Event streaming enables businesses to capture massive volumes of real-time data. However, capturing and processing this data requires more than just a platform.
Enterprises often have large IT teams that can support building a solution in-house, but SMBs often need help finding the time and resources for a fully functional event-streaming platform.
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Persistent Volume Claim
A persistent volume claim is an object a deployment can use to request storage resources. It is a container-specific abstraction that links the workloads with the physical storage. It is similar to a voucher that your deployment can redeem for access to storage resources in your cluster. The PersistentVolumeClaim is also linked to a StorageClass, which is the resource that provides the actual backing storage. Its default StorageClass is a balanced persistent disk Container Storage Interface (CSI) driver, which can be changed to a custom one using the StorageClassEditor command.
The YAML configuration file for PersistentVolumeClaim specifies the plugin type, access modes, and reclaim policy. It also sets the maximum storage size and the number of replicas it can create. The default reclaim policy is Retain, but you can change it to Delete to automatically remove the PV and make the space available for another claim.
It is essential to monitor your persistent storage and persistent volume claims, especially in a production environment. Open-source tools can help you track your storage. In addition, it is a good idea to back up your data. Various open-source tools can automate persistent volume backups and ensure your data is safe.
Persistent Volume Scheduler
The world’s most popular websites generate millions of event messages per second supporting user activity. This massive volume of data requires a high-scale message queue (MQ) framework like Kafka on Kubernetes for processing. Organizations need a platform to handle these large data streams, which are compiled into event logs for actionable insights. Moreover, this platform should provide event-based database storage to maximize performance and reduce costs.
A persistent volume (PV) is a cluster resource that contains a set of disks or partitions backed by a storage system. An administrator can statically provision PVs or dynamically provision them with Storage Classes. They can also be mounted using different access modes: ReadWriteOnce by a single pod or ReadOnlyMany by many pods.
When a Pod uses a PersistentVolumeClaim, the cluster inspects the claim to find a PV that satisfies its storage requirements and then binds it to the PV. The pod can then mount the PV to access the underlying disks.
When the underlying file system on a PV is resized, a new PVC will be created that reflects the updated size. The PVC will also contain the condition FileSystemResizePending to indicate that a pod must be restarted to finish expanding the file system on the node. After the pod restarts, the PVC will reflect the new size and no longer display the FileSystemResizePending condition.
No Volume Zone
Complex event-streaming architectures generate massive volumes of real-time data from diverse sources. These events can be recorded in persistent or temporary storage systems. Event stream platforms are designed to capture, synchronize, and transform these data streams. They support various uses, from monitoring and alerting to training machine learning models for predictive analytics and deploying event-driven products.
Persistent Volume (PV) in Kubernetes is a unique storage system that provides long-term, persistent, and durable storage for the data produced by applications running on a cluster. The system administers the PVs. PVs can be created in different storage classes with various disk and access modes. The cluster administrator can map these storage classes to backend policies. When a pod requests a PersistentVolume, the controller binds a volume from one of the available storage classes.
The capacity of a persistent volume is set by its storage class. If a PersistentVolumeClaim requests a higher capacity than the current storage class, the cluster may not be able to fulfill its request. This can occur when the cluster’s nodes do not have enough space to hold all the data associated with a pod’s PersistentVolumeClaim. The solution is to reduce the PersistentVolumeClaim’s request or upgrade the node’s capacity.
Persistent Volume Controller
Event streaming is a data management solution that allows businesses to provide real-time results and actionable insights. This type of data processing enables businesses to meet the customer expectations that drive their business model. It allows businesses to quickly deliver personalized content and improve the quality of their services. This heightened customer experience is crucial for success in a competitive marketplace.
Persistent volume is a Kubernetes API resource that provides a persistent pod storage layer. It supports applications with unique volume requirements, such as stateful sets that require a unique persistent volume for each replica. This storage architecture enables application scaling to infinitely-scalable numbers of replicas.
A PersistentVolumeController is responsible for binding PersistentVolumeClaims to persistent volumes. This process occurs independently of the scheduler and can cause scheduling failures if the PersistentVolumeController does not match all criteria for volume matching, including node affinity.
A PersistentVolumeController can be upgraded by editing its local yaml file containing the PVC and claimPolicy information. The resulting upgrade will trigger the volume expansion that backs the PersistentVolume. When this happens, the PVC will be renamed, and the storage class will be changed to a new type. This will ensure that other PVCs cannot bind to the same PV.