Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4921#discussion_r148247266
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/utils/ParameterTool.java ---
@@ -210,15 +212,44 @@ public static ParameterTool fromSystemProperties() {
return fromMap((Map) System.getProperties());
}
+ private static final Object placeholder = new Object();
+
// ------------------ ParameterUtil ------------------------
protected final Map<String, String> data;
- protected final Map<String, String> defaultData;
- protected final Set<String> unrequestedParameters;
+
+ // data which is only used on the client and does not need to be
transmitted
+ protected transient Map<String, String> defaultData;
+ protected transient Map<String, Object> unrequestedParameters;
private ParameterTool(Map<String, String> data) {
- this.data = new HashMap<>(data);
- this.defaultData = new HashMap<>();
- this.unrequestedParameters = new HashSet<>(data.keySet());
+ this.data = Collections.unmodifiableMap(new HashMap<>(data));
+
+ this.defaultData = new ConcurrentHashMap<>(data.size());
+
+ this.unrequestedParameters = new
ConcurrentHashMap<>(data.size());
--- End diff --
Good idea. Didn't know that this existed.
---
