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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAILBOX-44) [gsoc2011] Design and implement a distributed mailbox using Hadoop
Date Tue, 14 Jun 2011 21:40:48 GMT

    [ https://issues.apache.org/jira/browse/MAILBOX-44?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049445#comment-13049445

stack commented on MAILBOX-44:

@Loan Going the Gora route will allow you swap stores.   I've not used it so am not up on
the costs that come with the indirection (if any). 

You'll need to figure a schema design for your store.  I'd suggest you study how James does
queries currently and make a list.  This will be the key input feeding your schema design.
 For example, in the coming "HBase: The Definitive Guide", Lars has some discussion of HBase
as a mail store.  Rows are sorted in HBase so he arrives at a row key schema that looks like

<userid><date in reversed chronological order so you see newest mail first><message-id><attachment-id>

You can start up a scan to see all mail from a user and you'll see the latest first. Mail
will be grouped by mail id.  If attachments ids are their sequence number, then they'll be
encountered in order (you'll probably need to zero pad some of the attributes above).  This
is just an example.  You may end up w/ different row key design after you've studied James

> [gsoc2011] Design and implement a distributed mailbox using Hadoop
> ------------------------------------------------------------------
>                 Key: MAILBOX-44
>                 URL: https://issues.apache.org/jira/browse/MAILBOX-44
>             Project: James Mailbox
>          Issue Type: New Feature
>            Reporter: Eric Charles
>            Assignee: Norman Maurer
>              Labels: gsoc2011
>             Fix For: 0.3
> Context: The mailbox subproject (http://james.apache.org/mailbox/) supports maildir,
SQL database (via JPA) and Java Content Repository (JCR) as technology for mail storage. This
flexibility is achieved thanks to a API design that abstracts mail storage from the mail protocols.
> Task: We need to implement mailbox storage as a distributed system on top of Hadoop HDFS.
The James mailbox API will be used. A first step is to design how to interact with Hadoop
(native api, gora incubator at apache,...) and deal with specific performance questions related
to mail loading/parsing in a distributed system (use map/reduce or not, use existing local
lucene indexes for search,...). The second step is to implement the HDFS mailbox (maildir
mailbox is similar because is stores mails as a file and can be an inspiration). A single
James server will still be deployed because we don't have any distributed UID generation.
> Mentor: eric at apache dot org
> Complexity: medium 

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