[Internal] FFCF: Initial PR for AllVersionsAndDeletes #4003

iainx · 2023-07-24T15:10:29Z

Description

WIP initial PR for comments

Waiting for a final API before writing full documentation and tests

Full Documentation (current documentation is minimal to fix build)
Tests

API example

var builder = container.GetAllVersionsChangeFeedProcessorBuilder<CartAction>("migrationProcessor", (ChangeFeedProcessorContext context, IReadOnlyCollection <ChangeFeedItemChange<CartAction>> changes, CancellationToken cancellationToken) =>
{
    Console.WriteLine(changes.Count + " Changes Received");


    foreach (var change in changes)
    {
    }
}

iainx · 2023-07-24T15:14:33Z

Seems like there's some line endings been messed up somewhere, will fix

iainx · 2023-07-25T11:12:22Z

Seems like there's some line endings been messed up somewhere, will fix

Fixed now, wasn't line endings or indentation, not sure why Git felt the whole file had changed

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/Observers/ChangeFeedObserverFactoryCore.cs

jcocchi · 2023-07-26T15:13:21Z

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/Observers/ChangeFeedObserverFactoryCore.cs

@@ -111,6 +125,25 @@ public override ChangeFeedObserver CreateObserver()
            return this.onChangesWithManualCheckpoint(context, changes, context.CheckpointAsync, cancellationToken);
        }

+        private Task AllVersionsAndDeleteStreamHandlerAsync(


Delete --> Deletes. Similar feedback on other names that have the singular form of delete

@iainx looks like you marked this comment as resolved but the name still uses a singular "Delete". I think this should be "AllVersionsAndDeletesStreamHandlerAsync"

…os-dotnet-v3 into dev/iainx/alldelete-wip

…correctly by EncryptionContainer. Having it be abstract meant that it needed to be implemented when PREVIEW was true and false, but when PREVIEW was false, some types were internal and Microsoft.Azure.Cosmos.Encryption did not have access to them.

philipthomas-MSFT · 2023-07-25T15:55:55Z

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedProcessorItem.cs

+    /// An item representing a document change
+    /// </summary>
+    /// <typeparam name="T">The document type</typeparam>
+    public sealed class ChangeFeedProcessorItem<T>


We already have this when doing the pull model work.

Microsoft.Azure.Cosmos/src/Resource/FullFidelity/ChangeFeedItemChange{T}.cs

I've given this feedback before, but I think we should rename this class to "ChangeFeedItem", "ChangeFeedItemChange" is repetitive and confusing IMO

Yes, we should, but I'd prefer to do that in a separate PR because it affects the whole of the ChangeFeedProcessor and would make this PR more confusing.

+1 on that changing this in another PR.

philipthomas-MSFT · 2023-10-03T17:30:23Z

Microsoft.Azure.Cosmos/src/Resource/Container/Container.cs

+#else
+        internal
+#endif
+        virtual ChangeFeedProcessorBuilder GetAllVersionsChangeFeedProcessorBuilder<T>(


Can we be consistent here. GetAllVersionsAndDeletesChangeFeedProcessorBuilder? And why do we need this if this is only going to throw a NotImplementedException?

Because of how the Encryption module is implemented.

This can't be abstract as that would mean it needs to be implemented by the EncryptionContainer subclass, but because Microsoft.Azure.CosmosDB doesn't expose its internals to Microsoft.Azure.CosmosDB.Encryption EncryptionContainer can only implement this is PREVIEW is set. That means, if PREVIEW is not set, a build error happens because an abstract method isn't implemented.

Making this method virtual with an empty body fixes that, which looks and feels weird and wrong but that's a side effect of the way Microsoft.Azure.CosmosDB.Encryption is using Microsoft.Azure.CosmosDB as a PackageReference and not a ProjectReference

Dang GetAllVersionsAndDeletesChangeFeedProcessorBuilder is long :D

Should we consider shortening to GetAllVersionsAndDeletesCFPBuilder? I'm not sure if there's guidelines against using acronyms

Well, it would be a bit inconsistent, some called ChangeFeedProcessor and others CFP :/

Yeah I think we have to live with the long name or pass the mode as a parameter. BTW, Java exposes all versions and deletes as a separate method reusing the same builder, not sure if this would apply to .NET/ simplify creation

Went with GetChangeFeedProcessorBuilderWithAllVersionsAndDeletes following other similar method naming conventions.

philipthomas-MSFT · 2023-10-03T17:32:22Z

Microsoft.Azure.Cosmos/src/Resource/Container/ContainerCore.Items.cs

@@ -577,7 +577,8 @@ internal abstract partial class ContainerCore : ContainerInternal
            ChangeFeedObserverFactory observerFactory = new CheckpointerObserverFactory(
                new ChangeFeedObserverFactoryCore<T>(onChangesDelegate, this.ClientContext.SerializerCore),
                withManualCheckpointing: false);
-            return this.GetChangeFeedProcessorBuilderPrivate(processorName, observerFactory);
+            return this.GetChangeFeedProcessorBuilderPrivate(processorName,
+                observerFactory, ChangeFeedMode.Incremental);


Any reason why we are defaulting this to Incremental?

