Deadlock and JVM Troubleshooting | Dataford Interview Questions

Describe your experience troubleshooting JVM issues.

For this hands-on exercise, implement a detector that scans JVM metric samples and reports issue types that occur in at least two consecutive samples. Each sample contains heap_used, heap_max, gc_pause_ms, and thread_count.

Return [issue_name, start_index] pairs for the first qualifying run of each issue, ordered by index and then issue name. Use these thresholds: heap usage at least 90%, GC pause at least 500 ms, and thread count at least 1,000.

Constraints

2 <= len(samples) <= 10^4
0 <= heap_used <= heap_max
heap_max > 0
0 <= gc_pause_ms
0 <= thread_count
An issue requires at least two consecutive qualifying samples

Function Signature

def detect_jvm_issues(samples):

Your question is Deadlock and JVM Troubleshooting. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Describe your experience troubleshooting JVM issues.

Constraints

2 <= len(samples) <= 10^4
0 <= heap_used <= heap_max
heap_max > 0
0 <= gc_pause_ms
0 <= thread_count
An issue requires at least two consecutive qualifying samples

Function Signature

def detect_jvm_issues(samples):

Your question is Deadlock and JVM Troubleshooting. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.