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Cluster Links [WORK]

Each node in a Redis Cluster maintains a pair of long-lived TCP link with each peer in the cluster: One for sending outbound messages towards the peer and one for receiving inbound messages from the peer.

Cluster links

(a) Scheme depicting functional components of the gbu gene cluster in the overall transformation of γBB into TMA and crotonate. Proposed functions of the indicated genes were based both on sequence homology and bioinformatics, as well as combinatorial cloning and functional studies where analytes with m/z ratios appropriate for the predicted intermediates shown were detected in cell lysate. See Supplemental Results. (b) Multiple Amino Acid Sequence Alignment of 18 biochemically characterized acyl-CoA dehydrogenases to GbuA from two isolates of E. timonensis (SN18 and isolate 71.3) and Agathobaculum desmolans. Amino acidsare highlighted by level of conservation with residues highlighted yellow least conserved and those in blue mostconserved. Amino acids highlighted in green, red, and magenta highlight conserved residues responsible forpotential flavin adenine nucleotide (FAD) binding sites, a key acyl-CoA dehydrogenase active site glutamate,and carboxylate binding, respectively. The multiple sequence alignment was created using the EMBL Clustal Omega program ( ) and the resulting alignment was visualized andcolored-coded using the Jalview Desktop application ( ).

Cluster Linking enables you to directly connect clusters and mirrortopics from one cluster to another.Cluster Linking makes it easy to build multi-datacenter, multi-region,and hybrid cloud deployments. It is secure, performant, tolerant ofnetwork latency, and built into Confluent Server and Confluent Cloud.

Use Case: Easily create a persistent and seamless bridge from on-premise environmentsto cloud environments. A cluster link between a Confluent Platform cluster in your datacenter and a Confluent Cloudcluster in a public cloud acts as a single secure, scalable hybrid data bridge that can be usedby hundreds of topics, applications, and data systems. Cluster Linking can tolerate the high latencyand unpredictable networking availability that you might have between on-premise infrastructureand the cloud, and recovers from reconnections automatically. Cluster Linking can replicate databidirectionally between your datacenter and the cloud without any firewall holes or special IP filtersbecause your datacenter always makes an outbound connection. Cluster Linking creates a byte-for-byte,globally consistent copy of your data that preserves offsets, making it easy to migrate on-premise applicationsto the cloud. Cluster Linking built into Confluent Platform and does not require any additional components to manage.

Confluent proactively monitors all cluster links in Confluent Cloud and willperform tuning when necessary. If you find that your cluster link is not hittingthese limits even after a full day of sustained traffic, contact Confluent Support.

In version 9.6, the internal naming of channels and queues changed to support replication with DMR. Brokers older than version 9.6 cannot learn the new naming, so cluster links between a version 9.6 broker and an older broker will fail.

If you are upgrading brokers from version 9.5 or earlier that are part of a DMR network, do not add any new DMR cluster links anywhere in the network until all brokers in the network have been upgraded to version 9.6 or later. Links that existed before the upgrade will continue to function properly.

Cluster Linking on Confluent Cloud is a fully-managed service for replicating datafrom one Confluent cluster to another. Programmatically, it creates perfectcopies of your topics and keeps data in sync across clusters. Cluster Linking isa powerful geo-replication technology for:

Cluster Linking allows one Confluent cluster to mirror data directly fromanother. You can establish a cluster link between a source cluster and adestination cluster in a different region, cloud, line of business, ororganization. You choose which topics to replicate from the source cluster tothe destination. You can even mirror consumer offsets and ACLs, making itstraightforward to move Kafka consumers from one cluster to another.

From the left menu under Cluster overview for a dedicated cluster, click the Networking menu item to view the endpoint type.Only Dedicated clusters have the Networking tab; Basic and Standardclusters always have Internet networking. Networking is defined when you first create the Dedicated cluster.

