Problem: The client has encountered an issue where a label, specifically “app_kubernetes_io_part_of”, is not being evaluated in the alert description or labels despite being present in the metric. They seek clarification on whether this behavior aligns with the expected functionality of Prometheus alerts. Process: The client provided a Prometheus rule with an alert definition that […]
Data Analytics 25 Apr 2024 Clarification Needed: Understanding Cassandra Replication Factor (RF) in Multi-Data Center ConfigurationsProblem: The issue stems from confusion surrounding the Replication Factor (RF) in Apache Cassandra, where the documentation implies RF determines the quantity of data copies, but clarity on this matter is lacking. Process: To address this issue, in-depth investigation took place. The team explored the information provided by the client: Cassandra Configurations: Cassandra Version: 4.0.1 […]
Database 24 Apr 2024 Resolving PostgreSQL Replication Alert DiscrepanciesProblem: The system is generating alerts indicating replication lag on the “productCatalog” PostgreSQL instance, specifically targeting the machine “pa3fnd02.” However, upon DBA investigation, there is no observable lag in the cluster, with both the leader (pa3fnd02) and the sync standby (pa3fnd01) reporting no lag. The discrepancy raises concerns about the persistence of alerts despite the […]
Database 23 Apr 2024 Capturing Logout Events in Cassandra 4.0.x Audit LogsProblem: The organization is using Cassandra 4.0.x in its Production environment and requires tracking login and logout details from the Cassandra Audit logs. However, the Audit logs only record LOGIN_SUCCESS, LOGIN_ERROR, and UNAUTHORIZED_ATTEMPT events, with no mention of LOGOUT events. The organization seeks clarification on mechanisms for capturing logout-related entries. Solution: Cassandra does not inherently […]
Database 22 Apr 2024 Ceph Storage Capacity Issue: OSDs Limited Space Despite Expected AvailabilityProblem: Ceph Storage Almost Full but Should Have Space. The client reported that the Ceph storage is nearly full, even though there should be sufficient space available. The output of ceph osd status indicates that some OSDs have limited available space. The most common cause identified is not deleting the lost+found directory after a crash […]
Storage 22 Apr 2024 Resolving High CPU Utilization Issue on RHEL 7.5 Nexus ServerProblem: The client reported sudden high CPU utilization on their RHEL 7.5 Nexus server. Despite disabling tasks and restarting the server, the issue persisted. Logs indicated that the Nexus process was the top contributor to CPU utilization. Process: Steps and measures undertaken to investigate the issue: Requesting Information: Furnished JVM logs, Nexus application logs, and […]
Developer Tools 21 Apr 2024 Understanding Logstash Pipeline Configuration: Query and Schedule ParametersProblem: Need Explanation for the Pipeline: Our client has encountered a scenario in their Elasticsearch setup that requires clarification and understanding. The specific concern revolves around the configuration of the Logstash pipeline, more precisely, the interaction between the defined schedule and query parameters. Logstash Configuration LogstashConfig: pipelines.yml: | - pipeline.id: logstash-output-broker schedule: "*/5 * * […]
Data Analytics 21 Apr 2024 Resolving Slow Startup and Readiness Probe Failure in Prometheus PodsProblem: The client’s Prometheus pod, despite having substantial memory resources, is experiencing prolonged startup times, likely due to extended WAL (Write-Ahead Logging) loading durations. This delay leads to readiness probe failures and leaves the pod in a failed state. The client seeks a resolution to mitigate this performance issue and ensure prompt pod initialization. Solution: […]
Data Analytics 20 Apr 2024 Handling DDL Changes and Replication Issues in Multi-DC Cassandra SetupProblem: The client operates a 6-node multi-DC replication setup for Cassandra, consisting of 3 nodes in the PROD datacenter (East US2) and 3 nodes in the DR datacenter (West US2). They are planning to perform DDL changes, including altering tables to adjust the default_time_to_live parameter and dropping and recreating a table with a new definition. […]
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