Server Push Intermittent message loss
We are using LCDS 2.6 and using the RTMP port for the server push. However, at times the notifications in between the server to clients goes missing. It works pretty good at times and after some time, it does not shows notification.
We are using DataTransactionServices for pushing the data from LCDS to the Flex clients.
Hello,
We are still facing the intermittent issue with LCDS. Following steps has been done:
1. We tried different values in DataDestination property like autoSyncEnbaled , cache items and some other properties, but it did not work.
2. We analysed LCDS logs in log file and found that :
a. Java Code is pushing updated state to LCDS and message is also routing to client.
b. At client side UI is receiving old data from LCDS.
Do you have any idea, why is this happening?
Gaurav Shukla
Senior Technical Architect -ADCOE
HCL Technologies Ltd.
SEZ, Plot No. 3A, Sector 126, Noida 201301, U.P. (India)
Mob: +91-9899 89 9189
www.hcltech.com<http://www.hcltech.com>
www.hcl.com<http://www.hcl.com>
cid:[email protected]
Similar Messages
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I read somewhere that Flex Data Services provides Server-Push
functionality. That is, the server starts a conversation with the
client. It's obvious that, In order to such thing ocurr, there has
to be a persistent connection between server and client.
I've being reading about Data Management Service to learn how
to implement this Server-Push and all I see is about a method
called Fill() that is thriggered from the client and syncronizes
it's data with the server. But it's not server-push
Does it really exist?Hi,
When you create a DataService and fill your collection. The
collection becomes managed. You don't have to call fill again if
there is any change in the data. Server pushs updates to clients
when the client's dataservice is using rtmp channel. It is a live
connection between the server and the client. For example,
you fill(collection, "hqsql", from products where price <
100). If one of the product's price increases, server push a
message to your collection to remove it. If a product's product's
price decrease, it will be added to the collection. The push is
happened based on your fill method.
William Chan -
Getting 500 - Internal Server Error Intermittently durin WS calls
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1) Account - Query
2) Opportunity - Query & Update
3) Revenue - Query & Update
4) Product - Query
5) Login/Logout
We are seeing 500 - Internal Server Error intermittently but very frequently while calling these web services. Here are the details:
2008-06-03 11:47:46,781|58:58|WARN |(null)|(null)|R90IntegrationQPoller.CustomerEventProcessor|Query SOD For Account Failed with ExceptionProtocolError. Message: The remote server returned an error: (500) Internal Server Error.. Response: System.Net.HttpWebResponse. Stack Trace: at System.Net.HttpWebRequest.GetResponse()
at R90IntegrationQPoller.CustomerEventProcessor.QuerySODService(DimensionMemberStruc[] dimensions) in c:\r90buildsod\r90_proj\R90IntegrationQPoller\CustomerEventProcessor.cs:line 635
2008-06-03 11:47:46,781|58:58|WARN |(null)|(null)|R90IntegrationQPoller.CustomerEventProcessor|Query SOD For Account Exception Status =ProtocolError
2008-06-03 11:47:46,781|58:58|WARN |(null)|(null)|R90IntegrationQPoller.CustomerEventProcessor|Query SOD For Account Exception Source = System
2008-06-03 11:47:46,781|58:58|WARN |(null)|(null)|R90IntegrationQPoller.CustomerEventProcessor|Query SOD For Account Exception Inner Exception =
2008-06-03 11:47:46,781|58:58|WARN |(null)|(null)|R90IntegrationQPoller.CustomerEventProcessor|Query SOD For Account Exception Target Site = System.Net.WebResponse GetResponse()
I've provided the error message for Account WS but we are seeing this for almost all the web services on regular basis. This issue has made the integration almost unusable. I'm working with Techsupport but they have been very unresponsive in the SR.
