Operation is not valid due to the current state of the object.

[Kyle Heon]

We have a task (C#/ASP.NET) that connects to our Couchbase server for data that is reported on. We are finding that out of the gate, after an iisreset the task runs to completion without any issues but on subsequent executions it fails. The logs indicate the following issue:

System.Exception: PageVisitLogger::GetPageVisits return PageVisitRepository.GetPageVisits ---> System.InvalidOperationException: Operation is not valid due to the current state of the object.
   at Couchbase.CouchbaseViewHandler.GetResponse(IDictionary`2 viewParams)
   at Couchbase.CouchbaseViewHandler.<TransformResults>d__0`1.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at OurAssembly.Framework.Tracking.PageVisitLogger.GetPageVisits(String userId, Boolean refresh)
   --- End of inner exception stack trace ---

We are using the following setup for creating the Couchbase client (and I've verified that it isn't the client that has somehow gone null):

public CouchbaseClient CouchbaseClient

{

    get

    {

        if (null != HttpContext.Current)

        {

            var ctx = HttpContext.Current.ApplicationInstance.Context;

            if (!ctx.Items.Contains(CouchbaseClientKey))

            {

                ctx.Items[CouchbaseClientKey] = new CouchbaseClient();

            }

            var client = ctx.Items[CouchbaseClientKey] as CouchbaseClient;

            if (null != client) return client;

        }

        return new CouchbaseClient();

    }

}

 The code calling Coubhase looks like this:

public IEnumerable<PageVisit> GetPageVisits(string userId)

{

    var visits =

        this.CouchbaseClient.GetView("digital_campus_pagevisits", "digital_campus_pagevisits")

            .Key(userId)

            .Stale(StaleMode.False);

    return visits.Select(visit => Get(visit.ItemId));

}

I'm at a loss now to figure out what is causing this error and could use some assistance because obviously restarting IIS before this task runs is out of the question.

-K 

[Perry Krug]

Kyle, I saw something similar to this in another environment so may very well be a bug that we need to address.

A few things:

-Can you implement logging on the client and send that over?

-Can you try with "stalemode.true" instead of false?

Perry Krug

perr...@gmail.com

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[Kyle Heon]

Perry,

This issue was happening last week, I just added the Stale property so it's not that. I have actually identified that this issue is in SDK 1.2.6. I just reverted back to our previous build (original 1.2 I believe) and I don't see this issue.

What I'm trying to do now is determine if it's the SDK or the removal of the Hammock HttpClient from configuration.

-K

[Perry Krug]

Thanks for that information Kyle.  Logs would still be helpful from 1.2.6 so we can help identify the issue as well.

Perry Krug

perr...@gmail.com

-K

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[Kyle Heon]

Perry,

I'll try but I'm under the pressure of an already late deadline. If I can't get this configured quickly I'm going to have to revert to our previous SDK build. I'll do what I can, maybe even get you this data when things aren't so crazy. Obviously I want to be running with the latest SDK so I'd like to get to the bottom of this...

-K

[Perry Krug]

Understand completely Kyle.  I would say that having logging configured and easily enabled in your application and development environments would be a good practice overall moving forward.

Perry Krug

perr...@gmail.com

-K

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[Kyle Heon]

Perry,

I reverted back to the latest 1.2.6 and added logging as you requested. I'm attaching the log file, as you can see there are hundreds of the same error, those all occur after the first run through. Meaning I load the page once and everything works, if I reload the page there are errors.

If you know what the issue is and have a workaround for me I'll try and hold off on doing a build in the hopes that I can get this resolved and continue to use 1.2.6 otherwise I'm going to have to go back to 1.2.0.

-K

[Perry Krug]

Thank you Kyle.  Is that the entire log file?  It seems to be missing a bit of context...and/or can you set the log level to something more like INFO or DEBUG?

