[jira] [Created] (SPARK-58842) Add descriptive messages to bare require checks in ALS

["Uroš Bojanić (Jira)" <ji...@apache.org>]

Uroš Bojanić created SPARK-58842:
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             Summary: Add descriptive messages to bare require checks in ALS
                 Key: SPARK-58842
                 URL: https://issues.apache.org/jira/browse/SPARK-58842
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 4.3.0
            Reporter: Uroš Bojanić


ALS has 14 bare require(...) checks with no message, so when one trips it produces only 'requirement failed', giving no indication of which invariant broke in a long-running factorization job. Examples: require(c >= 0.0), require(a.length == k), require(blockId < numBlocks).

This adds a short message to each, naming the values involved, e.g. require(c >= 0.0, s"Observation weight must be non-negative but found $c."). The file already establishes the pattern with require(numBlocks > 0, s"numBlocks must be positive but found $numBlocks.").

Conditions and exception types are unchanged; only message text is added. This mirrors SPARK-58621, which did the same for SummarizerBuffer.



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