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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1052) HDFS scalability with multiple namenodes
Date Wed, 27 Apr 2011 17:00:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025897#comment-13025897
] 

Suresh Srinivas commented on HDFS-1052:
---------------------------------------

Some benchmark results:
h3. TestDFSIO read tests
*Without federation:*
{noformat}
----- TestDFSIO ----- : read
           Date & time: Wed Apr 27 02:04:24 PDT 2011
       Number of files: 1000
Total MBytes processed: 30000.0
     Throughput mb/sec: 43.62329251162561
Average IO rate mb/sec: 44.619869232177734
 IO rate std deviation: 5.060306158158443
    Test exec time sec: 959.943
{noformat}

*With federation:*
{noformat}
----- TestDFSIO ----- : read
           Date & time: Wed Apr 27 02:43:10 PDT 2011
       Number of files: 1000
Total MBytes processed: 30000.0
     Throughput mb/sec: 45.657513857055456
Average IO rate mb/sec: 46.72107696533203
 IO rate std deviation: 5.455125923399539
    Test exec time sec: 924.922
{noformat}

h3. TestDFSIO write tests
*Without federation:*
{noformat}
----- TestDFSIO ----- : write
           Date & time: Wed Apr 27 01:47:50 PDT 2011
       Number of files: 1000
Total MBytes processed: 30000.0
     Throughput mb/sec: 35.940755259031015
Average IO rate mb/sec: 38.236236572265625
 IO rate std deviation: 5.929484960036511
    Test exec time sec: 1266.624
{noformat}

*With federation:*
{noformat}
----- TestDFSIO ----- : write
           Date & time: Wed Apr 27 02:27:12 PDT 2011
       Number of files: 1000
Total MBytes processed: 30000.0
     Throughput mb/sec: 42.17884674597227
Average IO rate mb/sec: 43.11423873901367
 IO rate std deviation: 5.357057259968647
    Test exec time sec: 1135.298
{noformat}


> HDFS scalability with multiple namenodes
> ----------------------------------------
>
>                 Key: HDFS-1052
>                 URL: https://issues.apache.org/jira/browse/HDFS-1052
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: Block pool proposal.pdf, HDFS-1052.3.patch, HDFS-1052.4.patch, HDFS-1052.5.patch,
HDFS-1052.patch, Mulitple Namespaces5.pdf, high-level-design.pdf
>
>
> HDFS currently uses a single namenode that limits scalability of the cluster. This jira
proposes an architecture to scale the nameservice horizontally using multiple namenodes.

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