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Type: Bug
Resolution: Fixed
Priority: P3
Fix Version/s: 9.0.0
Affects Version/s: 8.2.0
Component/s: Mission Control Client
Labels:
- sqe-8.2.0

Rendering stack trace on heat map drains the heap memory and causes out of memory exception and performance delays.

Ways to reproduce: Enable heat map and open JFRs with more number of threads and relatively higher stack depth. Switch between JFR pages and watch heat map rendering.

Exception in thread "HeatmapCalculation-1" java.lang.OutOfMemoryError: Java heap space
	at java.base/java.util.Arrays.copyOf(Arrays.java:3537)
	at java.base/java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:229)
	at java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:789)
	at java.base/java.lang.StringBuilder.append(StringBuilder.java:242)
	at org.openjdk.jmc.flightrecorder.serializers.json.StructuredWriter.write(StructuredWriter.java:170)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeEscaped(JsonWriter.java:190)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeEscaped(JsonWriter.java:148)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeStringValue(JsonWriter.java:135)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeField(JsonWriter.java:84)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeFrame(IItemCollectionJsonSerializer.java:151)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeStackTrace(IItemCollectionJsonSerializer.java:139)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeEventAttributes(IItemCollectionJsonSerializer.java:165)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeEvent(IItemCollectionJsonSerializer.java:126)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeRecording(IItemCollectionJsonSerializer.java:96)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.toJsonString(IItemCollectionJsonSerializer.java:66)
	at org.openjdk.jmc.flightrecorder.heatmap.views.HeatmapView$ModelRebuildRunnable.run(HeatmapView.java:104)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "HeatmapCalculation-3" java.lang.OutOfMemoryError: Java heap space
	at java.base/java.util.Arrays.copyOf(Arrays.java:3537)
	at java.base/java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:229)
	at java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:789)
	at java.base/java.lang.StringBuilder.append(StringBuilder.java:242)
	at org.openjdk.jmc.flightrecorder.serializers.json.StructuredWriter.write(StructuredWriter.java:170)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeEscaped(JsonWriter.java:190)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeEscaped(JsonWriter.java:148)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeStringValue(JsonWriter.java:135)
	at org.openjdk.jmc.flightrecorder.serializers.json.JsonWriter.writeField(JsonWriter.java:84)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeFrame(IItemCollectionJsonSerializer.java:151)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeStackTrace(IItemCollectionJsonSerializer.java:139)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeEventAttributes(IItemCollectionJsonSerializer.java:165)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeEvent(IItemCollectionJsonSerializer.java:126)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.writeRecording(IItemCollectionJsonSerializer.java:96)
	at org.openjdk.jmc.flightrecorder.serializers.json.IItemCollectionJsonSerializer.toJsonString(IItemCollectionJsonSerializer.java:66)
	at org.openjdk.jmc.flightrecorder.heatmap.views.HeatmapView$ModelRebuildRunnable.run(HeatmapView.java:104)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)
Exception in thread "HeatmapCalculation-0" java.lang.OutOfMemoryError: Java heap space
Exception in thread "HeatmapCalculation-4" java.lang.OutOfMemoryError: Java heap space
Exception in thread "HeatmapCalculation-2" java.lang.OutOfMemoryError: Java heap space

relates to

JMC-7885 Graphical rendering of dependency view fails due to heap memory drain

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