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From "Thomas Jungblut (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-546) Add access to remote memory
Date Sun, 01 Apr 2012 15:06:27 GMT
Add access to remote memory
---------------------------

                 Key: HAMA-546
                 URL: https://issues.apache.org/jira/browse/HAMA-546
             Project: Hama
          Issue Type: New Feature
          Components: bsp
            Reporter: Thomas Jungblut


bsp_get and bsp_put are integral parts of the BSP computing model.
They are defined as follows:

bsp_get [1]
{quote}
     The bsp_get(3) and bsp_hpget(3) operations  reach  into  the
     local   memory   of  another  process  and  copy  previously
     registered remote data held there into a data  structure  in
     the local memory of the process that initiated them.
{quote}
bsp_put [2]
{quote}
     The aim of bsp_put(3) and  bsp_hpput(3)  is  to  provide  an
     operation  akin  memcpy(3C) available in the Unix <string.h>
     library.  Both operations copy a specified number of  bytes,
     from  a byte addressed data structure in the local memory of
     one process into contiguous memory locations  in  the  local
     memory of another process. The distinguishing factor between
     these operations is provided by the buffering choice.
{quote}

A very simple implementation can be based on a HashMap on every peer which can be obtained
via RPC. 
In this case we need to extend the MessageManager to be able to do off-the-band communication.
It would be great to extract a common interface which can be inter-operable with other caching
tools like DirectMemory or EHCache. 


[1] http://www.bsp-worldwide.org/implmnts/oxtool/man/bsp_get.3.html
[2] http://www.bsp-worldwide.org/implmnts/oxtool/man/bsp_put.3.html

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