+1, all "Incremental" should use "LatestVersion" instead as this is the new name

philipthomas-MSFT · 2023-10-03T17:33:01Z

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedEstimatorIterator.cs

@@ -54,6 +54,7 @@ internal sealed class ChangeFeedEstimatorIterator : FeedIterator<ChangeFeedProce
                  changeFeedEstimatorRequestOptions,
                  (DocumentServiceLease lease, string continuationToken, bool startFromBeginning) => ChangeFeedPartitionKeyResultSetIteratorCore.Create(
                          lease: lease,
+                          mode: ChangeFeedMode.LatestVersion,


Why are we defaulting to LatestVersion here?

Wanted to extend my comment. Are we saying that ChangeFeedEstimatorIterator is only used in LastestVersion and never AllVersionsAndDeletes?

Well, I used that as the default because that was how it was used before AVAD was added and I didn't want to break the API or the contract of a public API. Adding a new public API that adds a mode parameter makes sense to me.

Change Feed Estimator uses the LSN from the response to calculate the estimated delta. Do we need AllVersionsAndDelete mode? Or does the LatestVersion mode provide the same output? The math is taking the responses' SessionToken minus the first item's LSN:

azure-cosmos-dotnet-v3/Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedEstimatorIterator.cs

Lines 286 to 290 in 7ed22ac

long parsedLSNFromSessionToken = ChangeFeedEstimatorIterator.TryConvertToNumber(ExtractLsnFromSessionToken(response.Headers.Session));

IEnumerable<JObject> items = ChangeFeedEstimatorIterator.GetItemsFromResponse(response);

long lastQueryLSN = items.Any()

? ChangeFeedEstimatorIterator.TryConvertToNumber(ChangeFeedEstimatorIterator.GetFirstItemLSN(items)) - 1

: parsedLSNFromSessionToken;

If this requires AllVersionsAndDeletes to be set, then (and I would probably suggest doing it as a separate PR), maybe the solution is to store which mode the processor was run in on the .info document and use that to define the mode of the Estimator (to avoid 2 Estimator APIs)

After syncing with @jcocchi, using LatestVersion for the Estimator is ok

After syncing with @jcocchi, using LatestVersion for the Estimator is ok

@ealsur or @jcocchi, just for clarification and from a use case perspective, why do we NOT want to support AllVersionsAndDeletes for ChangeFeedEstimatorIterator?

@philipthomas-MSFT change feed estimator looks at the lag based on the current leases, calculating the lag is independent of change feed mode. The existing estimator works for both modes by design

philipthomas-MSFT · 2023-10-03T17:35:25Z

Microsoft.Azure.Cosmos/src/Resource/Container/ContainerCore.Items.cs

@@ -597,7 +598,34 @@ internal abstract partial class ContainerCore : ContainerInternal
            ChangeFeedObserverFactory observerFactory = new CheckpointerObserverFactory(
                new ChangeFeedObserverFactoryCore<T>(onChangesDelegate, this.ClientContext.SerializerCore),
                withManualCheckpointing: false);
-            return this.GetChangeFeedProcessorBuilderPrivate(processorName, observerFactory);
+            return this.GetChangeFeedProcessorBuilderPrivate(processorName,
+                observerFactory, ChangeFeedMode.Incremental);


Another decision to default this to Incremental? Why not LatestVersion?

philipthomas-MSFT · 2023-10-03T17:37:20Z

Microsoft.Azure.Cosmos/src/Resource/Container/ContainerCore.Items.cs

@@ -617,7 +645,8 @@ internal abstract partial class ContainerCore : ContainerInternal
            ChangeFeedObserverFactory observerFactory = new CheckpointerObserverFactory(
                new ChangeFeedObserverFactoryCore<T>(onChangesDelegate, this.ClientContext.SerializerCore),
                withManualCheckpointing: true);
-            return this.GetChangeFeedProcessorBuilderPrivate(processorName, observerFactory);
+            return this.GetChangeFeedProcessorBuilderPrivate(processorName,
+                observerFactory, ChangeFeedMode.Incremental);


