Yang Jie created SPARK-58770:
--------------------------------

             Summary: Assign a name to the error condition 
_LEGACY_ERROR_TEMP_3016-3020
                 Key: SPARK-58770
                 URL: https://issues.apache.org/jira/browse/SPARK-58770
             Project: Spark
          Issue Type: Sub-task
          Components: Spark Core
    Affects Versions: 5.0.0
            Reporter: Yang Jie


Convert the five `_LEGACY_ERROR_TEMP_*` conditions in `SparkCoreErrors` that 
cover RDD checkpointing -- `_3016` through `_3020` -- into proper error 
conditions.

Four get user-facing names: `CHECKPOINT_DIRECTORY_NOT_SET` (55019), 
`INVALID_CHECKPOINT_FILE` (58030), `FAILED_CREATE_CHECKPOINT_DIRECTORY` (58030) 
and `CHECKPOINT_RDD_PARTITION_COUNT_MISMATCH` (58030). The fifth, `_3020`, is 
an unreachable defensive branch whose guard sits two lines above its only 
construction site, so it becomes `SparkException.internalError` and its JSON 
entry is deleted.

None of the five had any test coverage; three `checkError` tests are added.




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