LocalDate and D2W redux
Hello,
Back in December 2011, in this thread:
http://lists.apple.com/archives/webobjects-dev/2011/Dec/msg00440.html
Ramsey described a method for binding an ERXJodaLocalTimeFormatter to (I
assume) an ERD2WEditString component with this rule:
10 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and smartAttribute.className =
'org.joda.time.LocalTime') = formatObject = {arguments = ({className =
java.lang.String; contextKey = formatter; }, {className =
java.util.Locale; contextKey = session.localizer.@locale; },
{className = java.util.TimeZone; contextKey = session.timeZone; });
className = er.extensions.formatters.ERXJodaLocalTimeFormatter; }
[ERDDelayedObjectCreationAssignment]
Firstly, is that still the state of the art, or is there a better way to do it
now? Secondly, Ramsey, should that work just as well substituting
'org.joda.time.LocalDate' and
'er.extensions.formatters.ERXJodaLocalDateFormatter' above? Both questions
arise because that's what I've tried, and I cannot get it to work for the life
of me. Specifically, I have these rules:
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') =
componentName = ERD2WEditString [com.webobjects.directtoweb.Assignment]
50 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and smartAttribute.className =
'org.joda.time.LocalDate') = formatObject = {arguments = ({className =
java.lang.String; contextKey = formatter; }, {className =
java.util.Locale; contextKey = session.localizer.@locale; }, {className
= java.util.TimeZone; contextKey = session.timeZone; }); className =
er.extensions.formatters.ERXJodaLocalDateFormatter; }
[ERDDelayedObjectCreationAssigment]
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') = formatter =
d2wContext.formatObject [com.webobjects.directtoweb.Assignment]
Yet there's no 'formatter' binding when I hover over the invoiceDate field, and
I continue to get an exception complaining about not having a formatter.
--
Paul Hoadley
http://logicsquad.net/
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Re: LocalDate and D2W redux
The component I'm using isn't in wonder. Have a look at R2D2WEditDate.
https://github.com/nullterminated/ponder/tree/master/ERR2d2w
Ramsey
On Jun 12, 2012, at 4:18 AM, Paul Hoadley wrote:
Hello,
Back in December 2011, in this thread:
http://lists.apple.com/archives/webobjects-dev/2011/Dec/msg00440.html
Ramsey described a method for binding an ERXJodaLocalTimeFormatter to (I
assume) an ERD2WEditString component with this rule:
10 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and smartAttribute.className =
'org.joda.time.LocalTime') = formatObject = {arguments = ({className =
java.lang.String; contextKey = formatter; }, {className =
java.util.Locale; contextKey = session.localizer.@locale; },
{className = java.util.TimeZone; contextKey = session.timeZone; });
className = er.extensions.formatters.ERXJodaLocalTimeFormatter; }
[ERDDelayedObjectCreationAssignment]
Firstly, is that still the state of the art, or is there a better way to do
it now? Secondly, Ramsey, should that work just as well substituting
'org.joda.time.LocalDate' and
'er.extensions.formatters.ERXJodaLocalDateFormatter' above? Both questions
arise because that's what I've tried, and I cannot get it to work for the
life of me. Specifically, I have these rules:
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') =
componentName = ERD2WEditString [com.webobjects.directtoweb.Assignment]
50 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and smartAttribute.className =
'org.joda.time.LocalDate') = formatObject = {arguments = ({className =
java.lang.String; contextKey = formatter; }, {className =
java.util.Locale; contextKey = session.localizer.@locale; },
{className = java.util.TimeZone; contextKey = session.timeZone; });
className = er.extensions.formatters.ERXJodaLocalDateFormatter; }
[ERDDelayedObjectCreationAssigment]
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') = formatter
= d2wContext.formatObject [com.webobjects.directtoweb.Assignment]
Yet there's no 'formatter' binding when I hover over the invoiceDate field,
and I continue to get an exception complaining about not having a formatter.