Please advice.2008-06-03 12:13:15,156|64:64|WARN |(null)|(null)|R90IntegrationQPoller.RevenueEventProcessor|Query Revenue From SOD Failed with ExceptionProtocolError. Message: The remote server returned an error: (500) Internal Server Error.. Response: System.Net.HttpWebResponse. Stack Trace: at System.Net.HttpWebRequest.GetResponse()
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2008-06-03 12:13:15,156|64:64|WARN |(null)|(null)|R90IntegrationQPoller.RevenueEventProcessor|Query Revenue From SOD Exception Status =ProtocolError
2008-06-03 12:13:15,156|64:64|WARN |(null)|(null)|R90IntegrationQPoller.RevenueEventProcessor|Query Revenue From SOD Exception Source = System
2008-06-03 12:13:15,156|64:64|WARN |(null)|(null)|R90IntegrationQPoller.RevenueEventProcessor|Query Revenue From SOD Exception Inner Exception =
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Using the new Data/Services generation with server push
Have moved my Flex/BlazeDS app (which uses Blaze AMFChannel for request/response messages and StreamingAMFChannel for server push messaging) from Flex Builder 3 to Flash Builder 4. The new Data/Services works fine to generate service classes and value objects for the request/response messages, question is can it provide any help setting up a messaging consumer and value objects for the pushed data?
rick hollandI am so sorry - I meant AirPort Express - not extreme - but it's moot since I missed the point of your post - you want two outputs - and one to not be digital.
For what it's worth - I still think the express might be your best bet.
http://www.apple.com/airportexpress/airtunes.html
It has combined digital/analog out - you plug in one and it switches the output depending on which connection is inserted. I would expect a very short wait until everything accepts digital input - expecially for people who want good sound quality. If you have to go digital to analog outside of the receiver/amp (where it really belongs) - why not let it be the express sitting right next to where you want the second "receiver" to be... -
Revision: 4290
Author: [email protected]
Date: 2008-12-11 14:24:37 -0800 (Thu, 11 Dec 2008)
Log Message:
Bug: BLZ-288 - Consumer is only receiving first pushed message when Consumer and RemoteObject that is used to push the messages use different channel sets but same channel.
QA: Yes
Doc: No
Checkintests Pass: Yes
Details:
* The bug app was arguably generating bogus test data (messages with duplicate ids), and 99.9% of applications won't be configured this way (using multiple ChannelSets with overlapping Channels, pointing at the same server) but it's still worth making this work just right anyways.
Ticket Links:
http://bugs.adobe.com/jira/browse/BLZ-288
Modified Paths:
flex/sdk/trunk/frameworks/projects/rpc/src/mx/messaging/ConsumerMessageDispatcher.asRemember that Arch Arm is a different distribution, but we try to bend the rules and provide limited support for them. This may or may not be unique to Arch Arm, so you might try asking on their forums as well.
-
FDS for server push + client to client
Just want to double check - if I was to create a chat like
app in Flex - where new messages are "pushed" to clients, this
would require FDS.Using FDS would be the far easiest way to implement a chat
application.
Theoretically you could implement a chat application without
FDS by having each client poll the server for messages for new
messages for that client using HTTPService or WebService.
You can also do "poor man's data push" using a long-lasting
HTTP request - in this pattern each client posts an HTTP request
that it doesn't expect and immediate response to - when the server
has a message for the client is sends the response (perhaps a long
time later). In the client's event handler for the response the
client posts another request (so that the server has a means of
"pushing" data to the client). This is how Blackberry-style email
works in Windows Mobile (in the absence of a proper data push
protocol).
Sean
Neville's Introduction to the Flex Message Service has a good
example of how to write a chat application in FDS.
Graeme Harker's Flex.NET
Blog -
Implementing Server Push using LCDS 2.6
Hi All,
We have created an application where we are using polling to get certain constant updates. Now this polling is client polling wherein the client polls the server at regular intervals to get the fresh data for certain actions.
Now we wish to take this to another level and implement Server Data Push so that the client does not keep polling unnecessarily and the server notifies the client as and when the data gets updated with the server. For this we have the DataService Transaction class that needs to be implemented.
