HelixAdmin APIs and pipeline changes to support Helix Node Swap #2661

zpinto · 2023-10-17T18:43:05Z

Issues

HelixAdmin.setInstanceOperation and addInstance sanity checks for SWAP_IN & SWAP_OUT Helix Node/Instance Swap #2662
- Can only set instance to SWAP_OUT
- Can only add instance with the same logicaId as another if the already existing has InstanceOperation set to SWAP_OUT and there is not more than 1 already.
Create HelixAdmin.isSwapReadyToComplete and completeSwapIfReady(returns if swap finished) Helix Node/Instance Swap #2662
- completeSwapIfFinished will check if the swap is ready to complete. If ready, mark the SWAP_OUT instance as HELIX_ENABLED: false and clear the INSTANCE_OPERATION for SWAP_IN node.
Change WAGED assignment tie breaker logic to use logicalId when present Helix Node/Instance Swap #2662
- May want to make this configurable, as it will lead to shuffling when this change is deployed
Refactor DelayedAutoRebalancerUtil and DelayedAutoRebalancer.computeBestPossibleStateForPartition
to filter out SWAP_IN node because we will add SWAP_IN node to the end of preference list in computeBestPossibleStateForPartition until the swap is complete Helix Node/Instance Swap #2662
- Adding it to the end of the preference list will ensure that the SWAP_IN node only carries secondary states
- When SWAP_IN node has identical Current State to SWAP_OUT, isSwapFinished completeSwapIfFinished will return true

Description

Adding Helix Admin APIs and updating existing setInstanceOperation and addInstance implementations to support Helix Node Swap.

setInstanceOperation: Add sanity check to disallow setting the INSTANCE_OPERATION to SWAP_IN, as this should be set when we addInstance to cluster. We can't have a case where where there are two instances in the cluster with the same logicalId unless there is exactly 1 with SWAP_OUT and 1 with SWAP_IN INSTANCE_OPERATION.
addInstance: We now check to ensure that there is not already an instance in the cluster with the same logicalId. We only allow adding an instance with the same logicalId if the existing instance has SWAP_OUT INSTANCE_OPERATION or the add instance is being added in the disable state.
canSwapComplete: Checks if the swap of two instances is ready to mark completed. It takes either the SWAP_OUT or SWAP_IN instance as an argument. It does the following checks:
1. Both instances must be alive.
2. Both instances must only have one session and not be carrying over from a previous session.
3. Both instances must have no pending messages.
4. Both instances cannot have partitions in the ERROR state
5. SwapIn instance must have correct state for all partitions that are currently assigned to the SwapOut instance.
completeSwapPossible: Checks to see if the swap is ready to complete using isSwapReadyToComplete. If ready, it will clear the SwapIn node's INSTANCE_OPERATION and disable the SwapOut node.

Add ability for up to 2 nodes with the same logicalId to be added to the cluster at the same time when a SWAP is happening.
During all paritionAssignment for WAGED and DelayedAutoRebalancer, we select just one instance for each logicalId.

Cases:

If only one instance with logicalId, it passes through the filter
If two instances with logicalId, SWAP_OUT passes through the filter if the other node is SWAP_IN. If SWAP_IN node passes through the filter when the SWAP is marked complete by setting the InstanceOperation of the SWAP_IN node to null.

When SWAP_OUT nodes are the instances which pass through the filter and there are corresponding SWAP_IN nodes which are live and enabled, we add them to the end of all preference lists which contain the SWAP_OUT node following computeIdealState. This ensures that they are in secondTopState for all StateModels that can only have a single replica in the topState. For stateModels that allow multiple replicas of the topState, the SWAP_IN node could host topState replicas before the SWAP is completed.

Once the swap is complete and SWAP_IN node has InstanceOperation set to null, SWAP_IN node becomes assignable and WAGED and DelayedAutoRebalancer + CRUSHED will computePartitionAssignment and generate IdealState with SWAP_IN instance in same index of the preferenceList as the SWAP_OUT instance used to be in. This means that not only will SWAP_IN node have all the same partitions that the SWAP_OUT node had, but also the same states.