--
Paul Hoadley
http://logicsquad.net/
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Re: failed to find a snapshot for EO with Global ID
Ah, so it's the garbage collection that's triggering it. I should have known,
given the looping worked for small values. This is good. I can distill the
failure down to a single pair of EOs using System.gc() now. This should make
it a lot easier to investigate.
public void testNestedECs() {
try {
EOEditingContext ec = ERXEC.newEditingContext();
Company c = (Company) EOUtilities.createAndInsertInstance(ec,
Company.ENTITY_NAME);
c.setName(Name);
ec.saveChanges();
EOEditingContext nested = ERXEC.newEditingContext(ec);
Company nestC = c.localInstanceIn(nested);
Employee e = (Employee)
EOUtilities.createAndInsertInstance(nested, Employee.ENTITY_NAME);
e.setFirstName(First);
e.setLastName(Last);
e.setManager(Boolean.FALSE);
e.addObjectToBothSidesOfRelationshipWithKey(nestC,
Employee.COMPANY_KEY);
nested.saveChanges();
ec.saveChanges();
System.gc();
c.delete();
ec.saveChanges();
} catch (Exception e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
Thanks Alexis,
Ramsey
On Jun 11, 2012, at 8:05 PM, Alexis Tual wrote:
Hi Ramsey,
this bug sounds very familiar...
In your code, ec.setRetainsRegisteredObjects(true) should do the job, but
that eats memory.
For more details, see
http://lists.apple.com/archives/webobjects-dev/2010/Nov/msg9.html, Mike
said :
I don't have a patch you can easily apply. The workaround on your
side is to not let the EO in the parent EC garbage collect
(basically, keep a reference to the parent EO around for any EO
that you fault into child EC).
Good luck on this,
Alex
2012/6/12 Ramsey Gurley rgur...@smarthealth.com
Hi all,
I have a suspicion that something is wrong with the way nested ECs are
currently working. The errors I see are the result of missing snapshots. The
errors are very sporadic and hard to reproduce. I've managed to distill this
down to a simple test case. If I drop this:
public void testNestedECs() {
try {
EOEditingContext ec = ERXEC.newEditingContext();
for(int i = 0; i 100; i++) {
Company c = (Company)
EOUtilities.createAndInsertInstance(ec, Company.ENTITY_NAME);
c.setName(UUID.randomUUID().toString());
ec.saveChanges();
EOEditingContext nested = ERXEC.newEditingContext(ec);
Company nestC = c.localInstanceIn(nested);
for(int j = 0; j 10; j++) {
Employee e = (Employee)
EOUtilities.createAndInsertInstance(nested, Employee.ENTITY_NAME);
e.setFirstName(UUID.randomUUID().toString());
e.setLastName(UUID.randomUUID().toString());
e.setManager(Boolean.FALSE);
e.addObjectToBothSidesOfRelationshipWithKey(nestC, Employee.COMPANY_KEY);
nested.saveChanges();
ec.saveChanges();
}
c.delete();
ec.saveChanges(); //Line 78
}
} catch (Exception e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
into ERXECTest.java, I get fairly reliable failures due to missing snapshots.
java.lang.IllegalStateException: recordDeleteForObject:
com.webobjects.eoaccess.EODatabaseContext
com.webobjects.eoaccess.EODatabaseContext@489bb457 failed to find a snapshot
for EO with Global ID:_EOIntegralKeyGlobalID[Employee (java.lang.Integer)491]
that has been deleted from
er.extensions.eof.ERXECer.extensions.eof.ERXEC@44581ea2. Cannot delete an
object that has not been fetched from the database
at
com.webobjects.eoaccess.EODatabaseContext.recordDeleteForObject(EODatabaseContext.java:4732)
at
com.webobjects.eoaccess.EODatabaseContext.recordChangesInEditingContext(EODatabaseContext.java:5890)
at
com.webobjects.eocontrol.EOObjectStoreCoordinator.saveChangesInEditingContext(EOObjectStoreCoordinator.java:373)
at
com.webobjects.eocontrol.EOEditingContext.saveChanges(EOEditingContext.java:3192)
at er.extensions.eof.ERXEC._saveChanges(ERXEC.java:1177)
at er.extensions.eof.ERXEC.saveChanges(ERXEC.java:1100)
at er.extensions.eof.ERXECTest.testNestedECs(ERXECTest.java:78)
If I drop the number of loops down to 10 instead of 100, I don't see the
exceptions. Does anyone see an obvious problem with my test case or perhaps
have ideas about what's going wrong before I begin digging? :-)
Ramsey
Re: LocalDate and D2W redux
When we model a new EOModel is the recommendation to use jodaLocalDateTime???
or it depends?
