Allocation service changes for batch assignment #8888

Gaurav614 · 2023-07-26T05:25:04Z

Description

This pull request is part of the improvement #5098
It is mainly focused around changes for Allocation Service with respect to batch assignment. The PR is not completed as PR for adding a setting for batch mode is pending. For now we are taking a boolean value, and will later change it to fetch from the setting once those changes are ready.
The PR is dependent on following PRs:
#8742
#8218
#8356
#8746

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

New functionality includes testing.
- All tests pass
New functionality has been documented.
- New functionality has javadoc added
Commits are signed per the DCO using --signoff
Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

Signed-off-by: Gaurav Chandani <[email protected]>

github-actions · 2023-07-26T05:33:48Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/20961/
CommitID: 432efc1
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opensearch-trigger-bot · 2023-08-25T15:21:01Z

This PR is stalled because it has been open for 30 days with no activity. Remove stalled label or comment or this will be closed in 7 days.

opensearch-trigger-bot · 2023-09-01T15:21:10Z

This PR was closed because it has been stalled for 7 days with no activity.

Signed-off-by: Gaurav Chandani <[email protected]>

amkhar · 2023-11-29T10:06:38Z

Need to revive this PR.

github-actions · 2023-11-29T11:07:55Z

Compatibility status:

Checks if related components are compatible with change d3b1140

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github-actions · 2023-11-29T11:15:09Z

❌ Gradle check result for eecf79f: FAILURE

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github-actions · 2023-11-29T11:23:10Z

❌ Gradle check result for eecf79f: FAILURE

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Signed-off-by: Gaurav Chandani <[email protected]>

github-actions · 2023-11-29T12:09:39Z

❌ Gradle check result for c2be078: FAILURE

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khushbr · 2023-12-05T06:07:20Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

@@ -114,6 +118,22 @@ public AllocationService(
        this.shardsAllocator = shardsAllocator;
        this.clusterInfoService = clusterInfoService;
        this.snapshotsInfoService = snapshotsInfoService;
+        this.settings = Settings.EMPTY;


We can use constructor chaining for Line 117 - 121:

this(allocationDeciders, shardsAllocator, clusterInfoService, snapshotsInfoService, Settings.EMPTY);

khushbr · 2023-12-05T06:08:57Z

server/src/main/java/org/opensearch/cluster/routing/allocation/ExistingShardsAllocator.java

@@ -60,6 +60,13 @@ public interface ExistingShardsAllocator {
        Setting.Property.PrivateIndex
    );

+    public static final Setting<Boolean> EXISTING_SHARDS_ALLOCATOR_BATCH_MODE_ENABLED = Setting.boolSetting(


nit: Rename to EXISTING_SHARDS_ALLOCATOR_BATCH_MODE ?

khushbr · 2023-12-05T06:10:04Z

server/src/main/java/org/opensearch/cluster/routing/allocation/ExistingShardsAllocator.java

@@ -60,6 +60,13 @@ public interface ExistingShardsAllocator {
        Setting.Property.PrivateIndex
    );



Java doc here, we are adding a new public setting. Highly recommend adding multi-line comment explaining the purpose of the setting.

server/src/main/java/org/opensearch/cluster/routing/allocation/ExistingShardsAllocator.java

1. Moved setting of batch enable disable in this PR 2. Added java docs Signed-off-by: Gaurav Chandani <[email protected]>

github-actions · 2023-12-05T13:46:23Z

❌ Gradle check result for 3bb7dd8: FAILURE

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amkhar · 2023-12-05T16:37:14Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+        RoutingNodes.UnassignedShards unassignedShards = allocation.routingNodes().unassigned();
+        RoutingNodes.UnassignedShards.UnassignedIterator iterator = unassignedShards.iterator();


Can be clubbed into single line ?

not possible, we need both variables later

amkhar · 2023-12-05T16:40:59Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+            ShardRouting shard = iterator.next();
+            currentAllocatorForShard = getAllocatorForShard(shard, allocation);


