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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-601) Hama Streaming
Date Thu, 09 Aug 2012 13:20:19 GMT

    [ https://issues.apache.org/jira/browse/HAMA-601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13431791#comment-13431791

Thomas Jungblut commented on HAMA-601:

You can have a look at the classes involved here:


The main part "BinaryProtocol", at least the communication with the forked process.
Note that this is still work in progress and may change until it finally reaches a patch in
the other issue (It's done when its done). 
> 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
> %SEND_MESSAGE%=this is the message
> or sync:
> $SYNC$=
> 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
> This time I do not advise to copy the whole streaming from Hadoop itself. However the
parts that repacks the jar with needed execution scripts and the option handling seems good
to reuse.
> The input- and outputstream handling must be written from scratch because we want to
take actions into account.

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