Why Incremental and not LatestVersion?

philipthomas-MSFT · 2023-10-03T17:38:04Z

Microsoft.Azure.Cosmos/src/Resource/Container/ContainerCore.Items.cs

@@ -637,7 +666,8 @@ internal abstract partial class ContainerCore : ContainerInternal
            ChangeFeedObserverFactory observerFactory = new CheckpointerObserverFactory(
                new ChangeFeedObserverFactoryCore(onChangesDelegate),
                withManualCheckpointing: false);
-            return this.GetChangeFeedProcessorBuilderPrivate(processorName, observerFactory);
+            return this.GetChangeFeedProcessorBuilderPrivate(processorName,
+                observerFactory, ChangeFeedMode.Incremental);


Why Incremental and not LatestVersion?

philipthomas-MSFT · 2023-10-03T17:38:12Z

Microsoft.Azure.Cosmos/src/Resource/Container/ContainerCore.Items.cs

-            return this.GetChangeFeedProcessorBuilderPrivate(processorName, observerFactory);
+            return this.GetChangeFeedProcessorBuilderPrivate(processorName,
+                observerFactory,
+                ChangeFeedMode.Incremental);


Why Incremental and not LatestVersion?

Because I wasn't sure which was the new version and which was the old. I'll switch them all to LatestVersion

philipthomas-MSFT · 2023-10-03T17:46:58Z

Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/ChangeFeed/DynamicTests.cs

@@ -80,6 +83,94 @@ public async Task TestWithRunningProcessor()
            Assert.AreEqual("0.1.2.3.4.5.6.7.8.9.", accumulator);
        }

+        [TestMethod]
+        public async Task TestWithRunningFFCFProcessor()


It is a bit difficult to follow what this test is actually testing for? Maybe too much in one test? Maybe one test can create docs, then verify docs created. Maybe another test to created docs, then updated, then verify docs updated. Maybe another test and verify deletes. Maybe another tests that is past retention and should have no documents.

philipthomas-MSFT · 2023-10-03T17:50:11Z

.../Microsoft.Azure.Cosmos.Tests/ChangeFeed/ChangeFeedPartitionKeyResultSetIteratorCoreTests.cs

@@ -78,6 +78,7 @@ public async Task EtagPassesContinuation()

            ChangeFeedPartitionKeyResultSetIteratorCore iterator = ChangeFeedPartitionKeyResultSetIteratorCore.Create(
                lease: documentServiceLeaseCore,
+                mode: ChangeFeedMode.Incremental,


This goes for all of the tests for Incremental, LatestVersion is going to be replacing this so we need to figure out when we want to transition. We can't get rid of Incremental until a major release version change, but we are exposing LatestVersion and giving cx access.

Can the old names, i.e. Incremental etc not be marked BrowserVisible.Never ? Having a noisy set of identifiers in intellisense is a horrible experience - even if obsoletion notes in the xmldoc could temper it a little.

Also I think marking them Obsolete would be for the best

it's not going to inconvenience a lot of people

it would flush out all usages flagged in the PR reviews here (and the tests that need to cover them can inhibit the warnings)

Marking Obsolete(which I'd love to) might break a build, which for many customers, is a no-no and considered a breaking change

That's why obsoletion is by default only a warning for C# and F# :P But, fair enough.

IMO hiding it via BrowserVisible is the right thing to do there - the Intellisense experience will be far less noisy.

Yeah, but it is common for users to have TreatWarningsAsErrors and that breaks a build :(

I agree that hiding it would be great from Intellisense

[EditorBrowsable(EditorBrowsableState.Never)] would be the right decorator.

Yeah, but it is common for users to have TreatWarningsAsErrors and that breaks a build

I get that, and I've already accepted that it's something that's reasonable to make a subjective call on, for better or for worse.

But now we're still talking, some more devil's advocate points for Obsolete:

people with TWAE are adults that have opted into something

using a barely out of preview feature is absolutely the definition of a non-mainline scenario

they will thank you as a pile of docs are about to make the old names look very stupid

FCCF is not a mainline scenario

I don't think it's actually written anywhere that obsoleting something is as cheeky as a breaking change?

