kiszk commented on a change in pull request #34846:
URL: https://github.com/apache/spark/pull/34846#discussion_r765659849
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File path: core/src/main/scala/org/apache/spark/util/Utils.scala
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@@ -3204,6 +3205,27 @@ private[spark] object Utils extends Logging {
}
files.toSeq
}
+
+ private def isG1GarbageCollector: Boolean = {
+ val gcs = ManagementFactory.getGarbageCollectorMXBeans.asScala
+ gcs.exists(_.getName.equalsIgnoreCase("G1 Young Generation")) ||
+ gcs.exists(_.getName.equalsIgnoreCase("G1 Old Generation"))
+ }
+
+ /**
+ * Return true if current GC algorithm is G1 GC and the requested sizeInBytes
+ * are larger than 50% of the region size in G1.
+ */
+ def isHumongousAllocation(sizeInBytes: Long): Boolean = {
+ if (isG1GarbageCollector) {
+ val heapRegionSize = ManagementFactory
+ .getPlatformMXBean(classOf[HotSpotDiagnosticMXBean])
+ .getVMOption("G1HeapRegionSize").getValue.toLong
Review comment:
I am afraid that this line may throw an exception in the future due to
specification changes.
How about wrapping this by `try ... catch`?
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