Dynamic enablement of Per-Partition Automatic Failover #46477

jeet1995 · 2025-08-21T23:41:11Z

Description

This pull request introduces a way to dynamically allow a Cosmos(Async)Client to be per-partition automatic failover capable when the service is per-partition automatic failover capable without the requirement of app-side client restarts.

Approach taken

A callback is passed from RxDocumentClientImpl, which is responsible for:

Setting the opt-in flags on:
- GlobalPartitionEndpointManagerForPerPartitionCircuitBreaker
- GlobalPartitionEndpointManagerForPerPartitionAutomaticFailover
Adding the user agent suffix
Determining whether the cross-region availability strategy should be enabled for non-write operations

Invocation Context

This callback is invoked within GlobalEndpointManager, which:

Makes calls to the Gateway to retrieve the DatabaseAccount payload
Monitors for changes in the enablePerPartitionFailoverBehavior boolean flag

Behavior on Change

If a change in enablePerPartitionFailoverBehavior is detected:

The client-side opt-in for failover strategies is updated accordingly. If the transition is from true to false, both PPAF and PPCB are disabled, and any cached failover information is cleared. Cross region availability strategy is disabled.

Other changes

PPAF-enforced hedging is wired for the QueryPlan calls.

Testing done

Relevant Integration Tests

PerPartitionAutomaticFailoverE2ETests#testPpafWithWriteFailoverWithEligibleErrorStatusCodesWithPpafDynamicEnablement
PerPartitionAutomaticFailoverE2ETests#testFailoverBehaviorForNonWriteOperationsWithPpafDynamicEnablement

Summary

Both tests validate the following:

Initial State:
Failover does not occur when enablePerPartitionFailoverBehavior is reported as false.
Dynamic Enablement:
Without restarting or reinitializing the CosmosAsyncClient instance, a DatabaseAccount refresh is triggered.
Post-Refresh Behavior:
After the refresh, enablePerPartitionFailoverBehavior is reported as true.
At this point:
- Failover behavior for writes and reads is validated.
- Hedging behavior for reads is also validated.

Relevant end-to-end tests done

A workload (Query, Read and Create) was run against a non-PPAF enabled account. At roughly 18:21 EST, a complete quorum loss was triggered in North Central US. Post this, the account was enabled with PPAF (at roughly 18:28 was when the CosmosClient instance got the DatabaseAccount payload with enablePerPartitionFailoverBehavior set to true.

2025-09-21 18:28:16 INFO  ClientRetryPolicy:423 - shouldRetryOnServiceUnavailable() Retrying. Received on endpoint https://northcentralus.documents-test.windows-int.net:443/, IsReadRequest = true
2025-09-21 18:28:16 INFO  WorkloadUtils:640 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:16.368229700Z, operationType=query, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=1082, failureCountUntilNow=106, threadId=2, statusCode=200, subStatusCode=0, commaSeparatedContactedRegions=north central us,west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H50M0.6616921S, latestRecordedSessionToken=null]
2025-09-21 18:28:16 WARN  GlobalEndpointManager:377 - Per partition automatic failover enabled: true, applying modifier
2025-09-21 18:28:16 WARN  RxDocumentClientImpl:7902 - Per-Partition Circuit Breaker is enabled because Per-Partition Automatic Failover is enabled.
2025-09-21 18:28:16 WARN  RxDocumentClientImpl:7439 - As Per-Partition Automatic Failover (PPAF) is enabled a default End-to-End Operation Latency Policy will be applied for read, query, readAll and readyMany operation types.
2025-09-21 18:28:16 WARN  RxDocumentClientImpl:7920 - Per-Partition Automatic Failover (PPAF) enforced E2E Latency Policy for reads is enabled.
2025-09-21 18:28:16 INFO  GlobalEndpointManager:342 - db account retrieved {"_self":"","id":"abhm-test14-strong-3r-01","_rid":"abhm-test14-strong-3r-01.documents-test.windows-int.net","media":"//media/","addresses":"//addresses/","_dbs":"//dbs/","writableLocations":[{"name":"North Central US","databaseAccountEndpoint":"https://.documents-test.windows-int.net:443/"}],"readableLocations":[{"name":"North Central US","databaseAccountEndpoint":"https://abhm-test14-strong-3r-01-northcentralus.documents-test.windows-int.net:443/"},{"name":"West US","databaseAccountEndpoint":"https://.documents-test.windows-int.net:443/"},{"name":"East Asia","databaseAccountEndpoint":"https://abhm-test14-strong-3r-01-eastasia.documents-test.windows-int.net:443/"}],"enableMultipleWriteLocations":false,"continuousBackupEnabled":true,"enableNRegionSynchronousCommit":false,"enablePerPartitionFailoverBehavior":true,"userReplicationPolicy":{"asyncReplication":false,"minReplicaSetSize":2,"maxReplicasetSize":4},"userConsistencyPolicy":{"defaultConsistencyLevel":"Strong"},"systemReplicationPolicy":{"minReplicaSetSize":3,"maxReplicasetSize":4},"readPolicy":{"primaryReadCoefficient":1,"secondaryReadCoefficient":1},"queryEngineConfiguration":"{\"allowNewKeywords\":true,\"maxJoinsPerSqlQuery\":10,\"maxQueryRequestTimeoutFraction\":0.9,\"maxSqlQueryInputLength\":524288,\"maxUdfRefPerSqlQuery\":10,\"queryMaxInMemorySortDocumentCount\":-1000,\"spatialMaxGeometryPointCount\":256,\"sqlAllowNonFiniteNumbers\":false,\"sqlDisableOptimizationFlags\":0,\"sqlQueryILDisableOptimizationFlags\":0,\"clientDisableOptimisticDirectExecution\":false,\"queryEnableFullText\":true,\"queryEnableFullTextPreviewFeatures\":false,\"queryMaxFullTextScoreSearchTerms\":5,\"queryMaxRrfArgumentCount\":100,\"enableSpatialIndexing\":true,\"maxInExpressionItemsCount\":2147483647,\"maxLogicalAndPerSqlQuery\":2147483647,\"maxLogicalOrPerSqlQuery\":2147483647,\"maxSpatialQueryCells\":2147483647,\"sqlAllowAggregateFunctions\":true,\"sqlAllowGroupByClause\":true,\"sqlAllowLike\":true,\"sqlAllowSubQuery\":true,\"sqlAllowScalarSubQuery\":true,\"sqlAllowTop\":true}"}