Tests

➜  helix git:(helix_node_swap_apis) ✗ mvn test -o -Dtest=TestInstanceOperation -pl=helix-core
[INFO] Scanning for projects...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for org.apache.helix:metrics-common:bundle:1.3.2-SNAPSHOT
[WARNING] 'build.pluginManagement.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-javadoc-plugin @ org.apache.helix:helix:1.3.2-SNAPSHOT, /Users/zapinto/Documents/git2/zpinto/helix/pom.xml, line 678, column 17
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for org.apache.helix:helix:pom:1.3.2-SNAPSHOT
[WARNING] 'build.pluginManagement.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-javadoc-plugin @ line 678, column 17
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 
[INFO] 
[INFO] --------------------< org.apache.helix:helix-core >---------------------
[INFO] Building Apache Helix :: Core 1.3.2-SNAPSHOT
[INFO]   from pom.xml
[INFO] -------------------------------[ bundle ]-------------------------------
[INFO] 
[INFO] --- enforcer:1.4.1:enforce (enforce-maven-version) @ helix-core ---
[INFO] 
[INFO] --- enforcer:1.4.1:enforce (enforce-java-version) @ helix-core ---
[INFO] 
[INFO] --- enforcer:1.4.1:enforce (enforce-output-timestamp-property) @ helix-core ---
[INFO] 
[INFO] --- jacoco:0.8.6:prepare-agent (default) @ helix-core ---
[INFO] argLine set to -javaagent:/Users/zapinto/.m2/repository/org/jacoco/org.jacoco.agent/0.8.6/org.jacoco.agent-0.8.6-runtime.jar=destfile=/Users/zapinto/Documents/git2/zpinto/helix/helix-core/target/jacoco.exec
[INFO] 
[INFO] --- remote-resources:1.7.0:process (process-resource-bundles) @ helix-core ---
[INFO] Preparing remote bundle org.apache:apache-jar-resource-bundle:1.4
[INFO] Copying 3 resources from 1 bundle.
[INFO] 
[INFO] --- resources:3.2.0:resources (default-resources) @ helix-core ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Using 'UTF-8' encoding to copy filtered properties files.
[INFO] Copying 4 resources
[INFO] Copying 0 resource
[INFO] Copying 3 resources
[INFO] The encoding used to copy filtered properties files have not been set. This means that the same encoding will be used to copy filtered properties files as when copying other filtered resources. This might not be what you want! Run your build with --debug to see which files might be affected. Read more at https://maven.apache.org/plugins/maven-resources-plugin/examples/filtering-properties-files.html
[INFO] 
[INFO] --- compiler:3.10.1:compile (default-compile) @ helix-core ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- bundle:5.1.4:manifest (bundle-manifest) @ helix-core ---
[WARNING] Manifest org.apache.helix:helix-core:bundle:1.3.2-SNAPSHOT : Unused Import-Package instructions: [org.apache.logging.log4j*, org.apache.logging.slf4j*] 
[INFO] Writing manifest: /Users/zapinto/Documents/git2/zpinto/helix/helix-core/target/classes/META-INF/MANIFEST.MF
[INFO] 
[INFO] --- resources:3.2.0:testResources (default-testResources) @ helix-core ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Using 'UTF-8' encoding to copy filtered properties files.
[INFO] Copying 15 resources
[INFO] Copying 3 resources
[INFO] 
[INFO] --- compiler:3.10.1:testCompile (default-testCompile) @ helix-core ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 498 source files to /Users/zapinto/Documents/git2/zpinto/helix/helix-core/target/test-classes
[INFO] /Users/zapinto/Documents/git2/zpinto/helix/helix-core/src/test/java/org/apache/helix/integration/TestCarryOverBadCurState.java: Some input files use or override a deprecated API.
[INFO] /Users/zapinto/Documents/git2/zpinto/helix/helix-core/src/test/java/org/apache/helix/integration/TestCarryOverBadCurState.java: Recompile with -Xlint:deprecation for details.
[INFO] /Users/zapinto/Documents/git2/zpinto/helix/helix-core/src/test/java/org/apache/helix/common/ZkTestBase.java: Some input files use unchecked or unsafe operations.
[INFO] /Users/zapinto/Documents/git2/zpinto/helix/helix-core/src/test/java/org/apache/helix/common/ZkTestBase.java: Recompile with -Xlint:unchecked for details.
[INFO] 
[INFO] --- surefire:3.0.0-M3:test (default-test) @ helix-core ---
[INFO] 
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.apache.helix.integration.rebalancer.TestInstanceOperation
Start zookeeper at localhost:2183 in thread main

