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https://issues.apache.org/jira/browse/MAILBOX-44?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049492#comment-13049492
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stack commented on MAILBOX-44:
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All mail in a single row in hbase would mean that the mailbox would be changed
'atomically' since row updates in hbase are so but downsides might be that that
some users would have really big mailboxes and gigabyte-sized rows; this might
mess w/ balance and distribution of across the cluster (perhaps).
If you did put them all in a single row, in hbase columns are sorted too; if
the column qualifier were a reverse order date you could encounter mail in
order of newest first. HBase has versioning too so you could stamp mail into
hbase and write the mail receipt date as the cell version. Naturally it
returns versions in order of newest first.
How would you do threading? Does James support this? What else does James
support that you expect the db to provide?
> [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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