Rahul ShishodiaSoftware Engineer with a passion for building scalable systems. Sharing my learnings, reference notes, and professional experiences.https://rahuls.net/High throughput SQS consumer using Spring Boothttps://rahuls.net/blog/sqs-max-throughput-spring-boothttps://rahuls.net/blog/sqs-max-throughput-spring-bootSpring Boot SQS consumer designed to process ~500 msg/sec under spike traffic by overlapping async batch receives, using CallerBlocksPolicy as backpressure, and insert-first Mongo writes keyed on content hashes.Sat, 11 Jul 2026 00:00:00 GMTSQL Server Deadlock on a Materialized View: Root Cause Analysis and Fixhttps://rahuls.net/blog/sql-server-materialized-view-deadlock-rcahttps://rahuls.net/blog/sql-server-materialized-view-deadlock-rcaA SQL Server deadlock on a materialized view looked like lock ordering. The real cause was a four-session lock conversion cycle, fixed with Snapshot Isolation in Grails.Thu, 09 Jul 2026 00:00:00 GMTMust use git repos for CKAD preparation:https://rahuls.net/feed/3mpqhpjxa7c2rhttps://rahuls.net/feed/3mpqhpjxa7c2rMust use git repos for CKAD preparation: - github.com/tariqm/CKAD-... - github.com/dgkanatsios/... - github.com/hitenpratap/...Fri, 03 Jul 2026 11:42:22 GMTEvery file upload feels simple until you build one properly. Great breakdown of what’s actually inv…https://rahuls.net/feed/3mpqfayqnqk2rhttps://rahuls.net/feed/3mpqfayqnqk2rEvery file upload feels simple until you build one properly. Great breakdown of what’s actually involved 👇 medium.com/@tahierhussa...Fri, 03 Jul 2026 10:58:27 GMTAutoscalinghttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/autoscalinghttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/autoscalingHorizontal Pod Autoscaler (HPA).Sat, 06 Jun 2026 00:00:00 GMTDeployment Strategieshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/deployment-strategieshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/deployment-strategiesRolling, Recreate, Blue-Green, and Canary strategies.Sat, 06 Jun 2026 00:00:00 GMTDeploymentshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/deploymentshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/deploymentsDeployments, ReplicaSets, rollouts, and HPA.Sat, 06 Jun 2026 00:00:00 GMTHelmhttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/helmhttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/helmConsuming Helm charts: repo, install, upgrade, uninstall.Sat, 06 Jun 2026 00:00:00 GMTKustomizehttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/kustomizehttps://rahuls.net/notes/certified-kubernetes-application-developer/application-deployment/kustomizeKustomize bases, overlays, patches, generators, and transformers.Sat, 06 Jun 2026 00:00:00 GMTContainershttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/containershttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/containersDefine, build, and modify container images; Docker commands and args.Sat, 06 Jun 2026 00:00:00 GMTCronJobshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/cronjobshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/cronjobsCron Jobs for scheduled work.Sat, 06 Jun 2026 00:00:00 GMTDaemonSetshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/daemonsetshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/daemonsetsRun one Pod per node.Sat, 06 Jun 2026 00:00:00 GMTJobshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/jobshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/jobsJobs for batch work.Sat, 06 Jun 2026 00:00:00 GMTMulti-Container Podshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/multi-container-podshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/multi-container-podsInit, sidecar, adapter, and ambassador patterns.Sat, 06 Jun 2026 00:00:00 GMTPods and Namespaceshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/pods-and-namespaceshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/pods-and-namespacesPods, configuration, namespaces, and kubectl interaction.Sat, 06 Jun 2026 00:00:00 GMTTaints, Tolerations, and Node Affinityhttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/taints-tolerations-affinityhttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/taints-tolerations-affinityHow taints repel Pods, tolerations allow them, and node affinity attracts them, with CKAD gotchas.Sat, 06 Jun 2026 00:00:00 GMTVolumeshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/volumeshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/volumesEphemeral and persistent volumes, PVCs, and StorageClasses.Sat, 06 Jun 2026 00:00:00 GMTAuthentication, Authorization, and Admission Controlhttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/auth-rbac-admissionhttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/auth-rbac-admissionKubeconfig, RBAC, service accounts, and admission control.Sat, 06 Jun 2026 00:00:00 GMTConfigMaps and Secretshttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/configmaps-and-secretshttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/configmaps-and-secretsConfigMaps, Secrets, imagePullSecrets, and consumption patterns.Sat, 06 Jun 2026 00:00:00 GMTCustomResourceDefinitions (CRDs)https://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/crdshttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/crdsCRDs and custom resources.Sat, 06 Jun 2026 00:00:00 GMTResource Requirements, Limits, and Quotashttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/resource-requirementshttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/resource-requirementsRequests, limits, ResourceQuotas, and