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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-601) Hama Streaming
Date Wed, 04 Jul 2012 07:12:34 GMT
Thomas Jungblut created HAMA-601:

             Summary: Hama Streaming
                 Key: HAMA-601
                 URL: https://issues.apache.org/jira/browse/HAMA-601
             Project: Hama
          Issue Type: New Feature
          Components: bsp core, messaging
    Affects Versions: 0.6.0
            Reporter: Thomas Jungblut
             Fix For: 0.6.0

We can also do a Streaming job to allow other languages to use Hama's BSP API.

Basically you fork a new process in the BSP method, then set a inputstream for the process
which it can read very simple.
Then an outputstream from the childprocess can be read to give it following abilities:

- get a received message
- send a new message
- sync
- read a line from input
- write to output
- reset the input to reread

Those actions must have a constant prefix, for example send a message could look like this:

%SEND_MESSAGE%=this is the message

or sync:


The logic behind it is that we can simply split in Java code by "=" and the lefthand side
is the action and the righthandside is the value of this action.

Between the peers the messages are Text, which has some overhead but is easier to implement
and the communication between the BSP task and the forked process is based on text/strings

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