Recovery logs through PPAF and PPCB

2025-09-21 18:28:19 INFO  WorkloadUtils:391 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:19.646311500Z, operationType=read, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=1282, failureCountUntilNow=99, threadId=1, statusCode=200, subStatusCode=0, commaSeparatedContactedRegions=west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://a.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M57.3836103S, latestRecordedSessionToken=null]
2025-09-21 18:28:19 INFO  WorkloadUtils:146 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:19.723726700Z, operationType=create, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=361, failureCountUntilNow=1093, threadId=0, statusCode=201, subStatusCode=0, commaSeparatedContactedRegions=west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M57.3061951S, latestRecordedSessionToken=null]
2025-09-21 18:28:19 INFO  WorkloadUtils:146 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:19.723726700Z, operationType=create, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=359, failureCountUntilNow=1093, threadId=6, statusCode=201, subStatusCode=0, commaSeparatedContactedRegions=west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M57.3061951S, latestRecordedSessionToken=null]
2025-09-21 18:28:19 INFO  WorkloadUtils:391 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:19.723726700Z, operationType=read, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=1283, failureCountUntilNow=99, threadId=4, statusCode=200, subStatusCode=0, commaSeparatedContactedRegions=west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M57.3061951S, latestRecordedSessionToken=null]
2025-09-21 18:28:19 INFO  WorkloadUtils:146 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:19.723726700Z, operationType=create, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=360, failureCountUntilNow=1093, threadId=3, statusCode=201, subStatusCode=0, commaSeparatedContactedRegions=west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M57.3061951S, latestRecordedSessionToken=null]
2025-09-21 18:28:19 INFO  WorkloadUtils:640 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:19.793743600Z, operationType=query, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=1088, failureCountUntilNow=106, threadId=5, statusCode=200, subStatusCode=0, commaSeparatedContactedRegions=north central us,west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://abhm-test14-strong-3r-01.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M57.2361782S, latestRecordedSessionToken=null]
2025-09-21 18:28:19 INFO  WorkloadUtils:640 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:19.954611700Z, operationType=query, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=1089, failureCountUntilNow=106, threadId=2, statusCode=200, subStatusCode=0, commaSeparatedContactedRegions=east asia,north central us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://abhm-test14-strong-3r-01.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M57.0753101S, latestRecordedSessionToken=null]
2025-09-21 18:28:20 INFO  WorkloadUtils:640 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:20.107600900Z, operationType=query, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=1090, failureCountUntilNow=106, threadId=2, statusCode=200, subStatusCode=0, commaSeparatedContactedRegions=north central us,west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M56.9223209S, latestRecordedSessionToken=null]
2025-09-21 18:28:20 INFO  WorkloadUtils:391 - RequestResponseInfo [timeOfResponse=2025-09-21T22:28:20.435655100Z, operationType=read, drillId=ppaf-dynamic-enablement-test, successCountUntilNow=1284, failureCountUntilNow=99, threadId=7, statusCode=200, subStatusCode=0, commaSeparatedContactedRegions=west us, cosmosDiagnosticsContext=, errorMessage=, connectionModeAsStr=DIRECT, containerName=TestContainer, accountName=https://.documents-test.windows-int.net:443/, possiblyColdStartClient=false, databaseName=TestDatabase, runTimeRemaining=PT1H49M56.5942667S, latestRecordedSessionToken=null]

Failover transition example

All SDK Contribution checklist:

The pull request does not introduce [breaking changes]
CHANGELOG is updated for new features, bug fixes or other significant changes.
I have read the contribution guidelines.