Single line ?

khushbr

LGTM!

vikasvb90 · 2023-12-07T13:59:14Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

@@ -548,6 +564,22 @@ private void allocateExistingUnassignedShards(RoutingAllocation allocation) {
            existingShardsAllocator.beforeAllocation(allocation);
        }

+        Boolean batchModeEnabled = EXISTING_SHARDS_ALLOCATOR_BATCH_MODE.get(settings);
+
+        if (batchModeEnabled && allocation.nodes().getMinNodeVersion().onOrAfter(Version.CURRENT)) {


We need to set this to the version in which we plan to release this feature. Please make a note of it. I think its fine to keep it current for safety purpose to avoid merging old version in a higher version release. But make sure it gets changed before merge.

You may want to control it better with mixed cluster rest/integ test.

Ya, right now it's CURRENT for main branch.
When it goes to 2.x - it'll go with 2.12 version
Then again in main it'll be changed to 2.12

Basically 3 phased commits.

@Gaurav614
There must be unit or integ test verifying the if-else logic. Based on commits, UT/integ checks will also be changed.

for the main branch, it has to be 3.0 and not Version.CURRENT

tests are missing to check if batch/ non batch mode is picked correctly.

vikasvb90 · 2023-12-07T14:07:10Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+            while (iterator.hasNext()) {
+                ExistingShardsAllocator allocatorForShard = getAllocatorForShard(iterator.next(), allocation);
+                if (currentAllocatorForShard.getClass().getName().equals(allocatorForShard.getClass().getName()) == false) {
+                    return null;


What do you plan to do with null if allocator was found different? Shouldn't be possible right given there's no code bug? Do you think IllegalStateException would be a better fit?

It wont be IllegalStateException with respect to AllocationService since it will fallback to non batched version.
Null is send because we didnt have same Allocators set

probably I will rename it to getAndVerifySameAllocatorForAllUnassignedShards

vikasvb90 · 2023-12-07T14:10:25Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+                }
+                allocator.allocateUnassignedBatch(allocation, false);
+                return;
+            }


If allocator was found null, then execution would come out of this if block and continue with single shard allocation. Is this intended? Shouldn't we be throwing an exception from verifySameAllocatorForAllUnassignedShards and remove this null check altogether?

not it wont assign a single shard, but try to assign All unassigned Shards
@amkhar I think you made some suggestion to rename allocateUnassignedBatch to allocateAllUnassignedShards?

Yes, this method ultimately allocates all unassigned shards. And UnassignedBatch feels like a single batch is getting assigned.

So, we can change it to allocateAllUnassignedShards. Feel free to suggest other better/relevant names.

I don't like this complication. If the cluster is using single ExistingShardAllocator, then use batch mode otherwise let it fall back to single shard allocation. This should change later to batch mode code which is dealing with single ShardRouting once there is more confidence in the new code with batch mode.

Add a warning log that it can't use batch due to multiple ExistingShardAllocator, it is recommending to use one so that batch logic can run effectively.

Done. So we are currently not allowing any CustomAllocator that implements the new method that we introduced to allocateUnassignedBatch [renamed to allocateAllUnassignedShards] to run its implementation and we are using are own implementation for now.

Signed-off-by: Gaurav Chandani <[email protected]>

github-actions · 2023-12-14T11:26:57Z

❌ Gradle check result for 6e645a0: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

Signed-off-by: Gaurav Chandani <[email protected]>

github-actions · 2023-12-20T06:26:34Z

❌ Gradle check result for b1994fa: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

shwetathareja · 2024-01-04T10:12:22Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

@@ -548,6 +564,22 @@ private void allocateExistingUnassignedShards(RoutingAllocation allocation) {
            existingShardsAllocator.beforeAllocation(allocation);
        }

