Refactor settings management for plugin #1393

jmazanec15 · 2024-01-18T18:32:06Z

Description

This PR refactors how the k-NN plugin handles settings - it does not change any functionality. Up until now, we had a class called KNNSettings that contained all setting definitions as well as different utility functions for interacting with the settings. The KNNSettings class implements the singleton pattern.

One problem with the KNNSettings class is that it creates a tight coupling of different components of the plugin. For instance, a setting for the model cache is declared in the same place as a setting for filter query. This coupling makes it harder to separate out the different functionality of plugin. This change resolves this by declaring settings in the class they belong to based on functionality. Then, they are registered in the KNNPlugin class.

Here are where the settings are moved to:

KNN_SPACE_TYPE = "index.knn.space_type" -> LegacyFieldMapper.java
KNN_ALGO_PARAM_M = "index.knn.algo_param.m" -> LegacyFieldMapper.java
KNN_ALGO_PARAM_EF_CONSTRUCTION = "index.knn.algo_param.ef_construction" -> LegacyFieldMapper.java
KNN_ALGO_PARAM_EF_SEARCH = "index.knn.algo_param.ef_search" -> LegacyFieldMapper.java
KNN_ALGO_PARAM_INDEX_THREAD_QTY = "knn.algo_param.index_thread_qty" -> JNIService.java
KNN_MEMORY_CIRCUIT_BREAKER_ENABLED = "knn.memory.circuit_breaker.enabled" -> KNNCircuitBreaker.java
KNN_MEMORY_CIRCUIT_BREAKER_LIMIT = "knn.memory.circuit_breaker.limit" -> KNNCircuitBreaker.java
KNN_CIRCUIT_BREAKER_TRIGGERED = "knn.circuit_breaker.triggered" -> KNNCircuitBreaker.java
KNN_CIRCUIT_BREAKER_UNSET_PERCENTAGE = "knn.circuit_breaker.unset.percentage" -> KNNCircuitBreaker.java
KNN_CACHE_ITEM_EXPIRY_ENABLED = "knn.cache.item.expiry.enabled" -> NativeMemoryCacheManager.java
KNN_CACHE_ITEM_EXPIRY_TIME_MINUTES = "knn.cache.item.expiry.minutes" -> NativeMemoryCacheManager.java
KNN_PLUGIN_ENABLED = "knn.plugin.enabled" -> KNNPlugin.java
KNN_INDEX = "index.knn" -> KNNCodecService.java
MODEL_INDEX_NUMBER_OF_SHARDS = "knn.model.index.number_of_shards" -> ModelDao.java
MODEL_INDEX_NUMBER_OF_REPLICAS = "knn.model.index.number_of_replicas" -> ModelDao.java
MODEL_CACHE_SIZE_LIMIT = "knn.model.cache.size.limit" -> ModelCache.java
ADVANCED_FILTERED_EXACT_SEARCH_THRESHOLD = "index.knn.advanced.filtered_exact_search_threshold" -> KNNWeight.java

Along with this, another problem is that the KNNSettings has a set of utility functions that rely on singleton pattern. The singleton pattern makes testing more complex and we are trying to get away from this - this is one step towards that. This change moves those utility functions to the corresponding class and then moves the setting lookup functionality to KNNClusterUtil which is a utility class with the purpose of interacting with the cluster. In the future, I would like to avoid initializing a bunch of classes statically with clusterService and instead depend on KNNClusterUtil - but this is for another review.

One important thing to note is the addition of KNNCircuitBreakerUtil, a static utility class for interacting with the circuit breaker. While these methods could have been moved into the KNNCircuitBreaker directly, it creates somewhat of a circular dependency with NativeMemoryCacheManager. To avoid this, the utility class was created. In the future, this will change when we refactor the KNNCircuitBreaker functionality.

Issues Resolved

#1017

Check List

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codecov · 2024-01-18T19:06:49Z

Codecov Report

Attention: 31 lines in your changes are missing coverage. Please review.

Comparison is base (89fc267) 84.92% compared to head (cb5c451) 84.97%.