--
Paul Yu
Sent with Sparrow (http://www.sparrowmailapp.com/?sig)
On Tuesday, June 12, 2012 at 11:08 AM, Ramsey Gurley wrote:
The component I'm using isn't in wonder. Have a look at R2D2WEditDate.
https://github.com/nullterminated/ponder/tree/master/ERR2d2w
Ramsey
On Jun 12, 2012, at 4:18 AM, Paul Hoadley wrote:
Hello,
Back in December 2011, in this thread:
http://lists.apple.com/archives/webobjects-dev/2011/Dec/msg00440.html
Ramsey described a method for binding an ERXJodaLocalTimeFormatter to (I
assume) an ERD2WEditString component with this rule:
10 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and
smartAttribute.className = 'org.joda.time.LocalTime') = formatObject =
{arguments = ({className = java.lang.String; contextKey =
formatter; }, {className = java.util.Locale; contextKey =
session.localizer.@locale; }, {className = java.util.TimeZone;
contextKey = session.timeZone; }); className =
er.extensions.formatters.ERXJodaLocalTimeFormatter; }
[ERDDelayedObjectCreationAssignment]
Firstly, is that still the state of the art, or is there a better way to do
it now? Secondly, Ramsey, should that work just as well substituting
'org.joda.time.LocalDate' and
'er.extensions.formatters.ERXJodaLocalDateFormatter' above? Both questions
arise because that's what I've tried, and I cannot get it to work for the
life of me. Specifically, I have these rules:
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') =
componentName = ERD2WEditString [com.webobjects.directtoweb.Assignment
(http://web.Assignment)]
50 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and smartAttribute.className
= 'org.joda.time.LocalDate') = formatObject = {arguments = ({className
= java.lang.String; contextKey = formatter; }, {className =
java.util.Locale; contextKey = session.localizer.@locale; },
{className = java.util.TimeZone; contextKey = session.timeZone; });
className = er.extensions.formatters.ERXJodaLocalDateFormatter; }
[ERDDelayedObjectCreationAssigment]
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') =
formatter = d2wContext.formatObject
[com.webobjects.directtoweb.Assignment (http://web.Assignment)]
Yet there's no 'formatter' binding when I hover over the invoiceDate field,
and I continue to get an exception complaining about not having a formatter.
--
Paul Hoadley
http://logicsquad.net/
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Re: LocalDate and D2W redux
Depends on whether you need the time zone or not.
Let's say you want to say Walmart's black friday sale begins at 12 am on the
Friday after Thanksgiving. You'd model that as a LocalDateTime because it's a
date and time that is not specific to any time zone. East coast stores start
their sale 3 hours earlier than west coast stores because of the time zone
difference.
Similar for birthdate, but that's typically represented as LocalDate instead.
You'd use LocalTime to model something like tea time or happy hour at the pub :D
DateTime or NSTimestamp are the only ones that use timezones. If you need a
global time stamp to indicate when an event occurs, then you'd go with one of
these. The NYSE opens at 9am Eastern time this morning. If you're in
California, it doesn't wait three hours for you to wake up :-)
Ramsey
On Jun 12, 2012, at 8:28 AM, Paul Yu wrote:
When we model a new EOModel is the recommendation to use jodaLocalDateTime???
or it depends?
--
Paul Yu
Sent with Sparrow
On Tuesday, June 12, 2012 at 11:08 AM, Ramsey Gurley wrote:
The component I'm using isn't in wonder. Have a look at R2D2WEditDate.
