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From GitBox <...@apache.org>
Subject [GitHub] TisonKun opened a new pull request #6643: [FLINK-10275] StreamTask support object reuse
Date Fri, 31 Aug 2018 17:35:17 GMT
TisonKun opened a new pull request #6643: [FLINK-10275] StreamTask support object reuse
URL: https://github.com/apache/flink/pull/6643
 
 
   ## What is the purpose of the change
   
   StreamTask support efficient object reuse. The purpose behind this is to reduce pressure
on the garbage collector.
   
   All objects are reused, without backup copies. The operators and UDFs must be careful to
not keep any objects as state or not to modify the objects.
   
   ## Brief change log
   
   - With `ExecutionConfig#isObjectReuseEnable` on, reuse `StreamRecord` associated to `StreamTask`.
   - Also clean code as glancing over. 
   
   
   ## Verifying this change
   
   Add case to unit test `OneInputStreamTaskTest.java` and `TwoInputStreamTaskTest.java`
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not applicable)
   

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