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https://issues.apache.org/jira/browse/FLINK-10663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662174#comment-16662174
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ASF GitHub Bot commented on FLINK-10663:
----------------------------------------
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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> Closing StreamingFileSink can cause NPE
> ---------------------------------------
>
> Key: FLINK-10663
> URL: https://issues.apache.org/jira/browse/FLINK-10663
> Project: Flink
> Issue Type: Bug
> Components: filesystem-connector, Streaming Connectors
> Affects Versions: 1.6.1, 1.7.0
> Environment: Rev cb141940821bcf62f4102dfd5c76aff99d0c15d1
> Reporter: Gary Yao
> Assignee: Gary Yao
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.6.3, 1.7.0
>
>
> *Description*
> If the sink is closed before it's state is initialized, an NPE is thrown.
> *Stacktrace*
> {code}
> java.lang.NullPointerException
> at
> org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink.close(StreamingFileSink.java:378)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.closeFunction(FunctionUtils.java:43)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.dispose(AbstractUdfStreamOperator.java:117)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.disposeAllOperators(StreamTask.java:477)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:378)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:704)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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