https://github.com/nullterminated/ponder/tree/master/ERR2d2w
Ramsey
On Jun 12, 2012, at 4:18 AM, Paul Hoadley wrote:
Hello,
Back in December 2011, in this thread:
http://lists.apple.com/archives/webobjects-dev/2011/Dec/msg00440.html
Ramsey described a method for binding an ERXJodaLocalTimeFormatter to (I
assume) an ERD2WEditString component with this rule:
10 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and smartAttribute.className
= 'org.joda.time.LocalTime') = formatObject = {arguments =
({className = java.lang.String; contextKey = formatter; },
{className = java.util.Locale; contextKey =
session.localizer.@locale; }, {className = java.util.TimeZone;
contextKey = session.timeZone; }); className =
er.extensions.formatters.ERXJodaLocalTimeFormatter; }
[ERDDelayedObjectCreationAssignment]
Firstly, is that still the state of the art, or is there a better way to do
it now? Secondly, Ramsey, should that work just as well substituting
'org.joda.time.LocalDate' and
'er.extensions.formatters.ERXJodaLocalDateFormatter' above? Both questions
arise because that's what I've tried, and I cannot get it to work for the
life of me. Specifically, I have these rules:
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') =
componentName = ERD2WEditString [com.webobjects.directtoweb.Assignment]
50 : ((smartAttribute.valueFactoryMethod != null and
smartAttribute.factoryMethodArgumentType = 3) and smartAttribute.className
= 'org.joda.time.LocalDate') = formatObject = {arguments = ({className
= java.lang.String; contextKey = formatter; }, {className =
java.util.Locale; contextKey = session.localizer.@locale; },
{className = java.util.TimeZone; contextKey = session.timeZone; });
className = er.extensions.formatters.ERXJodaLocalDateFormatter; }
[ERDDelayedObjectCreationAssigment]
100 : (entity.name = 'Invoice' and propertyKey = 'invoiceDate') =
formatter = d2wContext.formatObject
[com.webobjects.directtoweb.Assignment]
Yet there's no 'formatter' binding when I hover over the invoiceDate field,
and I continue to get an exception complaining about not having a formatter.
--
Paul Hoadley
http://logicsquad.net/
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Re: LocalDate and D2W redux
an invoice has a date that doesn't change because you are looking at it in CA instead of NY Message: 3 Date: Tue, 12 Jun 2012 08:47:08 -0700 From: Ramsey Gurley ramseygur...@gmail.com To: Paul Yu p...@mac.com Cc: WebObjects Development webobjects-dev@lists.apple.com Subject: Re: LocalDate and D2W redux Message-ID: 233aae12-a22a-49f4-a23c-bd020b83b...@gmail.com Content-Type: text/plain; charset=utf-8 Depends on whether you need the time zone or not. Let's say you want to say Walmart's black friday sale begins at 12 am on the Friday after Thanksgiving. You'd model that as a LocalDateTime because it's a date and time that is not specific to any time zone. East coast stores start their sale 3 hours earlier than west coast stores because of the time zone difference. Similar for birthdate, but that's typically represented as LocalDate instead. You'd use LocalTime to model something like tea time or happy hour at the pub :D DateTime or NSTimestamp are the only ones that use timezones. If you need a global time stamp to indicate when an event occurs, then you'd go with one of these. The NYSE opens at 9am Eastern time this morning. If you're in California, it doesn't wait three hours for you to wake up :-) Ramsey ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: failed to find a snapshot for EO with Global ID
I'm very curious to see your findings. One of our WO apps have had this
problem for years but it happens so infrequently that the users don't seem to
be bothered. It bothers me though. argh.
On 2012-06-12, at 11:47 AM, webobjects-dev-requ...@lists.apple.com
webobjects-dev-requ...@lists.apple.com wrote:
Ah, so it's the garbage collection that's triggering it. I should have known,
given the looping worked for small values. This is good. I can distill the
failure down to a single pair of EOs using System.gc() now. This should make
it a lot easier to investigate.
public void testNestedECs() {
try {
EOEditingContext ec = ERXEC.newEditingContext();
Company c = (Company) EOUtilities.createAndInsertInstance(ec,
Company.ENTITY_NAME);
c.setName(Name);
ec.saveChanges();
EOEditingContext nested = ERXEC.newEditingContext(ec);
Company nestC = c.localInstanceIn(nested);
Employee e = (Employee)
EOUtilities.createAndInsertInstance(nested, Employee.ENTITY_NAME);
e.setFirstName(First);
e.setLastName(Last);
e.setManager(Boolean.FALSE);
e.addObjectToBothSidesOfRelationshipWithKey(nestC,
Employee.COMPANY_KEY);
nested.saveChanges();
ec.saveChanges();
System.gc();
c.delete();
ec.saveChanges();
} catch (Exception e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
Thanks Alexis,
Ramsey
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rackspace, centos and WO
Has anyone successfully set up WO on a rackspace cloud server? I finally got Apache up and running but I keep running into problems with WO and where it lives and I think I am just confusing myself. Ted ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: rackspace, centos and WO
Should not be different than another CentOS Linux installation (I do have a RackSpace VM that I only used to test). What is the exact problem? Has anyone successfully set up WO on a rackspace cloud server? I finally got Apache up and running but I keep running into problems with WO and where it lives and I think I am just confusing myself. Ted ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/probert%40macti.ca This email sent to prob...@macti.ca ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: failed to find a snapshot for EO with Global ID
I'm also very curious about Ramsey's investigations because when this bug
happens, you have to basically toss your EC stack...