But there are a couple of questions that are in my mind regarding this technology. It would be great if someone could answer them.
My questions are:
1) Does the LCDS server know which client to push data to in case of multiple clients looking at the same data scenario. e.g. Two clients A and B are looking at the same data. A performs an action and that action needs some time to get completed at the server. Now in case we use Server Data Push, will the LCDS be intelligent enough to send the message on completion of the requested activity to only A and not B.
2) In order to push data to the client, the server will invoke some method which will return the desired data to te client. How do we keep the parameters registered with the server that this method would need while getting invoked. SInce, the call to the method will not be client initiated, how does the server know what parameters to be passed to the method in order to invoke it. How will this work in a multi-user looking at the same data/screen scenario.
The answers to these questions will really help us. In case anyone is well versed with this technology, please pitch in to give your inputs.
Many Thanks.
Regards,
ShallyHi,
As also, suggested by you, we were thinking of using an RTMP channel only for this since its a two way socket that establishes a communication channel between the client and the server and then helps keep messages moving to and fro.
We have successfully implemented RTMP channel and achieved the following functionalities.
1) A client initiated change which gets propagated to the server and then to all the clients.
2) Server push to all the clients.
Now our last step is to implement data push to a particular client. As told by you, we will use the client id but we have some doubts and questions regarding this since we do not have the code examples or anything that could help us in implementing the same.
I would therefore request you to kindly lead us on the following fronts:
1) Is the client id the one that is part of the request- response thread, I saw a client id being printed in the logs when a request is made and the response comes.
2) What code needs to be written on the server side to extract this client id once a call is made so that it can keep this client id with itself to push a message later on.
3) What methods or API are available to be used to push this message to a particular client? Do we need to call the fill method of a particular client using the client id parameter and inform the client that its requested job has been done.
For (3) is the Messaging(Publish and Subscribe model) the right way to go??
It would be great if you could provide us some code snippets just to give us an idea from where we can take it up ourselves.
Looking forward to hear from you.
Many Thanks,
Shally
Message was edited by: testing34 -
Hi AnyOne!
I have a servlet, and a database . If a column in my table gets updated I
want all of my clients who are connected to it , to see the refreshed value
without click any refresh/Reload button on the browser. A kind of
Server-Push.
That is, If one client makes changes, then all of the other clients on the
web should get intimated.
How can I achieve this ?
thanks
vikas
I read the OP's message and imediately thought oh, cool, MVC candidate :-) If I wanna talk about MVC I would prefer Sun's Design Patterns group.
Kumar.
[email protected] wrote:
> "Mettu Kumar" <[email protected]> wrote in message
> news:[email protected]...
> > Ryan,
> >
> > I was not commenting on MVC pattern. I am talking about the problems
> > pushlets implementation could potentially cause.
>
> Mettu, we completly crossed paths my friend. I read the OP's message and
> imediately thought oh, cool, MVC candidate :-) Silly me! I understand what
> you are talking about now :-)
>
> > 1. If you are serving 10,000 clients, probably a given instance your
> server will
> > be serving 100 or 1000 of the them. but with pushlets you have 10, 000
> > conenctions open siumultaneously and your server is serving all the client
> 100%
> > of the time.
>
> No, you're right that isn't good.
>
> > Do you think this would scale? Imagine the number of threads on server.
> > 2. This could potentially bring down the web server you are using.
> >
>
> It would scale right up to the time the server came crashing down :-) Yes,
> if the server kept a single connection, thread of execution, open to every
> client while the client was running that would be not so hot indeed,
> especially if your clients increased exponentially. This is precisely why I
> like the callback method on each client, kind of a pain to implement though.
>
> >
> > Kumar.
> >
> > [email protected] wrote:
> >
> > > I wasn't referring to the article on pushlets you mentioned when I said
> the
> > > idea of MVC was a valid one, nor have I read the article as I respond
> but
> > > heres the idea I was describing which is based on the concept of MVC.
