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Posted to common-user@hadoop.apache.org by 王智谨 <ki...@xiaoi.com> on 2013/11/11 07:52:10 UTC

why Average IO rate is so low in TestDFSIO_results.log?

Hi,

     Could someone tell me something about write in  TestDFSIO_results.log?


     Why is write rate is at a such low speed when comparing with read rate?


  
     Thanks with best regards




----- TestDFSIO ----- : write
           Date & time: Sat Nov 09 21:56:22 CST 2013
       Number of files: 10
Total MBytes processed: 10000
     Throughput mb/sec: 21.39060310805463
Average IO rate mb/sec: 21.533655166625977
 IO rate std deviation: 1.843575759457151
    Test exec time sec: 71.216


----- TestDFSIO ----- : read
           Date & time: Sat Nov 09 22:04:23 CST 2013
       Number of files: 10
Total MBytes processed: 10000
     Throughput mb/sec: 119.13555243155662
Average IO rate mb/sec: 219.4121551513672
 IO rate std deviation: 168.6579654117539
    Test exec time sec: 36.063