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Optimize saved objects getScopedClient and HTTP API #68221

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merged 5 commits into from
Jun 5, 2020
Merged

Optimize saved objects getScopedClient and HTTP API #68221

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c5e446a
Create a single repository to be shared by all calls to getScopedClient
rudolf Jun 4, 2020
ef30e36
Cache migrator.getActiveMappings to improve createRepository
rudolf Jun 4, 2020
fa04609
Use typeregistry.getAllTypes instead of getRootPropertiesObjects(mapp…
rudolf Jun 4, 2020
cc98fa6
Don't validate plugin's config every time it's read
rudolf Jun 4, 2020
9ffcf55
Fix saved_objects_mixin
rudolf Jun 4, 2020
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6 changes: 3 additions & 3 deletions src/core/server/plugins/plugin_context.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
* under the License.
*/

import { map } from 'rxjs/operators';
import { map, shareReplay } from 'rxjs/operators';
import { combineLatest } from 'rxjs';
import { CoreContext } from '../core_context';
import { PluginWrapper } from './plugin';
Expand Down Expand Up @@ -107,8 +107,8 @@ export function createPluginInitializerContext(
* @param ConfigClass A class (not an instance of a class) that contains a
* static `schema` that we validate the config at the given `path` against.
*/
create() {
return coreContext.configService.atPath(pluginManifest.configPath);
create<T>() {
return coreContext.configService.atPath<T>(pluginManifest.configPath).pipe(shareReplay(1));
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The spaces plugin takes a config value for every getScopedClient call (every incoming request). This does config validation for this config path each time.

kibana/x-pack/plugins/spaces/server/spaces_service/spaces_service.ts

Lines 75 to 82 in c5e446a

const getScopedClient = async (request: KibanaRequest) => {
const [coreStart] = await getStartServices();
const internalRepository = await internalRepositoryPromise;
return config$
.pipe(
take(1),
map((config) => {

We could optimize the plugin to not take a new config value every time but only if a new value was emitted, but this felt like a better fix that will probably benefit other places.

},
createIfExists() {
return coreContext.configService.optionalAtPath(pluginManifest.configPath);
Expand Down
6 changes: 5 additions & 1 deletion src/core/server/saved_objects/migrations/kibana/kibana_migrator.ts
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Expand Up @@ -74,6 +74,7 @@ export class KibanaMigrator {
private readonly status$ = new BehaviorSubject<KibanaMigratorStatus>({
status: 'waiting',
});
private readonly activeMappings: IndexMapping;

/**
* Creates an instance of KibanaMigrator.
Expand All @@ -100,6 +101,9 @@ export class KibanaMigrator {
validateDoc: docValidator(savedObjectValidations || {}),
log: this.log,
});
// Building the active mappings (and associated md5sums) is an expensive
// operation so we cache the result
this.activeMappings = buildActiveMappings(this.mappingProperties);
}

/**
Expand Down Expand Up @@ -172,7 +176,7 @@ export class KibanaMigrator {
*
*/
public getActiveMappings(): IndexMapping {
return buildActiveMappings(this.mappingProperties);
return this.activeMappings;
}

/**
Expand Down
2 changes: 1 addition & 1 deletion src/core/server/saved_objects/service/lib/repository.ts
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Expand Up @@ -136,7 +136,7 @@ export class SavedObjectsRepository {
injectedConstructor: any = SavedObjectsRepository
): ISavedObjectsRepository {
const mappings = migrator.getActiveMappings();
const allTypes = Object.keys(getRootPropertiesObjects(mappings));
const allTypes = typeRegistry.getAllTypes().map((t) => t.name);
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apparently Object.entries() which gets called from inside getRootPropertiesObjects is very slow.

Pierre already refactored many places where we use this round about getRootPropertiesObjects way to get all the types, but there's still a few remaining.

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Some getRootPropertiesObjects were kept because of the config 'virtual' type that wasn't properly registered to the registry. But this has been resolved since, so we're safe to remove all the remaining usages.

Very surprised Object.keys is a bottleneck, even if it makes sense that typeRegistry.getAllTypes() is faster as the registry is based on a Map.

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@mshustov mshustov Jun 5, 2020 •
edited
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Probably it's not Object.keys but getRootPropertiesObjects mutating an object?

kibana/src/core/server/saved_objects/mappings/lib/get_root_properties_objects.ts

Line 52 in 3d39cd5

acc[key] = value;

v8 cannot optimizie this case https://richardartoul.github.io/jekyll/update/2015/04/26/hidden-classes.html

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Right, I misread and thought it was just a call to getRootProperties

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This was the line that showed up in the profiler and took almost 5ms:

kibana/src/core/server/saved_objects/mappings/lib/get_root_properties_objects.ts

Line 46 in ea7c78d

return Object.entries(rootProperties).reduce((acc, [key, value]) => {

const serializer = new SavedObjectsSerializer(typeRegistry);
const visibleTypes = allTypes.filter((type) => !typeRegistry.isHidden(type));

Expand Down
3 changes: 1 addition & 2 deletions src/legacy/server/saved_objects/saved_objects_mixin.js
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Expand Up @@ -27,14 +27,13 @@ import {
importSavedObjectsFromStream,
resolveSavedObjectsImportErrors,
} from '../../../core/server/saved_objects';
import { getRootPropertiesObjects } from '../../../core/server/saved_objects/mappings';
import { convertTypesToLegacySchema } from '../../../core/server/saved_objects/utils';

export function savedObjectsMixin(kbnServer, server) {
const migrator = kbnServer.newPlatform.__internals.kibanaMigrator;
const typeRegistry = kbnServer.newPlatform.start.core.savedObjects.getTypeRegistry();
const mappings = migrator.getActiveMappings();
const allTypes = Object.keys(getRootPropertiesObjects(mappings));
const allTypes = typeRegistry.getAllTypes().map((t) => t.name);
const schema = new SavedObjectsSchema(convertTypesToLegacySchema(typeRegistry.getAllTypes()));
const visibleTypes = allTypes.filter((type) => !schema.isHiddenType(type));

Expand Down
11 changes: 7 additions & 4 deletions x-pack/plugins/spaces/server/spaces_service/spaces_service.ts
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Expand Up @@ -68,14 +68,18 @@ export class SpacesService {
return spaceId;
};

const internalRepositoryPromise = getStartServices().then(([coreStart]) =>
coreStart.savedObjects.createInternalRepository(['space'])
);

const getScopedClient = async (request: KibanaRequest) => {
const [coreStart] = await getStartServices();
const internalRepository = await internalRepositoryPromise;
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createScopedRepository already creates a new repository for every request, so after the other improvements it's probably not that critical that we re-use this repository instead of creating a new one. But since this is on the hot path it felt like it doesn't hurt to keep this minor improvement around.


return config$
.pipe(
take(1),
map((config) => {
const internalRepository = coreStart.savedObjects.createInternalRepository(['space']);

const callWithRequestRepository = coreStart.savedObjects.createScopedRepository(
request,
['space']
Expand All @@ -92,8 +96,7 @@ export class SpacesService {
internalRepository,
request
);
}),
take(1)
})
)
.toPromise();
};
Expand Down