Santiago M. Mola created SPARK-8628:
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Summary: Race condition in AbstractSparkSQLParser.parse
Key: SPARK-8628
URL: https://issues.apache.org/jira/browse/SPARK-8628
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.4.0, 1.3.1, 1.3.0
Reporter: Santiago M. Mola
Priority: Critical
SPARK-5009 introduced the following code:
def parse(input: String): LogicalPlan = {
// Initialize the Keywords.
lexical.initialize(reservedWords)
phrase(start)(new lexical.Scanner(input)) match {
case Success(plan, _) => plan
case failureOrError => sys.error(failureOrError.toString)
}
}
The corresponding initialize method in SqlLexical is not thread-safe:
/* This is a work around to support the lazy setting */
def initialize(keywords: Seq[String]): Unit = {
reserved.clear()
reserved ++= keywords
}
I'm hitting this when parsing multiple SQL queries concurrently. When one query
parsing starts, it empties the reserved keyword list, then a race-condition
occurs and other queries fail to parse because they recognize keywords as
identifiers.
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