+        Boolean batchModeEnabled = EXISTING_SHARDS_ALLOCATOR_BATCH_MODE.get(settings);
+
+        if (batchModeEnabled && allocation.nodes().getMinNodeVersion().onOrAfter(Version.CURRENT)) {


for the main branch, it has to be 3.0 and not Version.CURRENT

shwetathareja · 2024-01-04T10:20:46Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+     * @param allocation {@link RoutingAllocation}
+     * @return {@link ExistingShardsAllocator} or null
+     */
+    private ExistingShardsAllocator getAndVerifySameAllocatorForAllUnassignedShards(RoutingAllocation allocation) {


Why do we need this elaborate check? Simply check if there are more than one ExistingShardAllocator, bail out and use single shard allocation, which will be eventually moved to batch code path with one shardRouting.

Using GA for existing one shardRouting.

Have different ExistingShardsAllocator implementation after this suggestion. Still open for more discussion https://github.com/opensearch-project/OpenSearch/pull/8746/files#r1432764512

shwetathareja · 2024-01-04T10:42:26Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+                }
+                allocator.allocateUnassignedBatch(allocation, false);
+                return;
+            }


I don't like this complication. If the cluster is using single ExistingShardAllocator, then use batch mode otherwise let it fall back to single shard allocation. This should change later to batch mode code which is dealing with single ShardRouting once there is more confidence in the new code with batch mode.

shwetathareja · 2024-01-04T10:43:31Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+                }
+                allocator.allocateUnassignedBatch(allocation, false);
+                return;
+            }


Add a warning log that it can't use batch due to multiple ExistingShardAllocator, it is recommending to use one so that batch logic can run effectively.

server/src/main/java/org/opensearch/cluster/routing/allocation/ExistingShardsAllocator.java

shwetathareja · 2024-01-04T10:45:04Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

@@ -548,6 +564,22 @@ private void allocateExistingUnassignedShards(RoutingAllocation allocation) {
            existingShardsAllocator.beforeAllocation(allocation);
        }

+        Boolean batchModeEnabled = EXISTING_SHARDS_ALLOCATOR_BATCH_MODE.get(settings);
+
+        if (batchModeEnabled && allocation.nodes().getMinNodeVersion().onOrAfter(Version.CURRENT)) {


tests are missing to check if batch/ non batch mode is picked correctly.

ticheng-aws · 2024-01-05T23:31:26Z

Hi @Gaurav614, the PR is stalled for some time. Do we have any updates?

1. Made changes so that Allocation Service run only default implementation of batch mode 2. Renamed methods 3. Added and modified documenatation Signed-off-by: Gaurav Chandani <[email protected]>

github-actions · 2024-01-12T08:15:28Z

❌ Gradle check result for 257f36d: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

Gaurav614 · 2024-01-12T08:40:23Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

-                ImmutableOpenMap.Builder<String, ClusterState.Custom> customsBuilder = ImmutableOpenMap.builder(allocation.getCustoms());
+                final Map<String, ClusterState.Custom> customsBuilder = new HashMap<>(allocation.getCustoms());
                customsBuilder.put(RestoreInProgress.TYPE, updatedRestoreInProgress);
-                newStateBuilder.customs(customsBuilder.build());
+                newStateBuilder.customs(customsBuilder);


Not sure how this diff got its way, Will remove.

@Gaurav614 - is it resolved ?

shwetathareja

Minor comments @Gaurav614

shwetathareja · 2024-01-24T11:42:26Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

@@ -183,9 +200,9 @@ private ClusterState buildResult(ClusterState oldState, RoutingAllocation alloca
        if (restoreInProgress != null) {
            RestoreInProgress updatedRestoreInProgress = allocation.updateRestoreInfoWithRoutingChanges(restoreInProgress);
            if (updatedRestoreInProgress != restoreInProgress) {
-                ImmutableOpenMap.Builder<String, ClusterState.Custom> customsBuilder = ImmutableOpenMap.builder(allocation.getCustoms());
+                final Map<String, ClusterState.Custom> customsBuilder = new HashMap<>(allocation.getCustoms());


is there a reason we made it mutable from immutable map

Thanks for pointing out this diff. I am not sure how this diff got way. Will restore to whats there in main.

