garyli1019 opened a new pull request #1362: HUDI-644 Enable user to get 
checkpoint from previous commits in DeltaStreamer
URL: https://github.com/apache/incubator-hudi/pull/1362
 
 
   
   ## What is the purpose of the pull request
   
   This PR is to resolve the following problem:
   
   The user is using a homebrew Spark data source to read new data and write to 
Hudi table
   
   The user would like to migrate to Delta Streamer
   
   But the Delta Streamer only checks the last commit metadata, if there is no 
checkpoint info, then the Delta Streamer will use the default. For Kafka 
source, it is LATEST. 
   
   The user would like to run the homebrew Spark data source reader and Delta 
Streamer in parallel to prevent data loss, but the Spark data source writer 
will make commit without checkpoint info, which will reset the delta streamer. 
   
   So if we have an option to allow the user to retrieve the checkpoint from 
previous commits instead of the latest commit would be helpful for the 
migration. 
   
   ## Brief change log
   
     - *Add an option to restrieve checkpoint in DeltaSync*
   
   ## Verify this pull request
   
   
   This pull request is a trivial rework / code cleanup without any test 
coverage.
   
   
   ## Committer checklist
   
    - [ ] Has a corresponding JIRA in PR title & commit
    
    - [ ] Commit message is descriptive of the change
    
    - [ ] CI is green
   
    - [ ] Necessary doc changes done or have another open PR
          
    - [ ] For large changes, please consider breaking it into sub-tasks under 
an umbrella JIRA.

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