...

START TestInstanceOperation.testAddingNodeWithSwapOutInstanceOperation() at Wed Nov 01 16:07:33 PDT 2023
START TestInstanceOperation.testAddingNodeWithSwapOutNodeInstanceOperationUnset() at Wed Nov 01 16:07:35 PDT 2023
START TestInstanceOperation.testNodeSwapWithNoSwapOutNode() at Wed Nov 01 16:07:37 PDT 2023
START TestInstanceOperation.testNodeSwapSwapInNodeNoInstanceOperationEnabled() at Wed Nov 01 16:07:39 PDT 2023
START TestInstanceOperation.testNodeSwapSwapInNodeWithAlreadySwappingPair() at Wed Nov 01 16:07:43 PDT 2023
START TestInstanceOperation.testNodeSwapNoTopologySetup() at Wed Nov 01 16:07:47 PDT 2023
START TestInstanceOperation.testNodeSwapWrongFaultZone() at Wed Nov 01 16:07:49 PDT 2023
START TestInstanceOperation.testNodeSwapWrongCapacity() at Wed Nov 01 16:07:55 PDT 2023
START TestInstanceOperation.testNodeSwap() at Wed Nov 01 16:07:57 PDT 2023
START TestInstanceOperation.testNodeSwapSwapInNodeNoInstanceOperationDisabled() at Wed Nov 01 16:08:05 PDT 2023
START TestInstanceOperation.testNodeSwapCancelSwapWhenReadyToComplete() at Wed Nov 01 16:08:15 PDT 2023
START TestInstanceOperation.testNodeSwapAfterEMM() at Wed Nov 01 16:08:26 PDT 2023
START TestInstanceOperation.testNodeSwapWithSwapOutInstanceDisabled() at Wed Nov 01 16:08:36 PDT 2023
START TestInstanceOperation.testNodeSwapAddSwapInFirstEnabledBeforeSwapOutSet() at Wed Nov 01 16:08:47 PDT 2023
START TestInstanceOperation.testNodeSwapAddSwapInFirstEnableBeforeSwapOutSet() at Wed Nov 01 16:08:50 PDT 2023
START TestInstanceOperation.testUnsetInstanceOperationOnSwapInWhenAlreadyUnsetOnSwapOut() at Wed Nov 01 16:08:55 PDT 2023
START TestInstanceOperation.testNodeSwapAddSwapInFirst() at Wed Nov 01 16:08:59 PDT 2023
AfterClass: TestInstanceOperation called.
Shut down zookeeper at port 2183 in thread main
[INFO] Tests run: 24, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 238.321 s - in org.apache.helix.integration.rebalancer.TestInstanceOperation
[INFO] 
[INFO] Results:
[INFO] 
[INFO] Tests run: 24, Failures: 0, Errors: 0, Skipped: 0
[INFO] 
[INFO] 
[INFO] --- jacoco:0.8.6:report (generate-code-coverage-report) @ helix-core ---
[INFO] Loading execution data file /Users/zapinto/Documents/git2/zpinto/helix/helix-core/target/jacoco.exec
[INFO] Analyzed bundle 'Apache Helix :: Core' with 947 classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  03:36 min
[INFO] Finished at: 2023-10-30T12:32:08-04:00
[INFO] ------------------------------------------------------------------------

Changes that Break Backward Compatibility (Optional)

We change the compareTo method in AssignableNode to use logicalId to make sure partitionAssignment will be the same after switching to SWAP_IN node. This is only used for tie breaking, so impact should not be large on already existing WAGED cluster assignment; however, it can cause some replica shuffling.