shwetathareja · 2024-01-24T11:44:05Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

+         Use batch mode if enabled and there is no custom allocator set for Allocation service
+         */
+        Boolean batchModeEnabled = EXISTING_SHARDS_ALLOCATOR_BATCH_MODE.get(settings);
+        if (batchModeEnabled && allocation.nodes().getMinNodeVersion().onOrAfter(Version.CURRENT) && existingShardsAllocators.size() == 2) {


the check for ==2 here is for GatewayAllocator & BatchGatewayAllocator?

this version check should be against 3.0.0

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

shwetathareja · 2024-01-24T11:47:35Z

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

@@ -670,7 +704,7 @@ private ExistingShardsAllocator getAllocatorForShard(ShardRouting shardRouting,
        final String allocatorName = ExistingShardsAllocator.EXISTING_SHARDS_ALLOCATOR_SETTING.get(
            routingAllocation.metadata().getIndexSafe(shardRouting.index()).getSettings()
        );
-        final ExistingShardsAllocator existingShardsAllocator = existingShardsAllocators.get(allocatorName);
+        ExistingShardsAllocator existingShardsAllocator = existingShardsAllocators.get(allocatorName);


why remove final?

Will Add back

server/src/main/java/org/opensearch/cluster/routing/allocation/AllocationService.java

shwetathareja · 2024-01-24T11:49:06Z

server/src/main/java/org/opensearch/cluster/routing/allocation/ExistingShardsAllocator.java

+     * If enable to true then it expects all indices of the shard to use same {@link ExistingShardsAllocator}, otherwise
+     * Allocation Service will fallback to default implementation i.e. {@link ExistingShardsAllocator#allocateUnassigned(ShardRouting, RoutingAllocation, UnassignedAllocationHandler)}


you dont need this.

shwetathareja · 2024-01-24T11:53:03Z

server/src/main/java/org/opensearch/cluster/routing/allocation/ExistingShardsAllocator.java

+     * Enable this setting if your ExistingShardAllocator is implementing the
+     * {@link ExistingShardsAllocator#allocateAllUnassignedShards(RoutingAllocation, boolean)} method.
+     * The default implementation of this method is not optimized and assigns shards one by one.


By enabling this setting, GatewayAllocator will use batch implementation by default. In case of custom ExistingShardAllocator , the performance benefits will be visible if {@link ExistingShardsAllocator#allocateAllUnassignedShards(RoutingAllocation, boolean)} method is implemented efficiently for batch mode.

No, if custom Allocator is set we wont be even running allocateAllUnassignedShards in AllocationService.

This was discussed here

shwetathareja · 2024-01-24T11:53:51Z

server/src/main/java/org/opensearch/cluster/routing/allocation/ExistingShardsAllocator.java

+     * {@link ShardsBatchGatewayAllocator}. Right now even if plugin implements it, AllocationService will run the
+     * default implementation to enable Batch mode of assignment
+     *
+     * TODO: Currently its implementation is WIP for GatewayAllocator so setting enabling wont have any effect
+     * https://github.com/opensearch-project/OpenSearch/issues/5098


Right now and the below part is un-necessary

you can say this setting is experimental at this point.

Okay , will update

Signed-off-by: Gaurav Chandani <[email protected]>

github-actions · 2024-02-12T10:04:09Z

❌ Gradle check result for 1574fc2: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

shwetathareja · 2024-03-13T07:20:15Z

No comment, @amkhar need to resolve the conflict and this PR we will merge in the end, once all the other feature PRs are merged.

