FrankChen021 commented on pull request #10383:
URL: https://github.com/apache/druid/pull/10383#issuecomment-693185689


   Marked as WIP temporarily.
   
   `JsonReader.hasNext`, which calls the jackson's `MappingIterator.hasNext`, 
throws exception when a json text is ill-formed, this causes some old test 
cases on `sample` to fail while test cases on `read` are successfully passed. 
This is because stream ingestion handle each record one by one, and if one 
fails to parse the json next, the exception is caught and handled gracefully, 
while `sample` treats all records as a whole if one record fails, the sample 
process aborts.
   
   It would take some time to handle this problem.


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