Myasuka commented on a change in pull request #43:
URL: https://github.com/apache/flink-docker/pull/43#discussion_r525867175



##########
File path: docker-entrypoint.sh
##########
@@ -93,21 +94,49 @@ prepare_job_manager_start() {
     envsubst < "${CONF_FILE}" > "${CONF_FILE}.tmp" && mv "${CONF_FILE}.tmp" 
"${CONF_FILE}"
 }
 
+disable_jemalloc_env() {
+  if [ "$1" = ${COMMAND_DISABLE_JEMALLOC} ]; then
+      echo "Disable Jemalloc as the memory allocator"
+      return 0
+  else
+      echo "Enable Jemalloc as the memory allocator via appending env variable 
LD_PRELOAD with /usr/lib/x86_64-linux-gnu/libjemalloc.so"
+      export LD_PRELOAD=$LD_PRELOAD:/usr/lib/x86_64-linux-gnu/libjemalloc.so
+      return 1
+  fi
+}
+
 if [ "$1" = "help" ]; then
-    echo "Usage: $(basename "$0") 
(jobmanager|${COMMAND_STANDALONE}|taskmanager|${COMMAND_NATIVE_KUBERNETES}|${COMMAND_HISTORY_SERVER}|help)"
+    printf "Usage: $(basename "$0") 
(jobmanager|${COMMAND_STANDALONE}|taskmanager|${COMMAND_NATIVE_KUBERNETES}|${COMMAND_HISTORY_SERVER})
 [${COMMAND_DISABLE_JEMALLOC}]\n"
+    printf "    Or $(basename "$0") help\n\n"
+    printf "By default, Flink image adopts jemalloc as default memory 
allocator and will disable jemalloc if option '${COMMAND_DISABLE_JEMALLOC}' 
given.\n"
     exit 0
 elif [ "$1" = "jobmanager" ]; then
     shift 1
+    disable_jemalloc_env $@
+    disabled_jemalloc="$?"
+    if [ ${disabled_jemalloc} = 0 ]; then
+      shift 1
+    fi

Review comment:
       I have refactored the function and update the array of arguments within 
the new `disable_jemalloc_env` function and then passed to next commands.




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