Documentation (Optional)

Commits

My commits all reference appropriate Apache Helix GitHub issues in their subject lines. In addition, my commits follow the guidelines from "How to write a good git commit message":
1. Subject is separated from body by a blank line
2. Subject is limited to 50 characters (not including Jira issue reference)
3. Subject does not end with a period
4. Subject uses the imperative mood ("add", not "adding")
5. Body wraps at 72 characters
6. Body explains "what" and "why", not "how"

Code Quality

My diff has been formatted using helix-style.xml
(helix-style-intellij.xml if IntelliJ IDE is used)

helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixAdmin.java

helix-core/src/main/java/org/apache/helix/HelixAdmin.java

helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixAdmin.java

New APIs: - isSwapReadyToComplete - completeSwapIfReady Updated APIs: - setInstanceOperation - addInstance (check to make sure no other instances with same logicalId unless old has SWAP_OUT and to add has SWAP_IN)

…following tests are not affected.

…and then used to remove duplicate logicalIds from enabledLiveNodes.

desaikomal

these are just my initial comments, i will do next pas soon..

desaikomal · 2023-10-26T15:07:09Z

helix-core/src/main/java/org/apache/helix/HelixAdmin.java

+   * swapIn instance can be passed in.
+   * @param clusterName  The cluster name
+   * @param instanceName The instance that is being swapped out or swapped in
+   * @return True if the swap is ready to be completed, false otherwise.


sorry for my lack of understanding, typically swap involves 2 entries, why does the API take only one? Also what does "swap" mean in this context?

unless instanceName is like "virtual" and there are 2 entities tied to the same virtual instance?

Instance name in this case will be one of the unique instance names(same as InstanceConfig znode ID) involved in the swap. Either SWAP_OUT or SWAP_IN. This API is intended to be used with the PerInstanceAccessor in helix-rest. For that endpoint you pass one instanceName.

Because we can find the matching swap instance for either SWAP_OUT or SWAP_IN node, we can take either as the instance name.

"swap" is referring to the operation between two instances which can be deduced from providing one of the instances involved in the swap.

...core/src/main/java/org/apache/helix/controller/dataproviders/BaseControllerDataProvider.java

helix-core/src/main/java/org/apache/helix/HelixAdmin.java

helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/PerInstanceAccessor.java

… fix AssignableNode to check for clusterTopologyConfig when attempting to get logicalId.

…join the cluster with an invalid DOMAIN field.

…ONE and matching INSTANCE_CAPACITY_MAP to SWAP_OUT node.

helix-core/src/main/java/org/apache/helix/controller/rebalancer/DelayedAutoRebalancer.java

xyuanlu · 2023-10-31T19:11:22Z

...core/src/main/java/org/apache/helix/controller/dataproviders/BaseControllerDataProvider.java

+   *
+   * @return a set of SWAP_IN instanceNames that have a corresponding SWAP_OUT instance.
+   */
+  public Set<String> getEnabledLiveSwapInInstanceNames() {


Question: when we tag SWAP_IN instanceNames, don't we already check if there is already an paring SWAP_OUT instance?

Discussed offline.

