Shixiong Zhu created SPARK-24337:
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             Summary: Improve the error message for invalid SQL conf value
                 Key: SPARK-24337
                 URL: https://issues.apache.org/jira/browse/SPARK-24337
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Shixiong Zhu


Right now Spark will throw the following error message when a config is set to 
an invalid value. It would be great if the error message contains the config 
key so that it's easy to tell which one is wrong.

{code}
Size must be specified as bytes (b), kibibytes (k), mebibytes (m), gibibytes 
(g), tebibytes (t), or pebibytes(p). E.g. 50b, 100k, or 250m.
Fractional values are not supported. Input was: 1.6
        at 
org.apache.spark.network.util.JavaUtils.byteStringAs(JavaUtils.java:291)
        at 
org.apache.spark.internal.config.ConfigHelpers$.byteFromString(ConfigBuilder.scala:66)
        at 
org.apache.spark.internal.config.ConfigBuilder$$anonfun$bytesConf$1.apply(ConfigBuilder.scala:234)
        at 
org.apache.spark.internal.config.ConfigBuilder$$anonfun$bytesConf$1.apply(ConfigBuilder.scala:234)
        at 
org.apache.spark.sql.internal.SQLConf.setConfString(SQLConf.scala:1300)
        at 
org.apache.spark.sql.internal.BaseSessionStateBuilder$$anonfun$mergeSparkConf$1.apply(BaseSessionStateBuilder.scala:78)
        at 
org.apache.spark.sql.internal.BaseSessionStateBuilder$$anonfun$mergeSparkConf$1.apply(BaseSessionStateBuilder.scala:77)
        at 
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
        at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
        at 
org.apache.spark.sql.internal.BaseSessionStateBuilder.mergeSparkConf(BaseSessionStateBuilder.scala:77)
        at 
org.apache.spark.sql.internal.BaseSessionStateBuilder.conf$lzycompute(BaseSessionStateBuilder.scala:90)
        at 
org.apache.spark.sql.internal.BaseSessionStateBuilder.conf(BaseSessionStateBuilder.scala:88)
        at 
org.apache.spark.sql.internal.BaseSessionStateBuilder.build(BaseSessionStateBuilder.scala:289)
        at 
org.apache.spark.sql.SparkSession$.org$apache$spark$sql$SparkSession$$instantiateSessionState(SparkSession.scala:1071)
        ... 59 more
{code}



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