Quick study sessions to strengthen memory and retain key concepts.
How does the G1 Garbage Collector differ from ZGC?
G1GC aims for predictable pause times; ZGC targets low-latency. G1GC divides the heap into regions and collects them…
View Card →What role does the Metaspace play in the JVM?
Metaspace stores class metadata in native memory. Unlike PermGen, Metaspace is allocated from native memory, which helps prevent…
View Card →How do generational garbage collectors manage memory?
They separate memory into Young and Old generations. Generational collectors optimize GC by focusing on the Young generation…
View Card →Why are thread states like BLOCKED important in diagnostics?
Thread states help identify resource contention or deadlocks. BLOCKED threads indicate waiting on a lock or monitor. For…
View Card →Why does a thread dump matter in practice?
A thread dump provides a snapshot of all live threads in a JVM. Thread dumps are crucial for…
View Card →What does it usually mean if many threads are stuck at `HikariPool.getConnection()`?
The service is likely waiting on database pool capacity or a slow database. This kind of stack trace…
View Card →What does a thread dump answer best?
What threads are doing right now: running, blocked, waiting, or spinning. Thread dumps are the right artifact for…
View Card →Why do 'Stop-The-World' pauses affect HTTP requests?
They freeze application threads, delaying request processing. When a 'Stop-The-World' pause occurs, all application threads are halted, which…
View Card →How does G1GC differ from traditional collectors?
It collects garbage incrementally by heap regions. Unlike traditional garbage collectors that often require a full heap collection,…
View Card →Why does a heap dump matter in practice?
To analyze the JVM's memory usage. Frame the concept in practical terms so you can explain it during…
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