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From "Jakob Homan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-128) RPC port from BasicRPCCommunications should be only a starting port, and retried
Date Sat, 28 Jan 2012 03:21:13 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195382#comment-13195382
] 

Jakob Homan commented on GIRAPH-128:
------------------------------------

Great, thanks.  +1.
                
> RPC port from BasicRPCCommunications should be only a starting port, and retried
> --------------------------------------------------------------------------------
>
>                 Key: GIRAPH-128
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-128
>             Project: Giraph
>          Issue Type: Improvement
>    Affects Versions: 0.1.0
>            Reporter: Avery Ching
>            Assignee: Avery Ching
>         Attachments: GIRAPH-128.2.patch, GIRAPH-128.3.patch, GIRAPH-128.4.patch
>
>
> Currently Giraph uses a basic port + the task partition to get the RPC port.  This doesn't
work well for when there are multiple Giraph jobs running simultaneously in the same Hadoop
cluster (port conflict).  At the same time, it is nice to use this simple algorithm because
it makes it very easy to debug problems (you can find the troublesome mapper from the RPC
port name).  I will be proposing a simple scheme to retry with another port.  I will round
the total number of mappers up to the nearest power of 10 (let's that that number Z).  Then
I will increment the port number by Z, retrying up to 20 tries.  If you have enough ports,
this scheme would guarantee that up to 20 mappers / node would be supported.  It should be
sufficient for most clusters.  At the same time, we still maintain the easy debugging method
since you it's still easy to figure out the mapper partition from the port (port % Z = map
partition). 

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