diff --git a/extensions/oplogPopulator/OplogPopulator.js b/extensions/oplogPopulator/OplogPopulator.js
index 5afe825297..6451c02308 100644
--- a/extensions/oplogPopulator/OplogPopulator.js
+++ b/extensions/oplogPopulator/OplogPopulator.js
@@ -9,10 +9,14 @@ const Allocator = require('./modules/Allocator');
 const ConnectorsManager = require('./modules/ConnectorsManager');
 const { ZenkoMetrics } = require('arsenal').metrics;
 const OplogPopulatorMetrics = require('./OplogPopulatorMetrics');
+const { OplogPopulatorConfigJoiSchema } = require('./OplogPopulatorConfigValidator')
+const { mongoJoi } = require('../../lib/config/configItems.joi')
 
 const paramsJoi = joi.object({
-    config: joi.object().required(),
-    mongoConfig: joi.object().required(),
+    config: OplogPopulatorConfigJoiSchema.keys({
+        maxRequestSize: joi.number().required(),
+    }).required(),
+    mongoConfig: mongoJoi.required(),
     activeExtensions: joi.array().required(),
     logger: joi.object().required(),
     enableMetrics: joi.boolean().default(true),
@@ -30,6 +34,7 @@ class OplogPopulator {
      * @constructor
      * @param {Object} params - constructor params
      * @param {Object} params.config - oplog populator config
+     * @param {Object} params.config.maxRequestSize - kafka producer's max request size
      * @param {Object} params.mongoConfig - mongo connection config
      * @param {Object} params.mongoConfig.authCredentials - mongo auth credentials
      * @param {Object} params.mongoConfig.replicaSetHosts - mongo replication hosts
@@ -259,7 +264,7 @@ class OplogPopulator {
                heartbeatIntervalMs: this._config.heartbeatIntervalMs,
                kafkaConnectHost: this._config.kafkaConnectHost,
                kafkaConnectPort: this._config.kafkaConnectPort,
-               kafkaMaxRequestSize: this._config.kafka.maxRequestSize,
+               kafkaMaxRequestSize: this._maxRequestSize,
                metricsHandler: this._metricsHandler,
                logger: this._logger,
             });
diff --git a/extensions/oplogPopulator/OplogPopulatorConfigValidator.js b/extensions/oplogPopulator/OplogPopulatorConfigValidator.js
index abd562ceca..2f96856188 100644
--- a/extensions/oplogPopulator/OplogPopulatorConfigValidator.js
+++ b/extensions/oplogPopulator/OplogPopulatorConfigValidator.js
@@ -17,4 +17,7 @@ function configValidator(backbeatConfig, extConfig) {
     return validatedConfig;
 }
 
-module.exports = configValidator;
+module.exports = {
+    OplogPopulatorConfigJoiSchema: joiSchema,
+    OplogPopulatorConfigValidator: configValidator
+};
diff --git a/extensions/oplogPopulator/OplogPopulatorTask.js b/extensions/oplogPopulator/OplogPopulatorTask.js
index 90c33ff896..6d3e513ca2 100644
--- a/extensions/oplogPopulator/OplogPopulatorTask.js
+++ b/extensions/oplogPopulator/OplogPopulatorTask.js
@@ -28,7 +28,10 @@ const activeExtensions = [
 ].filter(ext => config.extensions[ext]);
 
 const oplogPopulator = new OplogPopulator({
-    config: oplogPopulatorConfig,
+    config: {
+        ...oplogPopulatorConfig,
+        maxRequestSize: config.kafka.maxRequestSize,
+    },
     mongoConfig,
     activeExtensions,
     logger,
diff --git a/extensions/oplogPopulator/index.js b/extensions/oplogPopulator/index.js
index 79b2e0a15d..a7d95fda81 100644
--- a/extensions/oplogPopulator/index.js
+++ b/extensions/oplogPopulator/index.js
@@ -1,4 +1,4 @@
-const OplogPopulatorConfigValidator =
+const { OplogPopulatorConfigValidator } =
     require('./OplogPopulatorConfigValidator');
 
 module.exports = {
diff --git a/tests/unit/oplogPopulator/oplogPopulator.js b/tests/unit/oplogPopulator/oplogPopulator.js
index ff8364fbc5..a1d6422a7f 100644
--- a/tests/unit/oplogPopulator/oplogPopulator.js
+++ b/tests/unit/oplogPopulator/oplogPopulator.js
@@ -15,7 +15,10 @@ const ChangeStream =
 const oplogPopulatorConfig = {
     topic: 'oplog',
     kafkaConnectHost: '127.0.0.1',
-    kafkaConnectPort: 8083
+    kafkaConnectPort: 8083,
+    numberOfConnectors: 1,
+    probeServer: { port: 8552 },
+    maxRequestSize: 5000020,
 };
 
 const mongoConfig = {
@@ -90,6 +93,19 @@ describe('OplogPopulator', () => {
                 activeExtensions,
                 logger,
             }));
+            assert.throws(() => new OplogPopulator({
+                config: {
+                    topic: 'oplog',
+                    kafkaConnectHost: '127.0.0.1',
+                    kafkaConnectPort: 8083,
+                    numberOfConnectors: 1,
+                    probeServer: { port: 8552 },
+                },
+                mongoConfig,
+                activeExtensions,
+                enableMetrics: false,
+                logger,
+            }));
             const op = new OplogPopulator({
                 config: oplogPopulatorConfig,
                 mongoConfig,