FAQ
Hi,

I want to know I/O Performance of my Hadoop Cluster. Because of that I ran
test.jar, hier is my Results;

----- TestDFSIO ----- : write
Date & time: Mon May 02 14:38:29 CEST 2011
Number of files: 10
Total MBytes processed: 10000
Throughput mb/sec: 12.809033955468113
Average IO rate mb/sec: 13.16771411895752
IO rate std deviation: 2.059995952372142
Test exec time sec: 964.4

----- TestDFSIO ----- : read
Date & time: Mon May 02 15:00:10 CEST 2011
Number of files: 10
Total MBytes processed: 10000
Throughput mb/sec: 12.938200684430816
Average IO rate mb/sec: 14.908231735229492
IO rate std deviation: 4.231364683566859
Test exec time sec: 941.601

read-speed and write-speed almost same!!! Why can't I read faster?

thanks,

Baran

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  • Konstantin Boudnik at May 3, 2011 at 6:53 pm
    [taking common-@ and hdfs-@ lists to Bcc:]
    Please do not cross-post.On Tue, May 3, 2011 at 03:26, baran cakici
    wrote:
    Hi,

    I want to know I/O Performance of my Hadoop Cluster. Because of that I ran
    test.jar, hier is my Results;

    ----- TestDFSIO ----- : write
    Date & time: Mon May 02 14:38:29 CEST 2011
    Number of files: 10
    Total MBytes processed: 10000
    Throughput mb/sec: 12.809033955468113
    Average IO rate mb/sec: 13.16771411895752
    IO rate std deviation: 2.059995952372142
    Test exec time sec: 964.4

    ----- TestDFSIO ----- : read
    Date & time: Mon May 02 15:00:10 CEST 2011
    Number of files: 10
    Total MBytes processed: 10000
    Throughput mb/sec: 12.938200684430816
    Average IO rate mb/sec: 14.908231735229492
    IO rate std deviation: 4.231364683566859
    Test exec time sec: 941.601

    read-speed and write-speed almost same!!! Why can't I read faster?

    thanks,

    Baran

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groupcommon-user @
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postedMay 3, '11 at 10:26a
activeMay 3, '11 at 6:53p
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