Alex
2012/6/13 Calven Eggert cegg...@uhnresearch.ca
I'm very curious to see your findings. One of our WO apps have had this
problem for years but it happens so infrequently that the users don't seem
to be bothered. It bothers me though. argh.
On 2012-06-12, at 11:47 AM, webobjects-dev-requ...@lists.apple.com
webobjects-dev-requ...@lists.apple.com wrote:
Ah, so it's the garbage collection that's triggering it. I should have
known, given the looping worked for small values. This is good. I can
distill the failure down to a single pair of EOs using System.gc() now.
This should make it a lot easier to investigate.
public void testNestedECs() {
try {
EOEditingContext ec = ERXEC.newEditingContext();
Company c = (Company) EOUtilities.createAndInsertInstance(ec,
Company.ENTITY_NAME);
c.setName(Name);
ec.saveChanges();
EOEditingContext nested = ERXEC.newEditingContext(ec);
Company nestC = c.localInstanceIn(nested);
Employee e = (Employee) EOUtilities.createAndInsertInstance(nested,
Employee.ENTITY_NAME);
e.setFirstName(First);
e.setLastName(Last);
e.setManager(Boolean.FALSE);
e.addObjectToBothSidesOfRelationshipWithKey(nestC, Employee.
COMPANY_KEY);
nested.saveChanges();
ec.saveChanges();
System.gc();
c.delete();
ec.saveChanges();
} catch (Exception e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
}
Thanks Alexis,
Ramsey
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Re: LocalDate and D2W redux
On 13/06/2012, at 12:38 AM, Ramsey Gurley wrote: The component I'm using isn't in wonder. Have a look at R2D2WEditDate. https://github.com/nullterminated/ponder/tree/master/ERR2d2w Thanks Ramsey, I will take a look. -- Paul. http://logicsquad.net/ ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Wonder apps under AWS ELB with sticky sessions, autoscaling EC2 instances.
Hello list! I've been working on a number of wonder applications the last year at my 9-5, all of which we have deployed to AWS in various development and staging/QA states. For the production environment of the main application, we are looking at a deployment setup quite similar to this reference diagram: http://d36cz9buwru1tt.cloudfront.net/architecturecenter/AWS_ac_ra_web_01.pdf (from http://aws.amazon.com/architecture/) It's important to the company to ensure we can run smoothly across multiple Availability Zones of a Region, so the diagram represents the 3 (+1) tier application setup we are looking for. We're really happy with the approach we've taken so far, and the ELB-session-stickiness and autoscaling of the application tiers in each AZ is something we are currently evaluating. Ignoring CloudFront and Route 53 for a moment, we're interested in setting up the ELB with sticky sessions/session affinity, apache on each AZ, and a number of application VMs on each AZ, each one of course running a number of WO instances. The persistence tier is absolutely fine and accounted for in both AZs. So two quick questions: 1. Has anyone had any experience with ELB and sticky sessions with regards to WO, WOMonitor, and wotaskd? If so, are there any gotchas or hurdles you foresee me coming across? Any tips for smooth sailing? Tied (or apposed really) to this is the concept of distributed session storage, which we are also considering, so I'm looking forward to your WOWODC session, Ramsey! 2. Currently we're looking at manual horizontal scaling of the application tiers in each AZ, but it would be great to design/have a solution for triggered horizontal EC2 VM scaling with respect to WO. This would presumably require updating the WOMonitor and wotaskd. Again, any one with previous experience wanting to warn me off/enthusiastically give me hope? Any knowledge in this area would be greatly appreciated! Cheers, and see you all at WOWODC. -- Matt http://logicsquad.net/ ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Wonder apps under AWS ELB with sticky sessions, autoscaling EC2 instances.
