Improve single schema cache (#7214)

* Initial Commit

* fix flaky test

* temporary set ci timeout

* turn off ci check

* fix postgres tests

* fix tests

* node flaky test

* remove improvements

* Update SchemaPerformance.spec.js

* fix tests

* revert ci

* Create Singleton Object

* properly clear cache testing

* Cleanup

* remove fit

* try PushController.spec

* try push test rewrite

* try push enqueue time

* Increase test timeout

* remove pg server creation test

* xit push tests

* more xit

* remove skipped tests

* Fix conflicts

* reduce ci timeout

* fix push tests

* Revert "fix push tests"

This reverts commit 05aba62f1cbbca7d5d3e80b9444529f59407cb56.

* improve initialization

* fix flaky tests

* xit flaky test

* Update CHANGELOG.md

* enable debug logs

* Update LogsRouter.spec.js

* create initial indexes in series

* lint

* horizontal scaling documentation

* Update Changelog

* change horizontalScaling db option

* Add enableSchemaHooks option

* move enableSchemaHooks to databaseOptions

src/Options/Definitions.js

@@ -100,7 +100,7 @@ module.exports.ParseServerOptions = {
   },
   databaseOptions: {
     env: 'PARSE_SERVER_DATABASE_OPTIONS',
-    help: 'Options to pass to the mongodb client',
+    help: 'Options to pass to the database client',
     action: parsers.objectParser,
   },
   databaseURI: {
@@ -149,13 +149,6 @@ module.exports.ParseServerOptions = {
     action: parsers.booleanParser,
     default: false,
   },
-  enableSingleSchemaCache: {
-    env: 'PARSE_SERVER_ENABLE_SINGLE_SCHEMA_CACHE',
-    help:
-      'Use a single schema cache shared across requests. Reduces number of queries made to _SCHEMA, defaults to false, i.e. unique schema cache per request.',
-    action: parsers.booleanParser,
-    default: false,
-  },
   encryptionKey: {
     env: 'PARSE_SERVER_ENCRYPTION_KEY',
     help: 'Key for encrypting your files',
@@ -366,13 +359,6 @@ module.exports.ParseServerOptions = {
     action: parsers.booleanParser,
     default: false,
   },
-  schemaCacheTTL: {
-    env: 'PARSE_SERVER_SCHEMA_CACHE_TTL',
-    help:
-      'The TTL for caching the schema for optimizing read/write operations. You should put a long TTL when your DB is in production. default to 5000; set 0 to disable.',
-    action: parsers.numberParser('schemaCacheTTL'),
-    default: 5000,
-  },
   security: {
     env: 'PARSE_SERVER_SECURITY',
     help: 'The security options to identify and report weak security settings.',
@@ -788,3 +774,12 @@ module.exports.FileUploadOptions = {
     default: false,
   },
 };
+module.exports.DatabaseOptions = {
+  enableSchemaHooks: {
+    env: 'PARSE_SERVER_DATABASE_ENABLE_SCHEMA_HOOKS',
+    help:
+      'Enables database hooks to update single schema cache. Set to true if using multiple Parse Servers instances connected to the same database.',
+    action: parsers.booleanParser,
+    default: false,
+  },
+};