The fact that this repo is working on an evergreen basis without any obsoletions in site is another to consider bending the rule in this instance

Having said all of that, hiding it with BrowserVisible is a fine solution for me in terms of the actual impact on real humans.

jcocchi · 2023-10-04T00:01:08Z

@iainx can you please add a simple usage example to the description so it's clear how customers would use the new APIs?

+1

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedEstimatorIterator.cs

ealsur · 2023-10-05T15:19:06Z

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedProcessorCore.cs

        {
            this.observerFactory = observerFactory ?? throw new ArgumentNullException(nameof(observerFactory));
+            this.mode = mode;


Why not add the mode to the ChangeFeedProcessorOptions that is already passed down?

ealsur · 2023-10-05T15:23:46Z

Microsoft.Azure.Cosmos/src/ChangeFeed/ChangeFeedPartitionKeyResultSetIteratorCore.cs

-                    requestMessage.Headers.Add(
-                        HttpConstants.HttpHeaders.A_IM,
-                        HttpConstants.A_IMHeaderValues.IncrementalFeed);
+                    // Add the necessary mode headers


At some point during the CFP initialization, a .info file is created. Should we store the mode there? Also, what happens if a customer starts a normal (Incremental) CFP and then changes to an AllVersions one with the same leases (same LSNs)? Should we allow that? If not, this .info file can be used to check the mode and throw if it doesn't match? Thoughts @jcocchi ?

Adding the mode on the .info file is a good idea. In Java they added the mode as part of the continuation token for each lease.

I was under the impression that reusing leases across modes wasn't supported for technical reasons (though customers have already asked how they can use latest version until they "catch up" to all versions and deletes then switch over). Supporting lease compatibility is a good future goal but not current requirement.

.info or in the Leases, both solutions work, yeah. As long as we save it to use it, for example, in the Estimator or to validate if the leases were created with one mode and now attempted to be used with another.

We need to confirm if Java SDK errors out if you attempt to use leases from one mode and then switch the Processor to use another. For consistency, we should either error out or not. If we need to error out, we need to store the mode somewhere to compare the current mode vs. what was stored in .info or the leases (wherever we want to store the mode)

Confirming this with Java team.

iainx · 2023-10-11T10:38:12Z

@iainx can you please add a simple usage example to the description so it's clear how customers would use the new APIs?

+1

Done. It was initially in the API discussion thread, but I've moved it to here

philipthomas-MSFT · 2024-01-17T16:11:56Z

Microsoft.Azure.Cosmos.Encryption/src/EncryptionContainer.cs

@@ -592,6 +592,51 @@ internal sealed class EncryptionContainer : Container
                });
        }

+#if SDKPROJECTREF
+        public override ChangeFeedProcessorBuilder GetAllVersionsChangeFeedProcessorBuilder<T>(


Where are the unit or integration tests for GetAllVersionsChangeFeedProcessorBuilder<T>?

philipthomas-MSFT · 2024-01-17T16:12:22Z

Microsoft.Azure.Cosmos.Encryption/src/EncryptionContainer.cs

@@ -592,6 +592,51 @@ internal sealed class EncryptionContainer : Container
                });
        }

+#if SDKPROJECTREF


What is the significance of SDKPROJECTREF for this block of code?

philipthomas-MSFT · 2024-01-17T17:40:33Z

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedEstimatorIterator.cs

@@ -54,6 +54,7 @@ internal sealed class ChangeFeedEstimatorIterator : FeedIterator<ChangeFeedProce
                  changeFeedEstimatorRequestOptions,
                  (DocumentServiceLease lease, string continuationToken, bool startFromBeginning) => ChangeFeedPartitionKeyResultSetIteratorCore.Create(
                          lease: lease,
+                          mode: ChangeFeedMode.LatestVersion,


After syncing with @jcocchi, using LatestVersion for the Estimator is ok

@ealsur or @jcocchi, just for clarification and from a use case perspective, why do we NOT want to support AllVersionsAndDeletes for ChangeFeedEstimatorIterator?

philipthomas-MSFT · 2024-01-17T17:43:42Z

Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedProcessorBuilder.cs

@@ -69,6 +69,17 @@ public ChangeFeedProcessorBuilder WithInstanceName(string instanceName)
            return this;
        }

+        /// <summary>
+        /// Sets the mode for the change freed processor.


