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From GitBox <...@apache.org>
Subject [GitHub] GJL commented on a change in pull request #6915: [FLINK-10663][streaming] Fix NPE when StreamingFileSink is closed without initialization.
Date Wed, 24 Oct 2018 11:50:43 GMT
GJL commented on a change in pull request #6915: [FLINK-10663][streaming] Fix NPE when StreamingFileSink
is closed without initialization.
URL: https://github.com/apache/flink/pull/6915#discussion_r227754363
 
 

 ##########
 File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/sink/filesystem/StreamingFileSink.java
 ##########
 @@ -375,6 +375,8 @@ public void invoke(IN value, SinkFunction.Context context) throws Exception
{
 
 	@Override
 	public void close() throws Exception {
-		buckets.close();
+		if (buckets != null) {
 
 Review comment:
   `bucket` is non-final, and `Cmd + Alt + F7` shows there is only one assignment in `initializeState()`.
One reason why `buckets` can be `null` is that `initializeState()` is not called at all. Another
reason is that `initializeState()` exits prematurely due to exceptions. 
   If there were more things to be closed, we would need more null checks, and I would not
add a comment to every null check. Hence, I would also not add a comment when there is only
a single null check. Imo a comment could be perceived as too verbose because the necessity
of it is simple enough to understand.

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