mridulm commented on code in PR #41709:
URL: https://github.com/apache/spark/pull/41709#discussion_r1240868705
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core/src/main/scala/org/apache/spark/util/Utils.scala:
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@@ -2287,6 +2287,23 @@ private[spark] object Utils extends Logging with
SparkClassUtils {
}.map(threadInfoToThreadStackTrace)
}
+ /** Return a heap dump. Used to capture dumps for the web UI */
+ def getHeapHistogram(): Array[String] = {
+ // From Java 9+, we can use 'ProcessHandle.current().pid()'
+ val pid = getProcessName().split("@").head
+ val builder = new ProcessBuilder("jmap", "-histo:live", pid)
+ builder.redirectErrorStream(true)
+ val p = builder.start()
+ val r = new BufferedReader(new InputStreamReader(p.getInputStream()))
+ val rows = ArrayBuffer.empty[String]
+ var line = ""
+ while (line != null) {
+ if (line.nonEmpty) rows += line
+ line = r.readLine()
+ }
+ rows.toArray
Review Comment:
Use `IOUtils.readLines` or `Source.getLines` instead ?
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