TLDR: Sanity checks ensure that we can't have a case where there are two instances with the same logicalId and both have InstanceOperation unset. This allows for setting either SWAP_OUT node or SWAP_IN node instance operation first.

xyuanlu · 2023-10-31T19:21:00Z

helix-core/src/main/java/org/apache/helix/controller/rebalancer/DelayedAutoRebalancer.java

@@ -113,9 +114,16 @@ public IdealState computeNewIdealState(String resourceName,
      allNodes = clusterData.getAllInstances();
    }

+    Set<String> allNodesDeduped = DelayedRebalanceUtil.filterOutInstancesWithDuplicateLogicalIds(


Do you think we could integrate the logic into getEnabledLiveInstances?
Probably with better name when we work on consolidating operation and disable/enable in one enum and we redesign all the getters.

Added a TODO for this. We can do it when we refactor to use states instead of InstanceOperation.

…ed state before SWAP_OUT node has instance operation set.

helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/PerInstanceAccessor.java

…mputed with logicalIds intead of instanceNames.

zpinto · 2023-11-03T21:49:42Z

CI failure is due to recurring flaky test testDistributedController #2498

This PR is ready to be merged.

Final Commit Message:

Add ability for up to 2 nodes with the same logicalId to be added to the cluster at the same time when a SWAP is happening.
During all paritionAssignment for WAGED and DelayedAutoRebalancer, we select just one instance for each logicalId. Achieves n -> n+1 for all replicas on SWAP_OUT node and back n when SWAP is marked complete, making it cancelable.

Adding and updating Helix Admin APIs to support swap operation:

setInstanceOperation
addInstance
canCompleteSwap
completeSwapIfPossible

Add ability for up to 2 nodes with the same logicalId to be added to the cluster at the same time when a SWAP is happening. During all paritionAssignment for WAGED and DelayedAutoRebalancer, we select just one instance for each logicalId. Achieves n -> n+1 for all replicas on SWAP_OUT node and back n when SWAP is marked complete, making it cancelable. Adding and updating Helix Admin APIs to support swap operation: setInstanceOperation addInstance canCompleteSwap completeSwapIfPossible * Refactor sanity checks for HelixAdmin swap APIs. * Helix Node Swap pipeline changes and integration tests. * Fix integration tests to properly restore stopped MockParticipant so following tests are not affected. * Add comments and docstrings. * Fix tests to clean up after themselves. * Optimize duplicate logicalId filtering to only be called on allNodes and then used to remove duplicate logicalIds from enabledLiveNodes. * Add handling for clusterConfig == null in updateSwappingInstances and fix AssignableNode to check for clusterTopologyConfig when attempting to get logicalId. * Fix integ tests. * Fix testGetDomainInformation since we no longer allow an instance to join the cluster with an invalid DOMAIN field. * Add checks to ensure that the SWAP_IN instance has a matching FAULT_ZONE and matching INSTANCE_CAPACITY_MAP to SWAP_OUT node. * Rename canSwapBeCompleted to canCompleteSwap. * Add sanity checks to allow SWAP_IN node to join the cluster in disabled state before SWAP_OUT node has instance operation set. * Fix print in test case. * Add canCompleteSwap to PerInstanceAccessor and fix formatting. * Fix flaky node swap after completion by making sure replica has is computed with logicalIds intead of instanceNames.

zpinto changed the title ~~APIs for Helix Node Swap~~ HelixAdmin APIs for Helix Node Swap Oct 17, 2023

asfgit force-pushed the ApplicationClusterManager branch from 7fca663 to 5f1a3f7 Compare October 17, 2023 20:25

zpinto force-pushed the helix_node_swap_apis branch from c16310f to 7063dec Compare October 17, 2023 20:56

zpinto marked this pull request as ready for review October 19, 2023 22:11

xyuanlu reviewed Oct 19, 2023

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helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixAdmin.java Show resolved Hide resolved

MarkGaox reviewed Oct 19, 2023

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helix-core/src/main/java/org/apache/helix/HelixAdmin.java Outdated Show resolved Hide resolved

helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixAdmin.java Outdated Show resolved Hide resolved

zpinto added 2 commits October 20, 2023 16:11

Add HelixAdmin APIs for Instance Swap.

