dongjoon-hyun commented on code in PR #41709:
URL: https://github.com/apache/spark/pull/41709#discussion_r1239373194
##########
core/src/main/scala/org/apache/spark/util/Utils.scala:
##########
@@ -2287,6 +2287,22 @@ 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] = {
+ val pid = String.valueOf(ProcessHandle.current().pid())
+ val builder = new ProcessBuilder("jmap", "-histo:live", pid)
Review Comment:
We are inside `JVM` already.
```
$ docker run -it --rm openjdk:11 bash
root@d7d08a90ec41:/# jshell
Jun 23, 2023 6:30:14 AM java.util.prefs.FileSystemPreferences$1 run
INFO: Created user preferences directory.
| Welcome to JShell -- Version 11.0.16
| For an introduction type: /help intro
jshell> var p = new ProcessBuilder("jmap", "-histo:live",
String.valueOf(ProcessHandle.current().pid())).start()
p ==> Process[pid=77, exitValue="not exited"]
jshell> var r = new BufferedReader(new InputStreamReader(p.getInputStream()))
r ==> java.io.BufferedReader@5fa7e7ff
jshell> var line = ""
line ==> ""
jshell> while (line != null) { line = r.readLine();
System.out.println(line); }
num #instances #bytes class name (module)
-------------------------------------------------------
1: 8938 412040 [B ([email protected])
2: 8705 208920 java.lang.String ([email protected])
```
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