General Guidelines and Best Practices

Title of the pull request is clear and informative.
There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

Pull request includes test coverage for the included changes.

…dified.

…afDynamicEnablement # Conflicts: # sdk/cosmos/azure-cosmos-tests/src/test/java/com/azure/cosmos/PerPartitionAutomaticFailoverE2ETests.java # sdk/cosmos/azure-cosmos/CHANGELOG.md

jeet1995 · 2025-09-08T15:33:26Z

/azp run java - cosmos - tests

azure-pipelines · 2025-09-08T15:33:54Z

Azure Pipelines successfully started running 1 pipeline(s).

…afDynamicEnablement

Copilot

Pull Request Overview

This PR implements dynamic enablement of Per-Partition Automatic Failover (PPAF) in the Azure Cosmos DB Java SDK. The key enhancement allows PPAF to be enabled/disabled at runtime based on service-side configuration, moving away from static client-side configuration.

Key changes include:

Enhanced GlobalEndpointManager to monitor and respond to database account configuration changes
Added dynamic PPAF configuration capability through a callback mechanism
Extended user agent feature flags to include ThinClient and Http2 support
Improved thread safety in UserAgentContainer with read-write locks

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
`GlobalPartitionEndpointManagerForPerPartitionCircuitBreaker.java`	Added clear() method and synchronized resetCircuitBreakerConfig
`GlobalPartitionEndpointManagerForPerPartitionAutomaticFailover.java`	Added synchronized resetPerPartitionAutomaticFailoverEnabled with state clearing
`UserAgentFeatureFlags.java`	Added ThinClient and Http2 feature flags
`UserAgentContainer.java`	Enhanced thread safety with read-write locks and improved flag handling
`RxGatewayStoreModel.java`	Added gateway response recording for cancelled requests
`RxDocumentClientImpl.java`	Refactored PPAF initialization to support dynamic enablement
`GlobalEndpointManager.java`	Added dynamic PPAF monitoring and callback mechanism
`DiagnosticsClientContext.java`	Updated diagnostics to track dynamic PPAF state
`ReflectionUtils.java`	Added reflection utilities for testing GlobalEndpointManager owner
`PerPartitionAutomaticFailoverE2ETests.java`	Added comprehensive end-to-end tests for dynamic PPAF enablement

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/UserAgentContainer.java

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/RxDocumentClientImpl.java

...cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/GlobalEndpointManager.java

...azure-cosmos-tests/src/test/java/com/azure/cosmos/PerPartitionAutomaticFailoverE2ETests.java

…afDynamicEnablement

jeet1995 · 2025-09-09T02:21:33Z

/azp run java - cosmos - tests

azure-pipelines · 2025-09-09T02:21:55Z

Azure Pipelines successfully started running 1 pipeline(s).

…afDynamicEnablement

jeet1995 · 2025-09-11T19:22:03Z

/azp run java - cosmos - tests

azure-pipelines · 2025-09-11T19:22:32Z

Azure Pipelines successfully started running 1 pipeline(s).

jeet1995 · 2025-09-11T21:28:56Z

/azp run java - cosmos - tests

jeet1995 · 2025-09-22T15:49:43Z

/azp run java - cosmos - tests

jeet1995 · 2025-09-22T15:49:54Z

/azp run java - cosmos - spark

azure-pipelines · 2025-09-22T15:50:03Z

Azure Pipelines successfully started running 1 pipeline(s).

jeet1995 · 2025-09-22T15:50:06Z

/azp run java - cosmos - kafka

azure-pipelines · 2025-09-22T15:50:16Z

Azure Pipelines successfully started running 1 pipeline(s).

azure-pipelines · 2025-09-22T15:50:18Z

Azure Pipelines successfully started running 1 pipeline(s).

FabianMeiswinkel · 2025-09-22T16:20:12Z

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/RxDocumentClientImpl.java


-            logger.warn("Availability strategy for reads, queries, read all and read many" +
-                " is enabled when PerPartitionAutomaticFailover is enabled.");
+            logger.warn("As Per-Partition Automatic Failover (PPAF) is enabled a default End-to-End Operation Latency Policy will be applied for read, query, readAll and readyMany operation types.");


does this really have to be in warn-level (I know it was before - just asking)?

