hk-lrzy opened a new pull request, #21258:
URL: https://github.com/apache/flink/pull/21258

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     - Make sure that the pull request corresponds to a [JIRA 
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   ## What is the purpose of the change
   
   *(For example: This pull request makes task deployment go through the blob 
server, rather than through RPC. That way we avoid re-transferring them on each 
deployment (during recovery).)*
   Source Reader is mainly for union batch and streaming logic in single 
interface, it's good point for the developer, but in the `SourceFunction` we 
can access `runtimeconext` to use accumulator before, now the 
`SourceReaderContext` have no method for it, this PR is mainly to support it.
   
   ## Brief change log
   
   *(for example:)*
     - *The TaskInfo is stored in the blob store on job creation time as a 
persistent artifact*
     - *Deployments RPC transmits only the blob storage reference*
     - *TaskManagers retrieve the TaskInfo from the blob cache*
   
   
   ## Verifying this change
   
   Please make sure both new and modified tests in this PR follows the 
conventions defined in our code quality guide: 
https://flink.apache.org/contributing/code-style-and-quality-common.html#testing
   
   *(Please pick either of the following options)*
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   *(or)*
   
   This change is already covered by existing tests, such as *(please describe 
tests)*.
   
   *(or)*
   
   This change added tests and can be verified as follows:
   
   *(example:)*
     - *Added integration tests for end-to-end deployment with large payloads 
(100MB)*
     - *Extended integration test for recovery after master (JobManager) 
failure*
     - *Added test that validates that TaskInfo is transferred only once across 
recoveries*
     - *Manually verified the change by running a 4 node cluster with 2 
JobManagers and 4 TaskManagers, a stateful streaming program, and killing one 
JobManager and two TaskManagers during the execution, verifying that recovery 
happens correctly.*
   
   ## 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)
     - If yes, how is the feature documented? (not applicable / docs / JavaDocs 
/ not documented)
   


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