Cluster Linking on Confluent Cloud is now in general availability. However, thefollowing included are being introduced in preview mode to gain early feedbackfrom developers. These metrics can be used for evaluation and non-productiontesting purposes or to provide feedback to Confluent. Comments, questions, andsuggestions related to preview features are encouraged and can be submitted

Create configuration files to store API keys and secrets, detailed configurations on cluster links,or security credentials for clusters external to Confluent Cloud. Examples of this are provided in(Usually Optional) Use a config File in the topic data sharing tutorial and in Create the cluster linkfor the disaster recovery tutorial.

You can streamline your command line workflows by saving permissions and cluster data in shell environment variables.Save API keys and secrets, resources such as IDs for environments, clusters, or service accounts, and bootstrap servers,then use the variables in Confluent commands.

If using Terraform to create and manage a cluster link, Terraform can onlycreate and manage cluster links that are between two Confluent Cloud clusters.It cannot create or manage cluster links to or from an external cluster, such as anopen-source Apache Kafka cluster or a Confluent Platform cluster.

Cluster Linking between a source cluster running Confluent Platform 7.0.x or earlier(non-KRaft) and a destination cluster running in KRaft mode is not supported.Link creation may succeed, but the connection will ultimately fail (with aSOURCE_UNAVAILABLE error message). To work around this issue, make sure thesource cluster is running Confluent Platform version 7.1.0 or later. If you have links from aConfluent Platform source cluster to a Confluent Cloud destination cluster, you must upgrade yoursource clusters to Confluent Platform 7.1.0 or later to avoid this issue.

Confluent Enterprise 7.0.0 includes a new feature called Cluster Linking that syncs dataand metadata from Confluent Platform, Confluent Cloud, or Kafka clusters to Confluent Platform and Confluent Cloud clusters.

Cluster links and mirror topics can be created and managed using either a REST APIin the Kafka REST v3 Proxy, or using CLI commands in a terminal.This section describes the commands for creating and managing cluster links and mirror topics.

Configuration options for the cluster links are available as valuesfor flags on the kafka-cluster-links command. Some of these optionsare shown below in the context of command examples. A full list is providedin reference form in Link Properties.

(Required) The connection string for the broker(s) in a cluster in the form host:port (which can be a comma-separated list for multiple brokers).You must specify the destination cluster where you plan to create mirror topics.The destination cluster must be running Confluent Platform 7.0.0 or later, which is required to support Cluster Linking.

(Required) One of the following parameters must be provided (not both) to specify how the destination clustershould communicate with the source. The available configurations are those that would be used to configure a client,including the required bootstrap.servers and other necessary security and authorization properties.

You can list existing cluster links. The command returns the link name, link ID(an internally allocated unique ID), the cluster ID of the linked cluster, and whetherthe linked cluster is available or not.

To confirm that your new configurations have been applied, use to pause and unpause the link to restart it.To learn more, see in Configuration Options for Cluster Linking.

To list mirror topics on a cluster across all cluster links, use kafka-mirrors --list. This commandcan either list the mirror topics for a specific cluster link, or can list all mirror topics across allcluster links on the cluster.

(Required) The connection string for the broker(s) in a cluster is in the form host:port (which can be a comma-separated list for multiple brokers).You must specify the destination cluster where you plan to create mirror topics.The destination cluster must be running Confluent Platform 6.0.0 or later, which is required to support Cluster Linking.

Enabling allows nodes to automatically rejoin the cluster after they have been fenced, minimizing the time the cluster is at less than full strength. If the cluster services are not enabled, an administrator can manually investigate what went wrong before starting the cluster services manually, so that, for example, a node with hardware issues in not allowed back into the cluster when it is likely to fail again.

This procedure adds standard clusters nodes running corosync. For information on integrating non-corosync nodes into a cluster, see Integrating non-corosync nodes into a cluster: the pacemaker_remote service.

It is recommended that you add nodes to existing clusters only during a production maintenance window. This allows you to perform appropriate resource and deployment testing for the new node and its fencing configuration.

Note that you cannot specify addresses that are currently in


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