Hadoop基准测试（转载）

《hadoop the definitive way》(third version)中的Benchmarking a Hadoop Cluster Test Cases的class在新的版本中已不再试hadoop-*-test.jar, 新版本中做BanchMark Test应采用如下方法：

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1. TestDFSIO

write

TestDFSIO用来测试HDFS的I/O 性能，用一个MapReduce job来并行读取/写入文件， 每个文件在一个独立的map task里被读取或写入，而map的输出用来收集该文件被执行过程中的统计数据，

test1 写入２个文件，每个10MB

%yarn jar share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.2.0-tests.jar TestDFSIO -write -nrFiles 

 -fileSize 

提交job时的consol输出：

13/11/13 01:59:06 INFO fs.TestDFSIO: TestDFSIO.1.7
13/11/13 01:59:06 INFO fs.TestDFSIO: nrFiles = 2
13/11/13 01:59:06 INFO fs.TestDFSIO: nrBytes (MB) = 10.0
13/11/13 01:59:06 INFO fs.TestDFSIO: bufferSize = 1000000
13/11/13 01:59:06 INFO fs.TestDFSIO: baseDir = /benchmarks/TestDFSIO
13/11/13 01:59:15 INFO fs.TestDFSIO: creating control file: 10485760 bytes, 2 files
13/11/13 01:59:26 INFO fs.TestDFSIO: created control files for: 2 files
13/11/13 01:59:27 INFO client.RMProxy: Connecting to ResourceManager at cluster1/172.16.102.201:8032
13/11/13 01:59:27 INFO client.RMProxy: Connecting to ResourceManager at cluster1/172.16.102.201:8032
13/11/13 01:59:56 INFO mapred.FileInputFormat: Total input paths to process : 2
13/11/13 02:00:21 INFO mapreduce.JobSubmitter: number of splits:2
13/11/13 02:00:28 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1384321503481_0003
13/11/13 02:00:34 INFO impl.YarnClientImpl: Submitted application application_1384321503481_0003 to ResourceManager at cluster1/172.16.102.201:8032
13/11/13 02:00:36 INFO mapreduce.Job: The url to track the job: http://cluster1:8888/proxy/application_1384321503481_0003/
13/11/13 02:00:36 INFO mapreduce.Job: Running job: job_1384321503481_0003

从consol输出可以看到:

(1)最终文件默认会被写入id_data文件夹下的/benchmarks/TestDFSIO文件夹下， 通过test.build.data的系统变量可以修改默认设置。

(2)2个map task (number of splits:2), 同时也证明每一个文件的写入或读取都被单独作为一个map task

job跑完后的console输出：

13/11/13 02:08:15 INFO mapreduce.Job:  map 100% reduce 100%
13/11/13 02:08:17 INFO mapreduce.Job: Job job_1384321503481_0003 completed successfully
13/11/13 02:08:21 INFO mapreduce.Job: Counters: 43
    File System Counters
        FILE: Number of bytes read=174
        FILE: Number of bytes written=240262
        FILE: Number of read operations=0
        FILE: Number of large read operations=0
        FILE: Number of write operations=0
        HDFS: Number of bytes read=468
        HDFS: Number of bytes written=20971595
        HDFS: Number of read operations=11
        HDFS: Number of large read operations=0
        HDFS: Number of write operations=4
    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)=63095
        Total time spent by all reduces in occupied slots (ms)=14813
    Map-Reduce Framework
        Map input records=2
        Map output records=10
        Map output bytes=148
        Map output materialized bytes=180
        Input split bytes=244
        Combine input records=0
        Combine output records=0
        Reduce input groups=5
        Reduce shuffle bytes=180
        Reduce input records=10
        Reduce output records=5
        Spilled Records=20
        Shuffled Maps =2
        Failed Shuffles=0
        Merged Map outputs=2
        GC time elapsed (ms)=495
        CPU time spent (ms)=3640
        Physical memory (bytes) snapshot=562757632
        Virtual memory (bytes) snapshot=2523807744
        Total committed heap usage (bytes)=421330944
    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=224
    File Output Format Counters
        Bytes Written=75
13/11/13 02:08:23 INFO fs.TestDFSIO: ----- TestDFSIO ----- : write
13/11/13 02:08:23 INFO fs.TestDFSIO:            Date & time: Wed Nov 13 02:08:22 PST 2013
13/11/13 02:08:23 INFO fs.TestDFSIO:        Number of files: 2
13/11/13 02:08:23 INFO fs.TestDFSIO: Total MBytes processed: 20.0
13/11/13 02:08:23 INFO fs.TestDFSIO:      Throughput mb/sec: 0.5591277606933184
13/11/13 02:08:23 INFO fs.TestDFSIO: Average IO rate mb/sec: 0.5635650753974915
13/11/13 02:08:23 INFO fs.TestDFSIO:  IO rate std deviation: 0.05000733272172887
13/11/13 02:08:23 INFO fs.TestDFSIO:     Test exec time sec: 534.566
13/11/13 02:08:23 INFO fs.TestDFSIO:

从图中可以看到map task 2, reduce task 1, 统计结果中有平均I/O速率，整体速率， job运行时间，写入文件数;

read

%yarn jar share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.2.0-tests.jar TestDFSIO -read  -nrFiles 2 -fileSize 

就不仔细分析了，自己试试。

2. MapReduce Test with Sort

hadoop提供了一个MapReduce 程序，可以测试整个MapReduce System。此基准测试分三步：

# 产生random data

# sort data

# validate results

步骤如下：

1. 产生random data

yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar randomwriter random-data

用RandomWriter产生random data, 在yarn上运行RandomWriter会启动一个MapReduce job, 每个node上默认启动10个map task, 每个map 会产生1GB的random data.

修改默认参数： test.randomwriter.maps_per_host, test.randomwrite.bytes_per_map

2. sort data

yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar sort random-data sorted-data

3.validate results

yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar testmapredsort –sortInput randomdata –sortOutput sorted-data

the command 会启动一个SortValidator 程序，此程序会做一些列检查例如检查unsorted和sorted data是否精确。

3. 其他Tests

MRBench –invoked by mrbench, 此程序会启动一个程序，运行多次

NNBench – invoked by nnbench, namenode上的负载测试

Gridmix  --没兴趣