Files	Patch %	Lines
...va/org/opensearch/knn/index/KNNCircuitBreaker.java	52.94%	11 Missing and 5 partials ⚠️
...rg/opensearch/knn/index/KNNCircuitBreakerUtil.java	78.78%	6 Missing and 1 partial ⚠️
...in/java/org/opensearch/knn/indices/ModelCache.java	69.23%	3 Missing and 1 partial ⚠️
...main/java/org/opensearch/knn/index/util/Faiss.java	0.00%	0 Missing and 2 partials ⚠️
...ain/java/org/opensearch/knn/index/util/Lucene.java	0.00%	0 Missing and 1 partial ⚠️
...ain/java/org/opensearch/knn/index/util/Nmslib.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1393      +/-   ##
============================================
+ Coverage     84.92%   84.97%   +0.05%     
+ Complexity     1274     1273       -1     
============================================
  Files           167      167              
  Lines          5186     5172      -14     
  Branches        491      487       -4     
============================================
- Hits           4404     4395       -9     
+ Misses          573      570       -3     
+ Partials        209      207       -2

☔ View full report in Codecov by Sentry.
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heemin32 · 2024-01-18T22:11:04Z

One problem with the KNNSettings class is that it creates a tight coupling of different components of the plugin. For instance, a setting for the model cache is declared in the same place as a setting for filter query. This coupling makes it harder to separate out the different functionality of plugin.

What does 'separate out the different functionality of the plugin' mean? When do we need that? I think having every KNN setting in a single place itself does not have any issue unless you have to set up unnecessary resources to make the KNNSettings work, even if all you need is a simple setting value. I don't think that is the case here.

An advantage of having KNNSettings is that it is easy to find what settings are available for the KNN plugin in a single place. I am not in favor of moving all settings to their relevant class.

jmazanec15 · 2024-01-18T22:23:46Z

@heemin32

What does 'separate out the different functionality of the plugin' mean? When do we need that? I think having every KNN setting in a single place itself does not have any issue unless you have to set up unnecessary resources to make the KNNSettings work, even if all you need is a simple setting value. I don't think that is the case here.

In the current implementation, we have utility functions for different functionality spanning across the entire plugin all in one class - KNNSettings.java. For instance, we are setting update consumers for the NativeMemoryCacheManager here: https://github.com/opensearch-project/k-NN/blob/main/src/main/java/org/opensearch/knn/index/KNNSettings.java#L305., but also a method that will get the value for the filtered setting for KNNQueries: https://github.com/opensearch-project/k-NN/blob/main/src/main/java/org/opensearch/knn/index/KNNSettings.java#L379. Thus, for testing something with KNNQuery filter threshold, you may have to worry about the NativeMemoryCacheManager. Overall, this makes it harder to test. Therefore, I think it makes sense for specific classes to own their settings. This is similar to what OpenSearch does: https://github.com/search?q=repo%3Aopensearch-project%2FOpenSearch%20Setting%3C&type=code.

An advantage of having KNNSettings is that it is easy to find what settings are available for the KNN plugin in a single place. I am not in favor of moving all settings to their relevant class.

All of the settings are available in the KNNPlugin.getSettings() method where they are registered. Its more so that a setting is defined in the component that owns the setting.

heemin32 · 2024-01-18T22:53:02Z

Why does NativeMemoryCacheManager matter when testing the KNNQuery filter threshold, considering that setting update consumers do not touch anything regarding the KNNQuery filter threshold value?

It is a fair point is that we know what settings are available for KNN by looking at the KNNPlugin class. However, by having a separate setting class, you also get to know which part of the code is setting-related and which part is not. In that sense, how about having multiple setting classes instead of adding setting codes inside each class? For example, NativeMemorySetting, FilteringSetting, and so on.

jmazanec15 · 2024-01-18T23:06:20Z

Why does NativeMemoryCacheManager matter when testing the KNNQuery filter threshold, considering that setting update consumers do not touch anything regarding the KNNQuery filter threshold value?

It shouldnt matter, but currently in KNNSettings.getFilteredExactSearchThreshold, we need clusterService to execute the call. To set clusterService, we need to call initialize which sets update consumers for nativememorycachemanager: https://github.com/opensearch-project/k-NN/blob/main/src/main/java/org/opensearch/knn/index/KNNSettings.java#L387. So it ends up getting tangled.

However, by having a separate setting class, you also get to know which part of the code is setting-related and which part is not. In that sense, how about having multiple setting classes instead of adding setting codes inside each class? For example, NativeMemorySetting, FilteringSetting, and so on.

We could do this. Before I make the change, though, Im curious what others might think? @VijayanB @martin-gaievski

heemin32 · 2024-01-19T23:34:51Z

It shouldnt matter, but currently in KNNSettings.getFilteredExactSearchThreshold, we need clusterService to execute the call. To set clusterService, we need to call initialize which sets update consumers for nativememorycachemanager: https://github.com/opensearch-project/k-NN/blob/main/src/main/java/org/opensearch/knn/index/KNNSettings.java#L387. So it ends up getting tangled.

