Cloud Computing

Introducing Amazon MSK Replicator – Absolutely Managed Replication throughout MSK Clusters in Similar or Totally different AWS Areas

Amazon Managed Streaming for Apache Kafka (Amazon MSK) supplies a totally managed and extremely out there Apache Kafka service simplifying the best way you course of streaming information. When utilizing Apache Kafka, a typical architectural sample is to copy information from one cluster to a different.

Cross-cluster replication is commonly used to implement enterprise continuity and catastrophe restoration plans and enhance software resilience throughout AWS Areas. One other use case, when constructing multi-Area purposes, is to have copies of streaming information in a number of geographies saved nearer to finish customers for decrease latency entry. You may additionally have to mixture information from a number of clusters into one centralized cluster for analytics.

To handle these wants, you would need to write customized code or set up and handle open-source instruments like MirrorMaker 2.0, out there as a part of Apache Kafka beginning with model 2.4. Nonetheless, these instruments will be complicated and time-consuming to arrange for dependable replication, and require steady monitoring and scaling.

At present, we’re introducing MSK Replicator, a brand new functionality of Amazon MSK that makes it simpler to reliably arrange cross-Area and same-Area replication between MSK clusters, scaling mechanically to deal with your workload. You should use MSK Replicator with each provisioned and serverless MSK cluster sorts, together with these utilizing tiered storage.

With MSK Replicator, you may setup each active-passive and active-active cluster topologies to extend the resiliency of your Kafka software throughout Areas:

  • In an active-active setup, each MSK clusters are actively serving reads and writes.
  • In an active-passive setup, just one MSK cluster at a time is actively serving streaming information whereas the opposite cluster is on standby.

Let’s see how that works in follow.

Creating an MSK Replicator throughout AWS Areas
I’ve two MSK clusters deployed in numerous Areas. MSK Replicator requires that the clusters have IAM authentication enabled. I can proceed to make use of different authentication strategies reminiscent of mTLS or SASL for my different shoppers. The supply cluster additionally must allow multi-VPC personal connectivity.

MSK Replicator cross-Region architecture diagram.

From a community perspective, the safety teams of the clusters enable site visitors between the cluster and the safety group utilized by the Replicator. For instance, I can add self-referencing inbound and outbound guidelines that enable site visitors from and to the identical safety group. For simplicity, I take advantage of the default VPC and its default safety group for each clusters.

Earlier than making a replicator, I replace the cluster coverage of the supply cluster to permit the MSK service (together with replicators) to seek out and attain the cluster. Within the Amazon MSK console, I choose the supply Area. I select Clusters from the navigation pane after which the supply cluster. First, I copy the supply cluster ARN on the high. Then, within the Properties tab, I select Edit cluster coverage within the Safety settings. There, I take advantage of the next JSON coverage (changing the supply cluster ARN) and save the adjustments:

    "Model": "2012-10-17",
    "Assertion": [
            "Effect": "Allow",
            "Principal": {
                "Service": ""
            "Action": [
            "Useful resource": "<SOURCE_CLUSTER_ARN>"

I choose the goal Area within the console. I select Replicators from the navigation pane after which Create replicator. Right here, I enter a reputation and an outline for the replicator.

Console screenshot.

Within the Supply cluster part, I choose the Area of the supply MSK cluster. Then, I select Browse to pick the supply MSK cluster from the checklist. Be aware that Replicators will be created just for clusters which have a cluster coverage set.

Console screenshot.

I go away Subnets and Safety teams as their default values to make use of my default VPC and its default safety group. This community configuration could also be used to put elastic community interfaces (EINs) to facilitate communication along with your cluster.

The Entry management methodology for the supply cluster is ready to IAM role-based authentication. Optionally, I can activate a number of authentication strategies on the identical time to proceed to make use of shoppers that want different authentication strategies like mTLS or SASL whereas the Replicator makes use of IAM. For cross-Area replication, the supply cluster can not have unauthenticated entry enabled, as a result of we use multi-VPC to entry their supply cluster.

Console screenshot.

Within the Goal cluster part, the Cluster area is ready to the Area the place I’m utilizing the console. I select Browse to pick the goal MSK cluster from the checklist.

Console screenshot.

Much like what I did for the supply cluster, I go away Subnets and Safety teams as their default values. This community configuration is used to put the ENIs required to speak with the goal cluster. The Entry management methodology for the goal cluster can be set to IAM role-based authentication.

Console screenshot.

Within the Replicator settings part, I take advantage of the default Matter replication configuration, so that each one subjects are replicated. Optionally, I can specify a comma-separated checklist of normal expressions that point out the names of the subjects to copy or to exclude from replication. Within the Further settings, I can select to repeat subjects configurations, entry management lists (ACLs), and to detect and replica new subjects.

Console screenshot.

Shopper group replication permits me to specify if client group offsets must be replicated in order that, after a switchover, consuming purposes can resume processing close to the place they left off within the major cluster. I can specify a comma-separated checklist of normal expressions that point out the names of the buyer teams to copy or to exclude from replication. I can even select to detect and replica new client teams. I take advantage of the default settings that replicate all client teams.

Console screenshot.

