
2016-12-12 16:37:10,526 INFO [org.apache.hadoop.mapreduce.Job] - map 100% reduce 100%
2016-12-12 16:37:10,527 INFO [org.apache.hadoop.mapreduce.Job] - Job job_local447108750_0002 completed successfully
2016-12-12 16:37:10,542 INFO [org.apache.hadoop.mapreduce.Job] - Counters: 35
File System Counters
FILE: Number of bytes read=3162
FILE: Number of bytes written=776144
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
Map-Reduce Framework
Map input records=5
Map output records=13
Map output bytes=289
Map output materialized bytes=321
Input split bytes=140
Combine input records=0
Combine output records=0
Reduce input groups=5
Reduce shuffle bytes=321
Reduce input records=13
Reduce output records=5
Spilled Records=26
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=0
CPU time spent (ms)=0
Physical memory (bytes) snapshot=0
Virtual memory (bytes) snapshot=0
Total committed heap usage (bytes)=677380096
PATH
dee:hello=1
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=169
File Output Format Counters
Bytes Written=159
zhouls.bigdata.myMapReduce.shortestpath.Reduce$PathCounter
TARGET_NODE_DISTANCE_COMPUTED=2
==========================================
= Shortest path found, details as follows.
=
= Start node: dee
= End node: joe
= Hops: 2
= Path: dee:hello
==========================================

代码

package zhouls.bigdata.myMapReduce.shortestpath;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

public class Map
extends Mapper<Text, Text, Text, Text> {

private Text outKey = new Text();
private Text outValue = new Text();

@Override
protected void map(Text key, Text value, Context context)
throws IOException, InterruptedException {

Node node = Node.fromMR(value.toString());

System.out.println("input -> K[" + key + "],V[" + node + "]");

// output this node's key/value pair again to preserve the information
//
System.out.println(
" output -> K[" + key + "],V[" + value + "]");
context.write(key, value);

// only output the neighbor details if we have an actual distance
// from the source node
//
if (node.isDistanceSet()) {
// our neighbors are just a hop away
//

// create the backpointer, which will append our own
// node name to the list
//
String backpointer = node.constructBackpointer(key.toString());

// go through all the nodes and propagate the distance to them
//
for (int i = 0; i < node.getAdjacentNodeNames().length; i++) {

String neighbor = node.getAdjacentNodeNames()[i];
int neighborDistance = node.getDistance() + 1;

// output the neighbor with the propagated distance and backpointer
//
outKey.set(neighbor);

Node adjacentNode = new Node()
.setDistance(neighborDistance)
.setBackpointer(backpointer);

outValue.set(adjacentNode.toString());
System.out.println(
" output -> K[" + outKey + "],V[" + outValue + "]");
context.write(outKey, outValue);
}
}
}
}

package zhouls.bigdata.myMapReduce.shortestpath;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.*;

import java.io.IOException;

public class Reduce
extends Reducer<Text, Text, Text, Text> {

public static enum PathCounter {
TARGET_NODE_DISTANCE_COMPUTED,
PATH
}

private Text outValue = new Text();
private String targetNode;

protected void setup(Context context
) throws IOException, InterruptedException {
targetNode = context.getConfiguration().get(
Main.TARGET_NODE);
}

public void reduce(Text key, Iterable<Text> values,
Context context)
throws IOException, InterruptedException {

int minDistance = Node.INFINITE;

System.out.println("input -> K[" + key + "]");

Node shortestAdjacentNode = null;
Node originalNode = null;

for (Text textValue : values) {
System.out.println(" input -> V[" + textValue + "]");

Node node = Node.fromMR(textValue.toString());

if(node.containsAdjacentNodes()) {
// the original data
//
originalNode = node;
}

if(node.getDistance() < minDistance) {
minDistance = node.getDistance();
shortestAdjacentNode = node;
}
}

if(shortestAdjacentNode != null) {
originalNode.setDistance(minDistance);
originalNode.setBackpointer(shortestAdjacentNode.getBackpointer());
}

outValue.set(originalNode.toString());

System.out.println(
" output -> K[" + key + "],V[" + outValue + "]");
context.write(key, outValue);

if (minDistance != Node.INFINITE &&
targetNode.equals(key.toString())) {
Counter counter = context.getCounter(
PathCounter.TARGET_NODE_DISTANCE_COMPUTED);
counter.increment(minDistance);
context.getCounter(PathCounter.PATH.toString(),
shortestAdjacentNode.getBackpointer()).increment(1);
}
}
}

package zhouls.bigdata.myMapReduce.shortestpath;

import org.apache.commons.lang.StringUtils;

import java.io.IOException;
import java.util.Arrays;

public class Node {
private int distance = INFINITE;
private String backpointer;
private String[] adjacentNodeNames;

public static int INFINITE = Integer.MAX_VALUE;
public static final char fieldSeparator = '\t';

public int getDistance() {
return distance;
}

public Node setDistance(int distance) {
this.distance = distance;
return this;
}

public String getBackpointer() {
return backpointer;
}

public Node setBackpointer(String backpointer) {
this.backpointer = backpointer;
return this;
}

public String constructBackpointer(String name) {
StringBuilder backpointers = new StringBuilder();
if (StringUtils.trimToNull(getBackpointer()) != null) {
backpointers.append(getBackpointer()).append(":");
}
backpointers.append(name);
return backpointers.toString();
}

