[jira] [Created] (FLINK-9693) possible memory link in jobmanager retaining archived checkpoints

["Steven Zhen Wu (JIRA)" <ji...@apache.org>]

Steven Zhen Wu created FLINK-9693:
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             Summary: possible memory link in jobmanager retaining archived checkpoints
                 Key: FLINK-9693
                 URL: https://issues.apache.org/jira/browse/FLINK-9693
             Project: Flink
          Issue Type: Bug
          Components: JobManager, State Backends, Checkpointing
         Environment: !image.png!!image (1).png!
            Reporter: Steven Zhen Wu
         Attachments: image (1).png, image.png

First, some context about the job
* Flink 1.4.1
* embarrassingly parallel: all operators are chained together
* parallelism is over 1,000
* stateless except for Kafka source operators. checkpoint size is 8.4 MB.
* set "state.backend.fs.memory-threshold" so that only jobmanager writes to S3 to checkpoint
* internal checkpoint with 10 checkpoints retained in history
 
Summary of the observations
* 41,567 ExecutionVertex objects retained 9+ GB of memory
* Expanded in one ExecutionVertex. it seems to storing the kafka offsets for source operator



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