In Compression, I choose None from the checklist of accessible compression sorts for the info that’s being replicated.

Console screenshot.

The Amazon MSK console can mechanically create a service execution function with the mandatory permissions required for the Replicator to work. The function is utilized by the MSK service to hook up with the supply and goal clusters, to learn from the supply cluster, and to put in writing to the goal cluster. Nonetheless, I can select to create and supply my very own function as nicely. In Entry permissions, I select Create or replace IAM function.

Console screenshot.

Lastly, I add tags to the replicator. I can use tags to look and filter my sources or to trace my prices. Within the Replicator tags part, I enter Surroundings as the important thing and AWS Information Weblog as the worth. Then, I select Create.

Console screenshot.

After a couple of minutes, the replicator is operating. Let’s put it into use!

Testing an MSK Replicator throughout AWS Areas
To hook up with the supply and goal clusters, I already arrange two Amazon Elastic Compute Cloud (Amazon EC2) situations within the two Areas. I adopted the directions within the MSK documentation to put in the Apache Kafka consumer instruments. As a result of I’m utilizing IAM authentication, the 2 situations have an IAM function connected that enables them to attach, ship, and obtain information from the clusters. To simplify networking, I used the default safety group for the EC2 situations and the MSK clusters.

First, I create a brand new matter within the supply cluster and ship a number of messages. I take advantage of Amazon EC2 Occasion Join to log into the EC2 occasion within the supply Area. I modify the listing to the trail the place the Kafka consumer executables have been put in (the trail is determined by the model you utilize):

cd /house/ec2-user/kafka_2.12-2.8.1/bin

To hook up with the supply cluster, I have to know its bootstrap servers. Utilizing the MSK console within the supply Area, I select Clusters from the navigation web page after which the supply cluster from the checklist. Within the Cluster abstract part, I select View consumer data. There, I copy the checklist of Bootstrap servers. As a result of the EC2 occasion is in the identical VPC because the cluster, I copy the checklist within the Personal endpoint (single-VPC) column.

Console screenshot.

Again to the EC2 occasion, I put the checklist of bootstrap servers within the SOURCE_BOOTSTRAP_SERVERS surroundings variable.


Now, I create a subject on the supply cluster.

./ --bootstrap-server $SOURCE_BOOTSTRAP_SERVERS --command-config --create --topic my-topic --partitions 6

Utilizing the brand new matter, I ship a number of messages to the supply cluster.

./ --broker-list $SOURCE_BOOTSTRAP_SERVERS --producer.config --topic my-topic
>Hey from the US
>These are my messages

Let’s see what occurs within the goal cluster. I hook up with the EC2 occasion within the goal Area. Much like what I did for the opposite occasion, I get the checklist of bootstrap servers for the goal cluster and put it into the TARGET_BOOTSTRAP_SERVERS surroundings variable.

On the goal cluster, the supply cluster alias is added as a prefix to the replicated matter names. To seek out the supply cluster alias, I select Replicators within the MSK console navigation pane. There, I select the replicator I simply created. Within the Properties tab, I lookup the Cluster alias within the Supply cluster part.

Console screenshot.

I affirm the identify of the replicated matter by wanting on the checklist of subjects within the goal cluster (it’s the final one within the output checklist):

./ --list --bootstrap-server $TARGET_BOOTSTRAP_SERVERS --command-config
. . .

Now that I do know the identify of the replicated matter on the goal cluster, I begin a client to obtain the messages initially despatched to the supply cluster:

./ --bootstrap-server $TARGET_BOOTSTRAP_SERVERS --consumer.config --topic --from-beginning
Hey from the US
These are my messages

Be aware that I can use a wildcard within the matter subscription (for instance, .*my-topic) to mechanically deal with the prefix and have the identical configuration within the supply and goal clusters.

As anticipated, all of the messages I despatched to the supply cluster have been replicated and acquired by the buyer linked to the goal cluster.

I can monitor the MSK Replicator latency, throughput, errors, and lag metrics utilizing the Monitoring tab. As a result of this works by means of Amazon CloudWatch, I can simply create my very own alarms and embrace these metrics in my dashboards.

To replace the configuration to an active-active setup, I comply with related steps to create a replicator within the different Area and replicate streaming information between the clusters within the different course. For particulars on how one can handle failover and failback, see the MSK Replicator documentation.

Availability and Pricing
MSK Replicator is out there at the moment in: US East (Ohio), US East (N. Virginia), US West (Oregon), Asia Pacific (Singapore), Asia Pacific (Sydney), Europe (Frankfurt), and Europe (Eire).

With MSK Replicator, you pay per GB of information replicated and an hourly charge for every Replicator. You additionally pay Amazon MSK’s typical fees in your supply and goal MSK clusters and commonplace AWS fees for cross-Area information switch. For extra data, see MSK pricing.

Utilizing MSK replicators, you may shortly implement cross-Area and same-Area replication to enhance the resiliency of your structure and retailer information near your companions and finish customers. You too can use this new functionality to get higher insights by replicating streaming information to a single, centralized cluster the place it’s simpler to run your analytics.

Simplify your information streaming architectures utilizing Amazon MSK Replicator.



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