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/RxDocumentClientImpl.java

FabianMeiswinkel

LGTM excdept for the log-level comments.

jeet1995 · 2025-09-22T21:50:53Z

/azp run java - cosmos - tests

azure-pipelines · 2025-09-22T21:51:16Z

Azure Pipelines successfully started running 1 pipeline(s).

jeet1995 · 2025-09-23T03:45:30Z

/azp run java - cosmos - tests

azure-pipelines · 2025-09-23T03:45:57Z

Azure Pipelines successfully started running 1 pipeline(s).

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/RxDocumentClientImpl.java

xinlian12 · 2025-09-23T17:01:49Z

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/RxDocumentClientImpl.java

+        }
+
+        if (!Configs.isHttp2Enabled()) {
+            userAgentFeatureFlags.remove(UserAgentFeatureFlags.Http2);


should we only remove the http2 flag if both conditions match:

!Configs.ishttp2Enabled

!Http2ConnectionConfig.isEnabled

@xinlian12 We have two independent paths to HTTP/2 enablement. I've made it more explicit - could you take another look?

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/RxDocumentClientImpl.java

...cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/GlobalEndpointManager.java

...mos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/DiagnosticsClientContext.java

sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/RxDocumentClientImpl.java

.../perPartitionCircuitBreaker/GlobalPartitionEndpointManagerForPerPartitionCircuitBreaker.java

xinlian12

LGTM, thanks

…afDynamicEnablement # Conflicts: # sdk/cosmos/azure-cosmos/CHANGELOG.md

jeet1995 · 2025-10-01T02:25:43Z

/azp run java - cosmos - tests

azure-pipelines · 2025-10-01T02:26:10Z

Azure Pipelines successfully started running 1 pipeline(s).

jeet1995 added 4 commits August 21, 2025 12:32

Enabling PPAF dynamically.

907b003

Ensure atomicity when opt-ins for PPAF, PPCB and hedging are being mo…

88d24c0

…dified.

Ensure atomicity when opt-ins for PPAF, PPCB and hedging are being mo…

740cded

…dified.

Clear state (PPAF + PPCB) when PPAF config modifier callback is invoked.

ad1353b

github-actions bot added the Cosmos label Aug 21, 2025

jeet1995 added 7 commits September 3, 2025 11:40

Updated CHANGELOG.md

a033bc8

Updated CHANGELOG.md

8ffdd5f

Adding gateway response from non-responsive region in Gateway mode.

8126742

Fixing PerPartitionAutomaticFailoverE2ETests.

7db1c50

Fixing PerPartitionAutomaticFailoverE2ETests.

443de1f

Merge branch 'main' of github.com:jeet1995/azure-sdk-for-java into Pp…

7b499e2

…afDynamicEnablement # Conflicts: # sdk/cosmos/azure-cosmos-tests/src/test/java/com/azure/cosmos/PerPartitionAutomaticFailoverE2ETests.java # sdk/cosmos/azure-cosmos/CHANGELOG.md

Fixing PerPartitionAutomaticFailoverE2ETests.

b00a217

jeet1995 marked this pull request as ready for review September 8, 2025 17:10

Copilot AI review requested due to automatic review settings September 8, 2025 17:10

jeet1995 requested review from kirankumarkolli and a team as code owners September 8, 2025 17:10

Merge branch 'main' of github.com:jeet1995/azure-sdk-for-java into Pp…

7aec10e

…afDynamicEnablement

Copilot AI reviewed Sep 8, 2025

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Updated CHANGELOG.md

ee45562

jeet1995 changed the title ~~[No Review]: Dynamic enablement of Per-Partition Automatic Failover~~ Dynamic enablement of Per-Partition Automatic Failover Sep 8, 2025

Merge branch 'main' of github.com:jeet1995/azure-sdk-for-java into Pp…

6c6c4b7

…afDynamicEnablement

Merge branch 'main' of github.com:jeet1995/azure-sdk-for-java into Pp…

b00bfc4

…afDynamicEnablement

Attempt to fix diagnostics.

39da8a2

FabianMeiswinkel reviewed Sep 22, 2025

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Attempt to fix memory leak.

b066cf1

Attempt to fix memory leak.

29cbe77

xinlian12 reviewed Sep 23, 2025

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jeet1995 added 2 commits September 30, 2025 21:05

Addressing review comments.

f10e3d1

Merge branch 'main' of github.com:jeet1995/azure-sdk-for-java into Pp…

d7090ac

…afDynamicEnablement # Conflicts: # sdk/cosmos/azure-cosmos/CHANGELOG.md

Dynamic enablement of Per-Partition Automatic Failover #46477

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Description

Approach taken

Invocation Context

Behavior on Change

Other changes

Testing done

Relevant Integration Tests

Summary

Relevant end-to-end tests done

Failover transition example

All SDK Contribution checklist:

General Guidelines and Best Practices

Testing Guidelines

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Pull Request Overview

Reviewed Changes

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