we had problems with elb, wo and sticky sessions. we now run zeus load balancers on ec2. we never got to the bottom of it, just randomly the session would seem to loose it's stickyness, head off to another ec2 instance, new session and login page. i suspected it was due to switching between http and https and we intend to re-trial elb in a few months time because we are moving all of our apps to full-time https and secure cookies. sorry, not much help i know, but just a heads up that we did have problems. i'd be interested in knowing how you get on... simon On 12 June 2012 23:24, Matthew Ness m...@logicsquad.net wrote: Hello list! I've been working on a number of wonder applications the last year at my 9-5, all of which we have deployed to AWS in various development and staging/QA states. For the production environment of the main application, we are looking at a deployment setup quite similar to this reference diagram: http://d36cz9buwru1tt.cloudfront.net/architecturecenter/AWS_ac_ra_web_01.pdf (from http://aws.amazon.com/architecture/) It's important to the company to ensure we can run smoothly across multiple Availability Zones of a Region, so the diagram represents the 3 (+1) tier application setup we are looking for. We're really happy with the approach we've taken so far, and the ELB-session-stickiness and autoscaling of the application tiers in each AZ is something we are currently evaluating. Ignoring CloudFront and Route 53 for a moment, we're interested in setting up the ELB with sticky sessions/session affinity, apache on each AZ, and a number of application VMs on each AZ, each one of course running a number of WO instances. The persistence tier is absolutely fine and accounted for in both AZs. So two quick questions: 1. Has anyone had any experience with ELB and sticky sessions with regards to WO, WOMonitor, and wotaskd? If so, are there any gotchas or hurdles you foresee me coming across? Any tips for smooth sailing? Tied (or apposed really) to this is the concept of distributed session storage, which we are also considering, so I'm looking forward to your WOWODC session, Ramsey! 2. Currently we're looking at manual horizontal scaling of the application tiers in each AZ, but it would be great to design/have a solution for triggered horizontal EC2 VM scaling with respect to WO. This would presumably require updating the WOMonitor and wotaskd. Again, any one with previous experience wanting to warn me off/enthusiastically give me hope? Any knowledge in this area would be greatly appreciated! Cheers, and see you all at WOWODC. -- Matt http://logicsquad.net/ ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/simon%40potwells.co.uk This email sent to si...@potwells.co.uk ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Wonder apps under AWS ELB with sticky sessions, autoscaling EC2 instances.
Thanks Simon, We'll be running https full-time, so we'll have an evaluation period and I'll let you know how we go. Will you be at WOWODC? -- Matt http://logicsquad.net/ we had problems with elb, wo and sticky sessions. we now run zeus load balancers on ec2. we never got to the bottom of it, just randomly the session would seem to loose it's stickyness, head off to another ec2 instance, new session and login page. i suspected it was due to switching between http and https and we intend to re-trial elb in a few months time because we are moving all of our apps to full-time https and secure cookies. sorry, not much help i know, but just a heads up that we did have problems. i'd be interested in knowing how you get on... simon On 12 June 2012 23:24, Matthew Ness m...@logicsquad.net wrote: Hello list! I've been working on a number of wonder applications the last year at my 9-5, all of which we have deployed to AWS in various development and staging/QA states. For the production environment of the main application, we are looking at a deployment setup quite similar to this reference diagram: http://d36cz9buwru1tt.cloudfront.net/architecturecenter/AWS_ac_ra_web_01.pdf (from http://aws.amazon.com/architecture/) It's important to the company to ensure we can run smoothly across multiple Availability Zones of a Region, so the diagram represents the 3 (+1) tier application setup we are looking for. We're really happy with the approach we've taken so far, and the ELB-session-stickiness and autoscaling of the application tiers in each AZ is something we are currently evaluating. Ignoring CloudFront and Route 53 for a moment, we're interested in setting up the ELB with sticky sessions/session affinity, apache on each AZ, and a number of application VMs on each AZ, each one of course running a number of WO instances. The persistence tier is absolutely fine and accounted for in both AZs. So two quick questions: 1. Has anyone had any experience with ELB and sticky sessions with regards to WO, WOMonitor, and wotaskd? If so, are there any gotchas or hurdles you foresee me coming across? Any tips for smooth sailing? Tied (or apposed really) to this is the concept of distributed session storage, which we are also considering, so I'm looking forward to your WOWODC session, Ramsey! 2. Currently we're looking at manual horizontal scaling of the application tiers in each AZ, but it would be great to design/have a solution for triggered horizontal EC2 VM scaling with respect to WO. This would presumably require updating the WOMonitor and wotaskd. Again, any one with previous experience wanting to warn me off/enthusiastically give me hope? Any knowledge in this area would be greatly appreciated! Cheers, and see you all at WOWODC. -- Matt http://logicsquad.net/ ___ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
