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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: Some question about hama-0.6.3
Date Wed, 26 Feb 2014 07:46:06 GMT
> I tried PageRank with a small input of my own.

Hi Wang,

This error often occurs when there is a record conversion error. So,
you should check whether the vertex reader works correctly.

And, I highly recommend you to use latest TRUNK version[1] as possible.

1. http://wiki.apache.org/hama/GettingStarted#Build_latest_version_from_source

Thank you.

On Wed, Feb 26, 2014 at 1:44 PM, developer wang <developer.pw@gmail.com> wrote:
> Hi, all.
>    I am Peng Wang, a student trying to use and learn Hama.
>
>    I cloned the develop git repository of Hama.
>
>    I firstly tried the newest version in the tag, the tag: 0.7.0-SNAPSHOT.
> commit bef419747695d15de8a1087f44028ee40571b5f9
> Author: Edward J. Yoon <edwardyoon@apache.org>
> Date:   Fri Mar 29 00:44:59 2013 +0000
>
>     [maven-release-plugin]  copy for tag 0.7.0-SNAPSHOT
>
>     git-svn-id:
> https://svn.apache.org/repos/asf/hama/tags/0.7.0-SNAPSHOT@1462366
> 13f79535-47bb-0310-9956-ffa450edef68
>
>   But the tag: 0.6.3-RC3
> commit c9526b1272c83d641332667ce5d81d7ccc94be06
> Author: Edward J. Yoon <edwardyoon@apache.org>
> Date:   Sun Oct 6 08:27:00 2013 +0000
>
>     [maven-release-plugin]  copy for tag 0.6.3-RC3
>
>     git-svn-id: https://svn.apache.org/repos/asf/hama/tags/0.6.3-RC3@1529594
> 13f79535-47bb-0310-9956-ffa450edef68
>
>
>    From the commit log, 0.7.0-SNAPSHOT is earlier than 0.6.3-RC3,
>    So I used 0.6.3-RC3 instead of 0.7.0-SNAPSHOT (but on the website of
> hama, 0.7.0-SNAPSHOT is the newest version)
>
>    Then I deployed Hama with the Pseudo Distributed Mode on my desktop with
> 3 task runners.
>    I tried PageRank with a small input of my own.
>    But it failes. And its log is:
> java.lang.IllegalArgumentException: Messages must never be behind the vertex
> in ID! Current Message ID: 100128 vs. 1004
>         at
> org.apache.hama.graph.GraphJobRunner.iterate(GraphJobRunner.java:306)
>         at
> org.apache.hama.graph.GraphJobRunner.doSuperstep(GraphJobRunner.java:254)
>         at org.apache.hama.graph.GraphJobRunner.bsp(GraphJobRunner.java:145)
>         at org.apache.hama.bsp.BSPTask.runBSP(BSPTask.java:177)
>         at org.apache.hama.bsp.BSPTask.run(BSPTask.java:146)
>         at
> org.apache.hama.bsp.GroomServer$BSPPeerChild.main(GroomServer.java:1246)
>
>    Could you tell me what is the problem in my situation?
>
>    I check whether hama had finished the loading phase, and I found
> "14/02/25 16:45:00 INFO graph.GraphJobRunner: 2918 vertices are loaded into
> localhost:60340 "in the log.
>    So it had finished the loading phase.
>
>    After this, I read the source code, and I found during the loading,
> peers would not exchange vertices with each other as hama 0.5.0 did.
>    So how does hama 0.6.3 solve the problem below: a peer load a vertex
> which is belong to another peer?
>
>    Could you tell which branch or tag is a stable version?
>    And does it support fault tolerance for graph algorithms?  and how can I
> get it?
>
>
>



-- 
Edward J. Yoon (@eddieyoon)
Chief Executive Officer
DataSayer, Inc.

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