Github user WeichenXu123 commented on a diff in the pull request:
https://github.com/apache/spark/pull/12978#discussion_r63700865
--- Diff: sbin/spark-daemon.sh ---
@@ -162,6 +162,15 @@ run_command() {
esac
echo "$newpid" > "$pid"
+
+ for i in {1..10}
+ do
+ if [[ $(ps -p "$newpid" -o comm=) =~ "java" ]]; then
+ break
+ fi
+ sleep 0.5
--- End diff --
Oh..the sleep 2 statement can't move.
the loop may take at most 5 seconds to check whether the daemon turn into
java daemon. When it become java daemon, it jump out the loop.
**then must sleep 2 seconds,**
then check whether the java daemon die. Because java daemon may exist for
some time and then throw an Exception and die. So here need to wait for some
time.
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