Perry Krug

perr...@gmail.com

-K

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[Kyle Heon]

Perry,

Yes, that was the full log and was INFO. I updated configuration so that it wrote out DEBUG and that provides a lot more data for you. I've attached the log file (zipped). You should be able to see where things go off the rails.

-K

[Perry Krug]

Great, thanks Kyle.

Perry Krug

perr...@gmail.com

-K

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[Kyle Heon]

Perry,

You are welcome, I hope that I'm able to help you solve this issue if it is indeed an issue. I have to revert to the 1.2.0 SDK for now and do another build to our testing environment so users can be testing the site. I'm going to try and continue working through this with you after that because I'd prefer to ship with SDK 1.2.6 connected to Couchbase 2.0.1.

I'm attaching a log file from two back to back runs with the 1.2.0 SDK in the hopes that will help as well. It's twice the size which makes sense as the task ran to completion twice.

Let me know what you find.

-K

[Kyle Heon]

Did you find anything of interest in the logs Perry? Anything I can do to work around this issue and continue to use 1.2.6?

-K

[Kyle Heon]

Hey Perry,

Any update on your findings from the diagnostics I provided? We've launched our 2.1 release using the old 1.2.0 SDK due to the issues we ran into with 1.2.6. We have started development on our new 2.2 release (scheduled for a mid-October launch) and I'd love to be able to update to the latest .NET SDK as part of this upcoming release.

Thanks again for your assistance.

-K

[Tugdual]

Hello Kyle,

So you have 2 different issues:

- with 1.2.6 : 

----

System.Exception: PageVisitLogger::GetPageVisits return PageVisitRepository.GetPageVisits ---> System.InvalidOperationException: Operation is not valid due to the current state of the object.

   at Couchbase.CouchbaseViewHandler.GetResponse(IDictionary`2 viewParams)

   at Couchbase.CouchbaseViewHandler.<TransformResults>d__0`1.MoveNext()

   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()

   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)

   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

   at OurAssembly.Framework.Tracking.PageVisitLogger.GetPageVisits(String userId, Boolean refresh)

   --- End of inner exception stack trace ---

-----

- with 1.2.0 : cannot execute view:

---

2013-06-06 11:25:07.6744|DEBUG|Couchbase.MessageStreamListener|HB: Node 'http://localhost:8091/pools/default' is OK

2013-06-06 11:25:13.4970|INFO|Couchbase.CouchbasePool|Received new configuration.

2013-06-06 11:25:13.4970|INFO|Couchbase.CouchbasePool|Has vbucket. Server count: 1

2013-06-06 11:25:13.4970|DEBUG|Couchbase.CouchbasePool|Found address 127.0.0.1 for 127.0.0.1

2013-06-06 11:25:13.4970|DEBUG|Couchbase.CouchbasePool|Using address 127.0.0.1 for 127.0.0.1

2013-06-06 11:25:13.4970|ERROR|Couchbase.CouchbasePool|Failed to initialize the pool.

2013-06-06 11:25:13.4970|DEBUG|Couchbase.CouchbaseClient|No working nodes found. Unable to execute view query

2013-06-06 11:25:13.4970|WARN|Couchbase.CouchbaseViewHandler|View Couchbase.CouchbaseViewHandler was mapped to a dead node, failing.

----

Do you see anything on the Couchabse Server log itself? it looks like your server is going down/not visible for a while...

Have you tried to use a remote server/cluster from your application?

Regards

Tug

@tgrall

[Kyle Heon]

Tugdual,

Sorry, somehow I missed this reply from you. I just noticed this morning that there is a new Couchbase .NET SDK (1.2.7) and the release notes (http://www.couchbase.com/docs/couchbase-sdk-net-1.2/couchbase-sdk-net-rn_1-2-7a.html) seem to indicate that a fix for our issue with 1.2.6 was included (NCBC-278: Lock WebClient when getting WebRequest). Can anyone at Couchbase confirm this?

-K