IMO, getting tangled is not big concern as of now. I looked at the test code and I haven't seen any improvement on the test code itself. Please point me out if I missed something.

One other thing is, I see you define KNN_ALGO_PARAM_INDEX_THREAD_QTY_SETTING setting in JNIService class and it is being used in TraningJob and KNN80DocValuesConsumer classes. Why JNIService should have it? Wouldn't it be better to have a separate setting class to hold it?

VijayanB · 2024-01-22T20:15:36Z

src/main/java/org/opensearch/knn/index/KNNCircuitBreaker.java

+                final String percentAsString = sValue.substring(0, sValue.length() - 1);
+                try {
+                    final double percent = Double.parseDouble(percentAsString);
+                    if (percent < 0 || percent > 100) {
+                        throw new OpenSearchParseException("percentage should be in [0-100], got [{}]", percentAsString);
+                    }


Can you refactor this to method?

VijayanB · 2024-01-22T20:20:05Z

src/main/java/org/opensearch/knn/index/KNNCircuitBreaker.java

+                    );
+                } else {
+                    logger.info(
+                        "[KNN] Cache capacity below 75% of the circuit breaker limit for all nodes."


is it always 75%?

No. I will update to different messaging here.

VijayanB · 2024-01-22T20:22:03Z

src/main/java/org/opensearch/knn/index/KNNCircuitBreakerUtil.java

+        knnStatsRequest.addStat(StatNames.CACHE_CAPACITY_REACHED.getName());
+        knnStatsRequest.timeout(new TimeValue(1000 * 10)); // 10 second timeout
+
+        KNNStatsResponse knnStatsResponse = client.execute(KNNStatsAction.INSTANCE, knnStatsRequest).get();


since initialize is outside object creation, can you add non-null check for client?

Initial commit of refactoring change around KNNSettings. The goal of the refactor is to tie setting definitions with related resources and make utility class lighter weight. In future commits, I will clean up the KNNSettingsUtil interface and move settings to the classes that best define them. Signed-off-by: John Mazanec <[email protected]>

Signed-off-by: John Mazanec <[email protected]>

Creates a new class called KNNCircuitBreakUtil in order to perform updating of circuit break actions. Unable to move directly into KNNCircuitBreaker due to race conditions that would be produced with the NativeMemoryCacheManager. In the future, CB logic will be refactored as well. Signed-off-by: John Mazanec <[email protected]>

Signed-off-by: John Mazanec <[email protected]>

jmazanec15 · 2024-01-24T16:37:07Z

IMO, getting tangled is not big concern as of now. I looked at the test code and I haven't seen any improvement on the test code itself. Please point me out if I missed something.

@heemin32 I think my concern overall is that we have developed a lot of singleton classes, which create strange testing behavior where several static classes need to be initialize before use. For a couple examples:

After each test, we need to update the singleton cache manager class to invalidate entries - https://github.com/opensearch-project/k-NN/blob/main/src/test/java/org/opensearch/knn/KNNTestCase.java#L64-L65, https://github.com/opensearch-project/k-NN/blob/main/src/test/java/org/opensearch/knn/KNNSingleNodeTestCase.java#L69-L73
After each test, we need to reset counters to avoid flakiness - https://github.com/opensearch-project/k-NN/blob/main/src/test/java/org/opensearch/knn/KNNTestCase.java#L59
For codec service, we need to mock all of these settings classes again - https://github.com/opensearch-project/k-NN/blob/main/src/test/java/org/opensearch/knn/index/codec/KNNCodecTestCase.java#L101-L113
For KNNWeight, we have an elaborate pre-test-class setup due to frequent static classes: https://github.com/opensearch-project/k-NN/blob/main/src/test/java/org/opensearch/knn/index/query/KNNWeightTests.java#L97-L126

My thinking is that by removing KNNSettings class, we can start to move away from this singleton pattern and simplfy testing in the future. Next, we can refactor the CircuitBreaker and then the NativeMemoryCacheManager or ModelDao. However, because these all depend on KNNSettings it makes it difficult to do so.

Additionally, I dont think having all of the settings defined in a single place is good practice. For instance, we are adding settings into this class from other package, (i.e. why is MODEL_INDEX_NUMBER_OF_REPLICAS defined in org.opensearch.knn.index when the model index functionality is in org.opensearch.knn.indices).

One other thing is, I see you define KNN_ALGO_PARAM_INDEX_THREAD_QTY_SETTING setting in JNIService class and it is being used in TraningJob and KNN80DocValuesConsumer classes. Why JNIService should have it? Wouldn't it be better to have a separate setting class to hold it?

