YARN ResourceManager HA Failover Not Working: A Diagnostic Guide
Diagnostic steps for YARN ResourceManager HA failover failures covering ZooKeeper leader election, JournalNode sync, and HA configuration checks with verification commands.
Loading…
ReadMeFeed / Community knowledge
#resource-manager
Real questions. Useful conversations. Find the people who know your stack.
yarn
Rapid Tenant On‑boarding with Oracle Multitenant: Provisioning, Isolation, and Management
Learn how to use CDB/PDB architecture to spin up a new SaaS tenant in seconds, isolate workloads with Resource Manager, and keep patches uniform across all tenants.
Yarn ResourceManager High Availability: Minimal Design and Operational Checks
A concise architecture note covering Yarn ResourceManager HA requirements, minimal two‑node design, trust boundaries, operational verification steps, typical failure modes, and when the design would need to change.
Missing ARIA labels and inconsistent focus order in YARN ResourceManager UI
The ResourceManager web UI should be usable with screen readers and keyboard-only navigation, but current observations show missing ARIA labels on controls like the Kill Application button and queue selection dropdown, and an irregular tab order that can skip metrics tables. These gaps persist despite community proposals to add ARIA roles, labels, and live r
What default memory-overutilization threshold should YARN administrators use for alerts?
Administrators want to set up YARN Resource Manager alerts that flag container memory over‑utilization promptly while avoiding excessive notifications during normal workload spikes. The YARN Metrics2 subsystem reports container memory usage, but the documentation does not prescribe a universal default threshold; different Hadoop distributions use values rang
Oracle JDBC Thin Driver ↔ Database Resource Manager: Cancellation and Timeout Interoperability
Integrating the Oracle JDBC Thin driver with the database Resource Manager requires a clear understanding of how session termination is handled when multiple timeout mechanisms overlap. Specifically, the JDBC driver provides setQueryTimeout and the cancel() method to signal the server to abort execution via a break message. Simultaneously, the Oracle Databas