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

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Amazon Managed Streaming for Apache Kafka (Amazon MSK) supplies a completely managed and extremely out there Apache Kafka service simplifying the way in which you course of streaming information. When utilizing Apache Kafka, a standard architectural sample is to duplicate 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 shoppers for decrease latency entry. You may additionally must mixture information from a number of clusters into one centralized cluster for analytics.

To deal with 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. Nevertheless, these instruments could be advanced and time-consuming to arrange for dependable replication, and require steady monitoring and scaling.

As we speak, 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 robotically 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’ll be able to 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 observe.

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 akin to mTLS or SASL for my different shoppers. The supply cluster additionally must allow multi-VPC non-public connectivity.

MSK Replicator cross-Region architecture diagram.

From a community perspective, the safety teams of the clusters permit 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 permit 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 modifications:

    "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 out the supply MSK cluster from the checklist. Word that Replicators could 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 position elastic community interfaces (EINs) to facilitate communication along with your cluster.

The Entry management technique for the supply cluster is about 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 about to the Area the place I’m utilizing the console. I select Browse to pick out 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 position the ENIs required to speak with the goal cluster. The Entry management technique for the goal cluster can also be set to IAM role-based authentication.

Console screenshot.

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

Console screenshot.

Shopper group replication permits me to specify if shopper 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 main cluster. I can specify a comma-separated checklist of standard expressions that point out the names of the patron teams to duplicate or to exclude from replication. I may select to detect and duplicate new shopper teams. I take advantage of the default settings that replicate all shopper teams.

Console screenshot.

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

Console screenshot.

The Amazon MSK console can robotically create a service execution position with the required permissions required for the Replicator to work. The position is utilized by the MSK service to connect with the supply and goal clusters, to learn from the supply cluster, and to write down to the goal cluster. Nevertheless, I can select to create and supply my very own position as properly. In Entry permissions, I select Create or replace IAM position.

Console screenshot.

Lastly, I add tags to the replicator. I can use tags to look and filter my assets or to trace my prices. Within the Replicator tags part, I enter Atmosphere 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) cases within the two Areas. I adopted the directions within the MSK documentation to put in the Apache Kafka shopper instruments. As a result of I’m utilizing IAM authentication, the 2 cases have an IAM position hooked up that enables them to attach, ship, and obtain information from the clusters. To simplify networking, I used the default safety group for the EC2 cases and the MSK clusters.

First, I create a brand new matter within the supply cluster and ship a couple 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 shopper executables have been put in (the trail depends upon the model you employ):

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

To hook up with the supply cluster, I must 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 shopper 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 Non-public endpoint (single-VPC) column.

Console screenshot.

Again to the EC2 occasion, I put the checklist of bootstrap servers within the SOURCE_BOOTSTRAP_SERVERS setting 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 couple of messages to the supply cluster.

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

Let’s see what occurs within the goal cluster. I connect 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 setting variable.

On the goal cluster, the supply cluster alias is added as a prefix to the replicated matter names. To search 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 search for the Cluster alias within the Supply cluster part.

Console screenshot.

I verify the identify of the replicated matter by trying 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 shopper to obtain the messages initially despatched to the supply cluster:

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

Word that I can use a wildcard within the matter subscription (for instance, .*my-topic) to robotically 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 patron related 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 comparable steps to create a replicator within the different Area and replicate streaming information between the clusters within the different route. For particulars on methods to handle failover and failback, see the MSK Replicator documentation.

Availability and Pricing
MSK Replicator is out there in the present day 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 knowledge replicated and an hourly price for every Replicator. You additionally pay Amazon MSK’s typical fees on 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’ll be able to 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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