Good point. The problem with this setting is that it is ambiguous and potentially not used properly. By the name, KNN_ALGO_PARAM_INDEX_THREAD_QTY_SETTING implies that it is the number of threads used during indexing. However, this is not exactly true:

As you pointed out, it is also used in TrainingJob. This is a bug. There should be a separate setting for TrainingJob
For Lucene, it is not used at all.

With this, it probably makes sense to deprecate the setting and come up with a stronger convention for setting threads. But this is most likely out of scope. That being said, I think the setting should be declared with its intended use. This would be in either the KNN80DocValuesConsumer class or in the KNNCodecService class.

Signed-off-by: John Mazanec <[email protected]>

heemin32 · 2024-01-24T17:10:24Z

Despite the refactoring, those four examples still remain. It is due to the use of static methods, not because of a centralized Setting class.
The Singleton class pattern itself is not inherently bad; the issue lies in how we implement the singleton class, specifically using static variables and methods.
While I agree that refactoring CircuitBreaker, NativeMemoryCacheManager, and ModelDao is necessary for better testability, I propose achieving this by introducing their own setting class if needed.

I believe this pull request primarily addresses the preference for shaping our codebase. It may be challenging to incrementally remove static methods if we stick with current state though.

Single setting class for the entire knn plugin
Multiple setting classes for each feature
No setting class; define settings inside each individual class.
Define settings inside each individual class; if a setting is used in multiple places, create a Settings class.

The current state is option 1, and this PR aligns with option 3. Personally, I prefer option 2 as I believe it will simplify unit testing. I'm interested in hearing others' opinions as well.

jmazanec15 · 2024-01-24T21:22:53Z

That makes sense thanks @heemin32. I still lean towards 3, but would be good to hear from other folks @navneet1v @VijayanB

VijayanB · 2024-01-25T18:42:11Z

That makes sense thanks @heemin32. I still lean towards 3, but would be good to hear from other folks @navneet1v @VijayanB

I prefer option 3 too

navneet1v · 2024-01-29T16:08:50Z

@jmazanec15 , @heemin32 , @VijayanB
First thing this is a great cleanup/refactoring @jmazanec15 you have picked up. I would like to think this in terms of single responsibility principle from SOLID Principles. Ref: https://www.baeldung.com/solid-principles

Putting settings in the classes like KNNWeight.class, CircuitBreaker.class breaks the single responsibility principle, as the class lets say CircuitBreaker.class has more than 1 responsibility which is holding the logic to define, set, unset the CB settings and then also the logic to trigger CB. Same goes for other classes too. Hence in my opinion we should have separate settings classes. Now what should be those classes we can discuss on that but in terms of functionality/behavior of a settings class it should be:

Provide a way for KNNPlugin.class.getSettings() method to get all the settings which are defined by that class.
Provide a way to update the settings.
Provide a way to read a setting(cluster level or index level).
Easy to mock i.e. we should not be mocking a bunch of static functions. It should be a clean mock. (This is optional, but I want to stress on this as one of the reason why we are doing this refactoring was to provide an easy way to mock settings class.)

Single setting class for the entire knn plugin

Multiple setting classes for each feature

No setting class; define settings inside each individual class.

Define settings inside each individual class; if a setting is used in multiple places, create a Settings class.

The current state is option 1, and this PR aligns with option 3. Personally, I prefer option 2 as I believe it will simplify unit testing. I'm interested in hearing others' opinions as well.

having said all this, I am with option 2. But with a small tweak which is I am not stressing on settings class per feature as of now. We can do some other grouping but settings should be in separate classes for sure and should be coupled with other classes like CircuitBreaker, KNNWeight.class

jmazanec15 · 2024-01-29T20:42:19Z

Thanks @navneet1v

Putting settings in the classes like KNNWeight.class, CircuitBreaker.class breaks the single responsibility principle, as the class lets say CircuitBreaker.class has more than 1 responsibility which is holding the logic to define, set, unset the CB settings and then also the logic to trigger CB.

I would say the CircuitBreaker is an outlier. I see settings as a structured way for users to tune the functionality of the system. We implement the circuit breaker as a setting - but I believe this is a mistake and should be done (if at all) via cluster metadata as opposed to cluster settings. I havent seen other cases in the OpenSearch ecosystem that operate similarly.

