Why it matters

Systematic troubleshooting beats guessing. Understanding common issues speeds resolution.

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The architecture

Slow query: check profile + plan.

OOM: raise mem_limit or reduce query complexity.

Stale metadata: INVALIDATE/REFRESH.

Common Impala issuesSlow queryprofile + planOOMmemory sizingMetadata stalenessINVALIDATE/REFRESHQuery profile shows per-operator time + memory; invaluable for tuning
Common fixes.
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How it works end to end

Query profile: PROFILE keyword after query. Shows execution details.

Missing statistics: COMPUTE STATS.

Admission control: waits for slot.

Runtime filters: might not fire.