Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22699#discussion_r224504103
--- Diff: sbin/start-history-server.sh ---
@@ -28,7 +28,22 @@ if [ -z "${SPARK_HOME}" ]; then
export SPARK_HOME="$(cd "`dirname "$0"`"/..; pwd)"
fi
+# NOTE: This exact class name is matched downstream by SparkSubmit.
+# Any changes need to be reflected there.
+CLASS="org.apache.spark.deploy.history.HistoryServer"
+
+if [[ "$@" = *--help ]] || [[ "$@" = *-h ]]; then
+ echo "Usage: ./sbin/start-history-server.sh [options]"
--- End diff --
nit: why not have a separated `usage()` function?
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