Additionally (and curious your thoughts on this) I think that it is best practice for settings to limit functionality impacted to a specific component. For instance, with the circuit breaker limit - the value provided by this setting should be used for one thing - setting the cache size. In practice, this results in the value being read directly in one component.

Now what should be those classes we can discuss on that but in terms of functionality/behavior of a settings class it should be:
1. Provide a way for KNNPlugin.class.getSettings() method to get all the settings which are defined by that class.
2. Provide a way to update the settings.
3. Provide a way to read a setting(cluster level or index level).
4. Easy to mock i.e. we should not be mocking a bunch of static functions. It should be a clean mock. (This is optional, but I want to stress on this as one of the reason why we are doing this refactoring was to provide an easy way to mock settings class.)

I would say for (2), we should not make a habit of the plugin altering settings directly. I see a setting as the way a user, not the plugin, can tune functionality.

For (3), I think it would be better to use a class like KNNClusterUtil, that takes a setting and can get the value. So, something like:

KNNClusterUtil
    /**
     * Get setting value for the cluster. Return default if not set.
     *
     * @param <T> Setting type
     * @return T     setting value or default
     */
    public <T> T getClusterSetting(Setting<T> setting) {
        return clusterService.getClusterSettings().get(setting);
    }

I like this approach because it reduces the duplicated code (fewer classes depending on ClusterService) and it makes it clear that the caller is taking a dependency on a setting, which is sometimes unclear when using static utility methods.

One other point of functionality that needs to be implemented somewhere is registering settings update consumers. For the KNNCache related settings, these trigger things like cache rebuilding. So, for these, would it be better to have them registered in the settings class or in the KNNCacheClass. My feeling is registering in the KNNCache class would prevent adding extra dependencies in a generic settings class.

jmazanec15 · 2024-03-26T15:25:18Z

jmazanec15 added Refactoring Improve the design, structure, and implementation while preserving its functionality backport 2.x labels Jan 18, 2024

jmazanec15 marked this pull request as ready for review January 18, 2024 20:25

jmazanec15 requested review from heemin32, navneet1v, VijayanB, vamshin, naveentatikonda, junqiu-lei, martin-gaievski and ryanbogan as code owners January 18, 2024 20:25

VijayanB reviewed Jan 22, 2024

View reviewed changes

jmazanec15 added 10 commits January 23, 2024 14:54

Organize KNNSettings for refactoring

02e435e

Signed-off-by: John Mazanec <[email protected]>

Move SpaceTypeValidator to SpaceType class

a7edf5a

Signed-off-by: John Mazanec <[email protected]>

Move onIndexModule into plugin

db0ece4

Signed-off-by: John Mazanec <[email protected]>

Move parsers back into defs

500385d

Signed-off-by: John Mazanec <[email protected]>

Move setting consumer to NativeMemoryCacheManager

0af13a2

Signed-off-by: John Mazanec <[email protected]>

Move setting list into KNNPlugin

4b0c355

Signed-off-by: John Mazanec <[email protected]>

Remote setClusterService for KNNSettings

fe02ca3

Signed-off-by: John Mazanec <[email protected]>

Move setting definitions to respective classes

b54d276

Signed-off-by: John Mazanec <[email protected]>

jmazanec15 added 6 commits January 23, 2024 15:10

Relocate getter utility methods

d0b22d1

Signed-off-by: John Mazanec <[email protected]>

Move dynamic settings to NativeCacheManager

bb5720b

Signed-off-by: John Mazanec <[email protected]>

Remove the KNNSettings class

183a286

Signed-off-by: John Mazanec <[email protected]>

Fix broken test case

866886e

Signed-off-by: John Mazanec <[email protected]>

Remove space type validator class

57d085b

Signed-off-by: John Mazanec <[email protected]>

Update changelog

4e5b546

Signed-off-by: John Mazanec <[email protected]>

jmazanec15 force-pushed the issue-1017 branch from 8ed22d5 to 4e5b546 Compare January 23, 2024 23:30

jmazanec15 requested a review from VijayanB January 24, 2024 16:37

jmazanec15 added 2 commits January 24, 2024 08:39

Address minor PR comments

4354683

Signed-off-by: John Mazanec <[email protected]>

Move index_thread_qty to KNNCodecService

cb5c451

Signed-off-by: John Mazanec <[email protected]>

heemin32 mentioned this pull request Feb 13, 2024

Bump faiss lib commit to 32f0e8cf92cd2275b60364517bb1cce67aa29a55 #1443

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Refactor settings management for plugin #1393

Refactor settings management for plugin #1393

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Refactor settings management for plugin #1393

Refactor settings management for plugin #1393

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