> It
> > > provides perfectly for the scenario the OP described IMO. I think, at
> least
> > > based on what I've seen, that the notion of MVC in the J2EE sector is
> used
> > > mostly as a means to seperate business logic from presentation logic.
> It
> > > doesn't allow for any mechanisms to notify the ``views" when data
> ``model"
> > > changes. This is no big deal I guess for most applications but it does
> > > break the MVC paradigm IMO. To aleiviate this problem we incorporate an
> > > observer pattern to notify each subscribing view when the model changes.
> > > There really isn't any difference in my mind between push and pull where
> > > pull is a standard RFC 2616 request and push is a simple callback to the
> > > object registered with the controller (servlet, jsp). If the server can
> > > handle a thousand or so concurrent requests why couldn't it handle a
> > > thousand concurrent callbacks. You could probably improve this by
> > > multi-threading the controller. Just some thoughts I would like to hear
> > > yours :-)
> > >
> > > ~Ryan
> > >
> > > "Mettu Kumar" <[email protected]> wrote in message
> > > news:[email protected]...
> > > > Ryan,
> > > >
> > > > Did you ever try to use to Pushlets serving thousands of clients?
> > > > Why did you think its a good design? If you feel its a good design,
> let
> > > us
> > > > know whats good about it.
> > > >
> > > > Kumar.
> > > >
> > > > [email protected] wrote:
> > > >
> > > > > "Mettu Kumar" <[email protected]> wrote in message
> > > > > news:[email protected]...
> > > > > > Vikas,
> > > > > >
> > > > > > There was a article about the same in java world a while back.
> > > > > > http://www.javaworld.com/javaworld/jw-03-2000/jw-03-pushlet.html
> > > > > >
> > > > > > But I believe this is bad design. I don't think using opened HTTP
> > > > > Connections
> > > > > > to do a real time operation is not a good Idea. What if you are
> > > serving
> > > > > couple
> > > > > > of hundred clients?
> > > > > >
> > > > > > Kumar.
> > > > > >
> > > > >
> > > > > It's a perfectly valid design. OP, check out MVC and the observer
> > > design
> > > > > pattern I think you'll find what you're looking for there.
> > > > >
> > > > > ~Ryan
> > > > >
> > > > > > Vikas Jolly wrote:
> > > > > >
> > > > > > > Hi AnyOne!
> > > > > > >
> > > > > > > I have a servlet, and a database . If a column in my table gets
> > > updated
> > > > > I
> > > > > > > want all of my clients who are connected to it , to see the
> > > refreshed
> > > > > value
> > > > > > > without click any refresh/Reload button on the browser. A kind
> of
> > > > > > > Server-Push.
> > > > > > > That is, If one client makes changes, then all of the other
> clients
> > > on
> > > > > the
> > > > > > > web should get intimated.
> > > > > > >
> > > > > > > How can I achieve this ?
> > > > > > >
> > > > > > > thanks
> > > > > > > vikas
> > > > > >
> > > >
> > > >
> >
-
How to configure my MDB serve only one message at a time?
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How to configure my JMS QUEUE serve only one message at a time?
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When i remove my transaction code, its work just fine no exception raise, but when i use then i.e. BEGIN TRAN, COMMITE TRAN, AND ROLLBACK TRAN. its giving me error, other wise its fine.
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thanks in advance.
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MilanSorry again, I am new on any kind of forum, so i am learning now, following is the error massage generated by SQL Server. and its not
an architecture problem, i had just included my complete architecture to be more informative while asking for the solution or suggestion. My real problem is T-SQL, i think and its related to Distributed queries raise in SQL Server in Oracle Link Server.
OLE DB provider "OraOLEDB.Oracle"
for linked server "ORCL" returned message "New transaction cannot enlist in the specified transaction coordinator. ".
Msg 50000, Level 16, State 2, Procedure PROC_MIGRATE_MST_FRM_ORA_SQLSERVER,
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The operation could not be performed because OLE
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