Signed-off-by: Aman Khare <[email protected]>

github-actions · 2024-03-13T07:36:57Z

❌ Gradle check result for d3b1140: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

Merging PR: opensearch-project#8888 into this PR since AllocationService changes were required to run Integ tests for testing the flow end to end. Signed-off-by: Gaurav Chandani <[email protected]>

opensearch-trigger-bot · 2024-04-14T16:42:19Z

This PR is stalled because it has been open for 30 days with no activity.

Allocation service changes for batch assignment

432efc1

Signed-off-by: Gaurav Chandani <[email protected]>

This was referenced Jul 26, 2023

[BUG] Async shard fetches taking up GBs of memory causing ClusterManager JVM to spike with large no. of shards (> 50k) #5098

Open

[META] Cluster Manager Async Shard Fetch Revamp #8098

Open

opensearch-trigger-bot bot added the stalled Issues that have stalled label Aug 25, 2023

opensearch-trigger-bot bot closed this Sep 1, 2023

Added batch mode setting

eecf79f

Signed-off-by: Gaurav Chandani <[email protected]>

gbbafna reopened this Nov 29, 2023

Added missed clusterModule changes

c2be078

Signed-off-by: Gaurav Chandani <[email protected]>

khushbr reviewed Dec 5, 2023

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Gaurav614 marked this pull request as ready for review December 5, 2023 06:36

Gaurav614 requested review from abbashus, adnapibar, anasalkouz, andrross, Bukhtawar, CEHENKLE, dblock, dbwiddis, dreamer-89, gbbafna, kartg and kotwanikunal as code owners December 5, 2023 06:36

Gaurav614 requested review from sohami, tlfeng and VachaShah as code owners December 5, 2023 06:36

Gaurav614 mentioned this pull request Dec 5, 2023

Async Batch shards changes for GatewayAllocator #8746

Merged

4 tasks

Addressed PR comments

3bb7dd8

1. Moved setting of batch enable disable in this PR 2. Added java docs Signed-off-by: Gaurav Chandani <[email protected]>

amkhar reviewed Dec 6, 2023

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khushbr approved these changes Dec 6, 2023

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vikasvb90 reviewed Dec 7, 2023

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Added Changes for ShardBatchGatewayAllocator

6e645a0

Signed-off-by: Gaurav Chandani <[email protected]>

Cosmetic changes in AllocationService

b1994fa

Signed-off-by: Gaurav Chandani <[email protected]>

shwetathareja reviewed Jan 4, 2024

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opensearch-trigger-bot bot removed the stalled Issues that have stalled label Jan 11, 2024

PR comments

257f36d

1. Made changes so that Allocation Service run only default implementation of batch mode 2. Renamed methods 3. Added and modified documenatation Signed-off-by: Gaurav Chandani <[email protected]>

Gaurav614 commented Jan 12, 2024

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amkhar approved these changes Jan 24, 2024

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shwetathareja reviewed Jan 24, 2024

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Fixed PR comments around documentation

1574fc2

Signed-off-by: Gaurav Chandani <[email protected]>

Correct version check with 3.0.0

d3b1140

Signed-off-by: Aman Khare <[email protected]>

opensearch-trigger-bot bot added the stalled Issues that have stalled label Apr 14, 2024

		@@ -60,6 +60,13 @@ public interface ExistingShardsAllocator {
		Setting.Property.PrivateIndex
		);

		RoutingNodes.UnassignedShards unassignedShards = allocation.routingNodes().unassigned();
		RoutingNodes.UnassignedShards.UnassignedIterator iterator = unassignedShards.iterator();

		ShardRouting shard = iterator.next();
		currentAllocatorForShard = getAllocatorForShard(shard, allocation);

		* If enable to true then it expects all indices of the shard to use same {@link ExistingShardsAllocator}, otherwise
		* Allocation Service will fallback to default implementation i.e. {@link ExistingShardsAllocator#allocateUnassigned(ShardRouting, RoutingAllocation, UnassignedAllocationHandler)}

Allocation service changes for batch assignment #8888

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Allocation service changes for batch assignment #8888

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Gaurav614 commented Jul 26, 2023

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