Forums server restting TCP connections and performance numbers

I have a packetsniffer running on my network because I was testing some
issues with the webservice interface when I noticed something strange.
The server accepted a request and started processing it, then after 72
seconds it suddenly closed the connection. My client obviously retried,
and the server immediately closed the connection again. I have attached
the TCP dump summary as "Server connection resets.txt" to this message.
Later on I captured the TCP dump of a server timeout. Or maybe not
really a timeout, but after 630 seconds waiting for a list of all forums
I decided it was enough. The TCP dump summary is attached as "Server
connection timeout.txt". If necessary I have the full dump, but I would
have to sanitize it.
This kill after 630 seconds is the worst case I have seen so far. On
average a call to the webservice API to download the list of all
communities takes approximately 110 seconds until the first response
bytes arrive. A full login cycle (request to forum, request to login
service, request to forum, request to API) consistently takes 17 seconds.
Jochem
Jochem van Dieten
http://jochem.vandieten.net/

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(I'm not asking for anyone to design my software for me, I'm just looking for a response along the lines of "That's called XYZ server design, look for books on this topic" sort of thing.)
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[**CLICK HERE FOR A DIAGRAM**|http://imgur.com/sb5ZU]
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Any insight is appreciated, the shorter and more candid, the better. Don't be afraid to say I'm in over my head and should read a few books by author so-and-so, that's a good starting point :)

jta23 wrote:
(I'm not asking for anyone to design my software for me, I'm just looking for a response along the lines of "That's called XYZ server design, look for books on this topic" sort of thing.)
Summary:
I have a Server application (S) that accepts connections from many Clients (C). The clients request pieces of a large internal data structure, *"Data"* (D). The clients are totally passive with respect to Data, they only read (from the Server) and do not initiate any modification.
Are you using Servlets? That should facilitate the development of your server immensely (e.g., maintains sessions, handles multi-threading, implements HTTP out of the box, dozens of additional frameworks available, etc.)
D is really a structure of structures: it's hashtables of hashtables, with objects that hold other hashtables and vectors, etc. etc., down a few levels. The clients don't read the entire structure, just parts of it.
You can get away with using Map of Map or Map of List or whatever level of nesting you want. Generally, however, it is better to implement a canonical and rich domain model. [http://www.eaipatterns.com/CanonicalDataModel.html]. [http://www.substanceofcode.com/2007/01/17/from-anemic-to-rich-domain-model/].
The Server is multi-threaded, with threads handling client communications, and a very important thread that modifies Data by processing messages from an external source. I call this part of the software the Message Processor (P). These messages are what drives manipulation of the data structure.
[**CLICK HERE FOR A DIAGRAM**|http://imgur.com/sb5ZU]
There are a couple of design questions I'm wondering about:
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My question is, is this the only design pattern I can use in this situation? It looks like the only way to improve performance is to
a) make sure I only lock when necessary (to prevent data corruption or inconsistency)This can easily be handled by a Servlet. I think the best way to do this would be to create a Singleton. [www.javacoffeebreak.com/articles/designpatterns/index.html]. Be careful, however. Singletons are like global variables. They can easily be abused. If you did not want a singleton, create a lock table in your database. The RDBMS will handle synchronization for you, and it is an elegant solution. You can perform a similar feat using a filesystem lock that you create. Up to you. Whether in the JVM, in the database or in the filesystem.
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Take a look at JBoss serialization. It is much more compact that Java's. Or do some experimenting. JSON is much more compact than XML normally, and it can be read by a Javascript client to facilitate any Ajax you might want to use for some flash and sizzle.
Any insight is appreciated, the shorter and more candid, the better. Don't be afraid to say I'm in over my head and should read a few books by author so-and-so, that's a good starting point :)No, take it in bite sized pieces. Start with the server. Then work on the client. Play around with your locking strategy. Optimize your update of the data. Don't do everything at once.
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Attachments:
TCP Open close issue.vi ‏15 KB

smercurio_fc wrote:
If I understand you correctly you want the time delay to be 1 second if there's a successful connection....
While I don't have a specific answer for this problem. I want to clarify for him. I believe the issue is, what if all connections ARE there? That means you keep returning a wait of 1 second 50-100 times so It takes 50-100 seconds just to initialize. I think the user is looking for a way to check for valid connections, but do so in such a way that eliminates the need for a wait which is greatly slowing things down.
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Forums server restting TCP connections and performance numbers

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