6dc998d

New APIs: - isSwapReadyToComplete - completeSwapIfReady Updated APIs: - setInstanceOperation - addInstance (check to make sure no other instances with same logicalId unless old has SWAP_OUT and to add has SWAP_IN)

Fix typos and rename swap APIs.

ee03fd2

zpinto force-pushed the helix_node_swap_apis branch from 7063dec to ee03fd2 Compare October 20, 2023 20:24

xyuanlu approved these changes Oct 21, 2023

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zpinto added 5 commits October 25, 2023 13:51

Add integration tests.

8956ad6

Refactor sanity checks for HelixAdmin swap APIs.

fa7e067

Helix Node Swap pipeline changes and integration tests.

d2f72a4

Fix integration tests to properly restore stopped MockParticipant so …

a4be83d

…following tests are not affected.

Add comments and docstrings.

c42078f

zpinto changed the title ~~HelixAdmin APIs for Helix Node Swap~~ HelixAdmin APIs and pipeline changes to support Helix Node Swap Oct 26, 2023

github-actions bot added the CheckedAndApproved label Oct 26, 2023

zpinto added 2 commits October 25, 2023 23:20

Fix tests to clean up after themselves.

6d0a3f7

Optimize duplicate logicalId filtering to only be called on allNodes …

a6557cf

…and then used to remove duplicate logicalIds from enabledLiveNodes.

desaikomal reviewed Oct 26, 2023

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himanshukandwal reviewed Oct 26, 2023

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helix-core/src/main/java/org/apache/helix/HelixAdmin.java Outdated Show resolved Hide resolved

helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/PerInstanceAccessor.java Show resolved Hide resolved

zpinto added 5 commits October 26, 2023 23:53

Add handling for clusterConfig == null in updateSwappingInstances and…

d3887bd

… fix AssignableNode to check for clusterTopologyConfig when attempting to get logicalId.

Fix integ tests.

4ca8f26

Fix testGetDomainInformation since we no longer allow an instance to …

aa813a9

…join the cluster with an invalid DOMAIN field.

Add checks to ensure that the SWAP_IN instance has a matching FAULT_Z…

b9a3d8d

…ONE and matching INSTANCE_CAPACITY_MAP to SWAP_OUT node.

Rename canSwapBeCompleted to canCompleteSwap.

4d31725

xyuanlu reviewed Oct 31, 2023

View reviewed changes

zpinto added 2 commits November 1, 2023 16:03

Add sanity checks to allow SWAP_IN node to join the cluster in disabl…

476e1fb

…ed state before SWAP_OUT node has instance operation set.

Fix print in test case.

ddd6c16

xyuanlu reviewed Nov 3, 2023

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helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/PerInstanceAccessor.java Show resolved Hide resolved

zpinto added 2 commits November 2, 2023 18:23

Add canCompleteSwap to PerInstanceAccessor and fix formatting.

363a61a

Fix flaky node swap after completion by making sure replica has is co…

853b15d

…mputed with logicalIds intead of instanceNames.

xyuanlu approved these changes Nov 3, 2023

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xyuanlu merged commit 7613cab into apache:ApplicationClusterManager Nov 3, 2023
1 of 2 checks passed

xyuanlu mentioned this pull request Dec 18, 2023

Merge feature branch - Application cluster manager #2714

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HelixAdmin APIs and pipeline changes to support Helix Node Swap #2661

HelixAdmin APIs and pipeline changes to support Helix Node Swap #2661

zpinto commented Oct 17, 2023 •

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zpinto commented Nov 3, 2023

HelixAdmin APIs and pipeline changes to support Helix Node Swap #2661

HelixAdmin APIs and pipeline changes to support Helix Node Swap #2661

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zpinto commented Oct 17, 2023 • edited Loading

Issues

Description

Tests

Changes that Break Backward Compatibility (Optional)

Documentation (Optional)

Commits

Code Quality

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zpinto commented Oct 17, 2023 •

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