Electronic mail system with methodology providing...

Details Electronic mail system with methodology providing... Electronic mail system with methodology providing...

2006-10-03

2006-10-03

Jaroenchonwanit, Bunjob (Department: 2143)

Electrical computers and digital processing systems: multicomput

Computer conferencing

Demand based messaging

C707S793000

Reexamination Certificate

active

07117246

ABSTRACT:
An electronic mail system with a methodology providing distributed message storage and processing is described. In particular, this methodology breaks up how the individual components of message data are stored. Message data itself is broken up into two parts: a metadata (mutable) portion, and an immutable portion. The metadata portion represents that part of the message data that may change over time. This includes message status flags (e.g., the IMAP “message deleted” flag) and the message's position within a particular message folder, among other information. The immutable portion, which comprises the bulk of electronic mail data (namely, the message itself), once stored is never edited. Immutable data is written f+1 times on as many unique servers, to tolerate f number of server failures using Lampson's stable storage algorithm. The metadata portion is stored 2f+1 times on as many unique servers to tolerate f number of server failures using quorum voting. Once the message has been stored once, instead of being copied, its location is passed around by reference. The system utilizes a two-tier architecture. One tier consists of servers which store message metadata and immutable data, the Data Servers, and servers that operating upon those data, the Access Servers. Message store integrity is maintained in the event of server failure and as the set of Data Servers changes. In the latter case, I/O and storage workloads are dynamically redistributed across Data Servers in an efficient way.

REFERENCES:
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Crispin, M., RFC2061: IMAP4 Compatibility With IMAP2BIS, Internet Engineering Task Force, Doc. 1996.
Crispin, M., RFC2060: Internet Message Access Protocol—Version 4 (rev 1), Internet Engineering Task Force, Nov. 1996.
Myers, J., RFC2033: Local Mail Transfer Protocol, Internet Engineering Task Force, Oct. 1996.
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Partridge, Craig, RFC974: Mail Routing and the Domain System, Internet Engineering Task Force, Jan. 1986.
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Postel, Jonathan B., RFC821: Simple Mail Transfer Protocol, Information Sciences Institute, University of Southern California, Aug. 1982.

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