Spelling correction "feed".

philipthomas-MSFT · 2024-01-24T13:11:53Z

Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/ChangeFeed/DynamicTests.cs

-                new ContainerProperties(id: Guid.NewGuid().ToString(), partitionKeyPath: PartitionKey),
+            ContainerProperties properties = new ContainerProperties(id: Guid.NewGuid().ToString(), 
+                partitionKeyPath: PartitionKey);
+            properties.ChangeFeedPolicy.FullFidelityRetention = TimeSpan.FromMinutes(5);


Need to change. No need to set retention for non-AllVersionsAndDeletes tests.

philipthomas-MSFT · 2024-02-13T15:24:13Z

replaced by another PR that is already closed.

iainx requested review from khdang, sboshra, adityasa, neildsh, kirankumarkolli, ealsur, FabianMeiswinkel and kirillg as code owners July 24, 2023 15:10

iainx marked this pull request as draft July 24, 2023 15:10

FFCF wip

9572286

iainx mentioned this pull request Jul 25, 2023

FFCF API discussion #4007

Closed

jcocchi reviewed Jul 26, 2023

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Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/Observers/ChangeFeedObserverFactoryCore.cs Outdated Show resolved Hide resolved

jcocchi reviewed Jul 26, 2023

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iain holmes added 2 commits July 27, 2023 14:19

Use ChangeFeedItemChange instead of creating an identical class

32aba69

Update tests for FFCF

5ee5894

iainx marked this pull request as ready for review September 11, 2023 09:50

iain added 11 commits September 11, 2023 10:50

Merge branch 'master' into dev/iainx/alldelete-wip

5ccd13e

Fix the ambiguity when using a dynamic type

0c06012

Merge branch 'dev/iainx/alldelete-wip' of github.com:iainx/azure-cosm…

8b5020b

…os-dotnet-v3 into dev/iainx/alldelete-wip

Bump the CosmosDB version

8c76927

Bump CosmosDB versions

1cd72ce

Forgot to make the override public

adb2ef1

Put GetAllVersionsChangeFeed override behind SDKPROJECTREF

022d9b9

Merge branch 'master' into dev/iainx/alldelete-wip

68fa4a4

Update the public API contract

44f85a1

Merge branch 'master' into dev/iainx/alldelete-wip

319fa87

philipthomas-MSFT reviewed Oct 3, 2023

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ealsur reviewed Oct 5, 2023

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Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/ChangeFeedEstimatorIterator.cs Show resolved Hide resolved

ealsur reviewed Oct 5, 2023

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iain added 4 commits October 11, 2023 11:38

Merge branch 'master' into dev/iainx/alldelete-wip

8b72ae7

Rename GetAllVersionChangeFeedProcessorBuilder

2b4a451

Use LatestVersion instead of Incremental

e2907f1

Move the changefeed mode into the ChangeFeedProcessorOptions

f93aad1

iainx requested a review from a team as a code owner November 1, 2023 13:20

iain holmes added 3 commits November 6, 2023 12:15

Rewrite FFCF the tests

dc4c330

Update for new API

5fca4fa

Split the one ig test into 3 little ones

d13fc70

philipthomas-MSFT self-assigned this Jan 16, 2024

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microsoft-github-policy-service bot enabled auto-merge (squash) January 16, 2024 15:41

philipthomas-MSFT marked this pull request as draft January 16, 2024 15:41

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merge from remote master

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philipthomas-MSFT reviewed Jan 17, 2024

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fixed Delete to Deletes

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philipthomas-MSFT mentioned this pull request Jan 18, 2024

[Internal] Change Feed Processor: Adds AllVersionsAndDeletes support #4264

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philipthomas-MSFT closed this Feb 13, 2024

	long parsedLSNFromSessionToken = ChangeFeedEstimatorIterator.TryConvertToNumber(ExtractLsnFromSessionToken(response.Headers.Session));
	IEnumerable<JObject> items = ChangeFeedEstimatorIterator.GetItemsFromResponse(response);
	long lastQueryLSN = items.Any()
	? ChangeFeedEstimatorIterator.TryConvertToNumber(ChangeFeedEstimatorIterator.GetFirstItemLSN(items)) - 1
	: parsedLSNFromSessionToken;

[Internal] FFCF: Initial PR for AllVersionsAndDeletes #4003

[Internal] FFCF: Initial PR for AllVersionsAndDeletes #4003

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iainx commented Jul 24, 2023 • edited Loading

Description

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jcocchi commented Oct 4, 2023 • edited by philipthomas-MSFT Loading

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iainx commented Oct 11, 2023

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philipthomas-MSFT commented Feb 13, 2024

iainx commented Jul 24, 2023 •

edited

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jcocchi commented Oct 4, 2023 •

edited by philipthomas-MSFT

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philipthomas-MSFT Jan 17, 2024 •

edited

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