Huanli Wang created SPARK-40466:
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             Summary: Improve the error message if the DSv2 source is disabled 
but DSv1 streaming source is not available
                 Key: SPARK-40466
                 URL: https://issues.apache.org/jira/browse/SPARK-40466
             Project: Spark
          Issue Type: Improvement
          Components: Structured Streaming
    Affects Versions: 3.4.0
            Reporter: Huanli Wang
             Fix For: 3.4.0


If the V2 data source is disabled, current behavior will fallback to use V1 
data source. But it will throw error when the DSv1 is not available. Update the 
error message to indicate what config variable 
(spark.sql.streaming.disabledV2MicroBatchReaders) needs to be modified in order 
to enable the V2 data source.



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