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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2022/03/18 07:41:21 UTC

[GitHub] [flink] JingGe opened a new pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

JingGe opened a new pull request #19145:
URL: https://github.com/apache/flink/pull/19145


   ## What is the purpose of the change
   
   Found a potential visibility issue and some typos while reading the mailbox code. 
   
   The instance variable mainMailboxExecutor in StreamTask is package-private but only used in subclasses that are in the same package. The visibility should be protected.
   
   
   ## Brief change log
   
     - change the instance variable mainMailboxExecutor in StreamTask to be protected
     - fix the wrong local variable name in MailboxProcessor
     - fix some typos in java doc
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
   


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] JingGe edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1073915816


   > In Java, `protected` implies `package-private`, so it's strictly larger scope.
   
   I see, thanks. It then makes sense to keep package-private which should be only changed if any subclass need to be in a different package. I will remove this change. 


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] flinkbot commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] flinkbot commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] JingGe commented on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1073997526


   @flinkbot run azure


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] pnowojski commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
pnowojski commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1073766951


   I don't mind too much one way or another. I think it was package-private as it's more narrow scope compared to `protected`, and the smaller the scope, usually the better. But IMO it doesn't matter here too much.


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] JingGe commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072710472


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] pnowojski merged pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
pnowojski merged pull request #19145:
URL: https://github.com/apache/flink/pull/19145


   


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] JingGe commented on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1074182941


   @flinkbot run azure


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[GitHub] [flink] MartijnVisser commented on a change in pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
MartijnVisser commented on a change in pull request #19145:
URL: https://github.com/apache/flink/pull/19145#discussion_r829875250



##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
##########
@@ -274,7 +274,7 @@
 
     protected final MailboxProcessor mailboxProcessor;
 
-    final MailboxExecutor mainMailboxExecutor;
+    protected final MailboxExecutor mainMailboxExecutor;

Review comment:
       I can't verify if this is indeed correct, perhaps @fapaul of @AHeise can verify this. 




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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] MartijnVisser commented on a change in pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
MartijnVisser commented on a change in pull request #19145:
URL: https://github.com/apache/flink/pull/19145#discussion_r829875250



##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
##########
@@ -274,7 +274,7 @@
 
     protected final MailboxProcessor mailboxProcessor;
 
-    final MailboxExecutor mainMailboxExecutor;
+    protected final MailboxExecutor mainMailboxExecutor;

Review comment:
       I can't verify if this is indeed correct, perhaps @fapaul of @AHeise can verify this. 




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[GitHub] [flink] JingGe commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072200272


   @MartijnVisser Would you like to review this PR? Many thanks!


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[GitHub] [flink] JingGe commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1073915816


   > > Yeah, I had the same thought. But after I checked the code, it is defined as package-private but used as protected. In this case, it even enlarge the visibility scope, because classes within this package but do not inherit `StreamTask` are able to access it.
   > 
   > In Java, `protected` implies `package-private`, so it's strictly larger scope.
   
   I see, thanks. It then makes sense to keep package-private which should be only changed if any subclass need to be in a different package. I will remove this change. 


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] JingGe commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1073833418


   > I don't mind too much one way or another. I think it was package-private as it's more narrow scope compared to `protected`, and the smaller the scope, usually the better. But IMO it doesn't matter here too much.
   
   Yeah, I had the same thought. But after I checked the code, it is defined as package-private but used as protected. In this case, it even enlarge the visibility scope, because classes within this package but do not inherit `StreamTask` are able to access it. I guess it is not intended to work as package-private and is against OO design and might cause potential issue. Another issue is that any subclass of `StreamTask` that is not in the same package will not be able to access this instance variable. If we want to limit all subclasses of `StreamTask` be in the same package, we should control it via ArchUnit rule.


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[GitHub] [flink] fapaul commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
fapaul commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1073671944


   @pnowojski I guess the visibility change in the `StreamTask` is not a problem but can you double check that this was an oversight?


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] rename local variable name and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] JingGe commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
JingGe commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072200272


   @MartijnVisser Would you like to review this PR? Many thanks!


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125






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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] MartijnVisser commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
MartijnVisser commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072868814


   @flinkbot run azure


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[GitHub] [flink] flinkbot edited a comment on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1072111125


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[GitHub] [flink] AHeise commented on pull request #19145: [hotfix][streaming] fix visibility of the instance variable and fix some typos

Posted by GitBox <gi...@apache.org>.
AHeise commented on pull request #19145:
URL: https://github.com/apache/flink/pull/19145#issuecomment-1073891162


   
   > Yeah, I had the same thought. But after I checked the code, it is defined as package-private but used as protected. In this case, it even enlarge the visibility scope, because classes within this package but do not inherit `StreamTask` are able to access it.
   
   In Java, `protected` implies `package-private`, so it's strictly larger scope.
   


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