public String[] getAdjacentNodeNames() {
return adjacentNodeNames;
}

public Node setAdjacentNodeNames(String[] adjacentNodeNames) {
this.adjacentNodeNames = adjacentNodeNames;
return this;
}

public boolean containsAdjacentNodes() {
return adjacentNodeNames != null;
}

public boolean isDistanceSet() {
return distance != INFINITE;
}

@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(distance)
.append(fieldSeparator)
.append(backpointer);

if (getAdjacentNodeNames() != null) {
sb.append(fieldSeparator)
.append(StringUtils
.join(getAdjacentNodeNames(), fieldSeparator));
}
return sb.toString();
}

public static Node fromMR(String value) throws IOException {
String[] parts = StringUtils.splitPreserveAllTokens(
value, fieldSeparator);
if (parts.length < 2) {
throw new IOException(
"Expected 2 or more parts but received " + parts.length);
}
Node node = new Node()
.setDistance(Integer.valueOf(parts[0]))
.setBackpointer(StringUtils.trimToNull(parts[1]));
if (parts.length > 2) {
node.setAdjacentNodeNames(Arrays.copyOfRange(parts, 2,
parts.length));
}
return node;
}
}

package zhouls.bigdata.myMapReduce.shortestpath;

import org.apache.commons.io.*;
import org.apache.commons.lang.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.input.*;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import java.io.*;
import java.util.Iterator;

public final class Main {

public static final String TARGET_NODE = "shortestpath.targetnode";

public static void main(String... args) throws Exception {

String startNode = "dee";
String targetNode = "joe";
// String inputFile = "hdfs://HadoopMaster:9000/shortestpath/shortestpath.txt";
// String outputDir = "hdfs://HadoopMaster:9000/out/shortestpath";

String inputFile = "./data/shortestpath/shortestpath.txt";
String outputDir = "./out/shortestpath";

iterate(startNode, targetNode, inputFile, outputDir);
}
public static Configuration conf = new Configuration();
static{

// conf.set("fs.defaultFS", "hdfs://HadoopMaster:9000");
// conf.set("yarn.resourcemanager.hostname", "HadoopMaster");
}

public static void iterate(String startNode, String targetNode,
String input, String output)
throws Exception {

Path outputPath = new Path(output);
outputPath.getFileSystem(conf).delete(outputPath, true);
outputPath.getFileSystem(conf).mkdirs(outputPath);

Path inputPath = new Path(outputPath, "input.txt");

createInputFile(new Path(input), inputPath, startNode);

int iter = 1;

while (true) {

Path jobOutputPath =
new Path(outputPath, String.valueOf(iter));

System.out.println("======================================");
System.out.println("= Iteration: " + iter);
System.out.println("= Input path: " + inputPath);
System.out.println("= Output path: " + jobOutputPath);
System.out.println("======================================");

if(findShortestPath(inputPath, jobOutputPath, startNode, targetNode)) {
break;
}
inputPath = jobOutputPath;
iter++;
}
}

public static void createInputFile(Path file, Path targetFile,
String startNode)
throws IOException {
FileSystem fs = file.getFileSystem(conf);

OutputStream os = fs.create(targetFile);
LineIterator iter = org.apache.commons.io.IOUtils
.lineIterator(fs.open(file), "UTF8");
while (iter.hasNext()) {
String line = iter.nextLine();

String[] parts = StringUtils.split(line);
int distance = Node.INFINITE;
if (startNode.equals(parts[0])) {
distance = 0;
}
IOUtils.write(parts[0] + '\t' + String.valueOf(distance) + "\t\t",
os);
IOUtils.write(StringUtils.join(parts, '\t', 1, parts.length), os);
IOUtils.write("\n", os);
}

os.close();
}

public static boolean findShortestPath(Path inputPath,
Path outputPath, String startNode,
String targetNode)
throws Exception {
conf.set(TARGET_NODE, targetNode);

Job job = new Job(conf);
job.setJarByClass(Main.class);
job.setMapperClass(Map.class);
job.setReducerClass(Reduce.class);

job.setInputFormatClass(KeyValueTextInputFormat.class);

job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);

FileInputFormat.setInputPaths(job, inputPath);
FileOutputFormat.setOutputPath(job, outputPath);

if (!job.waitForCompletion(true)) {
throw new Exception("Job failed");
}

Counter counter = job.getCounters()
.findCounter(Reduce.PathCounter.TARGET_NODE_DISTANCE_COMPUTED);

if(counter != null && counter.getValue() > 0) {
CounterGroup group = job.getCounters().getGroup(Reduce.PathCounter.PATH.toString());
Iterator<Counter> iter = group.iterator();
iter.hasNext();
String path = iter.next().getName();
System.out.println("==========================================");
System.out.println("= Shortest path found, details as follows.");
System.out.println("= ");
System.out.println("= Start node: " + startNode);
System.out.println("= End node: " + targetNode);
System.out.println("= Hops: " + counter.getValue());
System.out.println("= Path: " + path);
System.out.println("==========================================");
return true;
}
return false;
}

// public static String getNeighbor(String str){
// return str.split(",")[0];
// }
// public static int getNeighborDis(String str){
// return Integer.parseInt(str.split(",")[1]);
// }

}