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Make AccumulatingStagingArea Thread Safe #2288

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Merged
laurit merged 2 commits into from
Apr 25, 2025
Merged

Make AccumulatingStagingArea Thread Safe #2288

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816d5ad
Store stack traces in a thread-safe queue in AccumulatingStagingArea.
tduncan Apr 23, 2025
2e34875
change type from List to Collection to avoid having to copy the Queue…
laurit Apr 25, 2025
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11 changes: 6 additions & 5 deletions ...ler/src/main/java/com/splunk/opentelemetry/profiler/snapshot/AccumulatingStagingArea.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,13 +17,14 @@
package com.splunk.opentelemetry.profiler.snapshot;

import java.util.ArrayList;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentMap;
import java.util.function.Supplier;

class AccumulatingStagingArea implements StagingArea {
private final ConcurrentMap<String, List<StackTrace>> stackTraces = new ConcurrentHashMap<>();
private final ConcurrentMap<String, Queue<StackTrace>> stackTraces = new ConcurrentHashMap<>();
private final Supplier<StackTraceExporter> exporter;

AccumulatingStagingArea(Supplier<StackTraceExporter> exporter) {
Expand All @@ -36,7 +37,7 @@ public void stage(String traceId, StackTrace stackTrace) {
traceId,
(id, stackTraces) -> {
if (stackTraces == null) {
stackTraces = new ArrayList<>();
stackTraces = new ConcurrentLinkedQueue<>();
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@laurit laurit Apr 24, 2025

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When empty is called before the last stage from the schedule then you will end up leaking a map entry.

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@tduncan tduncan Apr 24, 2025

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@laurit yes, though not a thread-safety issue and not introduced by this PR.

}
stackTraces.add(stackTrace);
return stackTraces;
Expand All @@ -45,9 +46,9 @@ public void stage(String traceId, StackTrace stackTrace) {

@Override
public void empty(String traceId) {
List<StackTrace> stackTraces = this.stackTraces.remove(traceId);
Queue<StackTrace> stackTraces = this.stackTraces.remove(traceId);
if (stackTraces != null) {
exporter.get().export(stackTraces);
exporter.get().export(new ArrayList<>(stackTraces));
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@laurit laurit Apr 24, 2025

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if you made the StackTraceExporter accept a Collection than you could skip the copy.

}
}
}