LimitRanges.Sat, 06 Jun 2026 00:00:00 GMTSecurity Contextshttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/security-contextshttps://rahuls.net/notes/certified-kubernetes-application-developer/configuration-security/security-contextsPod- and container-level security contexts.Sat, 06 Jun 2026 00:00:00 GMTDocker vs containerdhttps://rahuls.net/notes/certified-kubernetes-application-developer/core-concepts/docker-vs-containerdhttps://rahuls.net/notes/certified-kubernetes-application-developer/core-concepts/docker-vs-containerdCRI runtimes, the Docker removal in K8s 1.24, and when to use docker, nerdctl, ctr, or crictl.Sat, 06 Jun 2026 00:00:00 GMTNodes and Clustershttps://rahuls.net/notes/certified-kubernetes-application-developer/core-concepts/nodes-and-clustershttps://rahuls.net/notes/certified-kubernetes-application-developer/core-concepts/nodes-and-clustersNodes, clusters, control plane vs worker roles, node conditions, and scheduling/networking gotchas.Sat, 06 Jun 2026 00:00:00 GMTCKAD Exam Tips and kubectl Aliaseshttps://rahuls.net/notes/certified-kubernetes-application-developer/exam-practice/ckad-exam-tipshttps://rahuls.net/notes/certified-kubernetes-application-developer/exam-practice/ckad-exam-tipsCKAD session setup, kill sheet, time management, and vim shortcuts for the hands-on exam.Sat, 06 Jun 2026 00:00:00 GMTYAML Manifest Referencehttps://rahuls.net/notes/certified-kubernetes-application-developer/exam-practice/yaml-manifesthttps://rahuls.net/notes/certified-kubernetes-application-developer/exam-practice/yaml-manifestQuick-copy YAML templates for common CKAD exam resources.Sat, 06 Jun 2026 00:00:00 GMTAPI Deprecationshttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/api-deprecationshttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/api-deprecationsDeprecated and removed APIs when upgrading clusters.Sat, 06 Jun 2026 00:00:00 GMTCommon Exam Mistakeshttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/common-mistakeshttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/common-mistakesFrequent CKAD errors: YAML validation, command typos, and pod replacement patterns.Sat, 06 Jun 2026 00:00:00 GMTContainer Probeshttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/container-probeshttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/container-probesReadiness, liveness, and startup probes.Sat, 06 Jun 2026 00:00:00 GMTTroubleshooting Pods and Containershttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/troubleshootinghttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/troubleshootingDebugging, logs, exec, port-forward, ephemeral containers, and metrics.Sat, 06 Jun 2026 00:00:00 GMTIngresseshttps://rahuls.net/notes/certified-kubernetes-application-developer/services-and-networking/ingresshttps://rahuls.net/notes/certified-kubernetes-application-developer/services-and-networking/ingressIngress controllers, rules, and troubleshooting.Sat, 06 Jun 2026 00:00:00 GMTNetwork Policieshttps://rahuls.net/notes/certified-kubernetes-application-developer/services-and-networking/network-policieshttps://rahuls.net/notes/certified-kubernetes-application-developer/services-and-networking/network-policiesIngress/egress rules, selectors, ipBlock, and default deny.Sat, 06 Jun 2026 00:00:00 GMTServiceshttps://rahuls.net/notes/certified-kubernetes-application-developer/services-and-networking/serviceshttps://rahuls.net/notes/certified-kubernetes-application-developer/services-and-networking/servicesClusterIP, NodePort, LoadBalancer, ExternalName, and service discovery.Sat, 06 Jun 2026 00:00:00 GMTDownward APIhttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/downward-apihttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/downward-apiExpose pod metadata to containers via env vars and downwardAPI volumes.Fri, 05 Jun 2026 00:00:00 GMTLabels and Annotationshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/labels-and-annotationshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/labels-and-annotationsLabels, selectors, and annotations.Fri, 05 Jun 2026 00:00:00 GMTStatefulSets and Headless Serviceshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/statefulsets-and-headless-serviceshttps://rahuls.net/notes/certified-kubernetes-application-developer/application-design-and-build/statefulsets-and-headless-servicesStateful workloads, headless Services, and update strategies.Fri, 05 Jun 2026 00:00:00 GMTKubernetes Control Plane and Node Componentshttps://rahuls.net/notes/certified-kubernetes-application-developer/core-concepts/kubernetes-componentshttps://rahuls.net/notes/certified-kubernetes-application-developer/core-concepts/kubernetes-componentsControl plane (API server, etcd, controller manager, scheduler) and node (kubelet, kube-proxy, runtime) roles.Fri, 05 Jun 2026 00:00:00 GMTkubectl debug and kubectl cphttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/kubectl-debug-and-cphttps://rahuls.net/notes/certified-kubernetes-application-developer/observability-and-maintenance/kubectl-debug-and-cpEphemeral containers for debugging and file copy to/from pods.Fri, 05 Jun 2026 00:00:00 GMTKubectl cheatsheethttps://rahuls.net/notes/certified-kubernetes-application-developer/exam-practice/kubectl-cheatsheethttps://rahuls.net/notes/certified-kubernetes-application-developer/exam-practice/kubectl-cheatsheetFast kubectl reference: session setup, YAML generation, resource short names, and debug one-liners.Sun, 31 May 2026 00:00:00 GMT