Ángel Álvarez Pascua created SPARK-51579:
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Summary: Spark CSV Read Low Performance: EOFExceptions in
Univocity Parser
Key: SPARK-51579
URL: https://issues.apache.org/jira/browse/SPARK-51579
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 4.0.0
Reporter: Ángel Álvarez Pascua
When Spark reads a CSV file, it drops new line characters before parsing the
content in the
{{org.apache.spark.sql.catalyst.csv.UnivocityParser.parseIterator}} method.
During parsing, {{UnivocityParser}} expects a delimiter or a new line
character. However, with new lines removed, it internally throws (and later
ignores) an {{EOFException}} for each line.
h4. *Impact:*
* The repeated generation of {{EOFException}} instances is an expensive
operation in the JVM.
* This leads to significant performance degradation during CSV file loading.
h4. *Expected Behavior:*
* Spark should handle new line characters appropriately to prevent excessive
exception generation.
* Optimizing this behavior would improve overall CSV parsing performance.
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