diff --git a/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java b/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java index 76c6e39a48..e7724f9084 100644 --- a/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java +++ b/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java @@ -2482,8 +2482,11 @@ private static void populateLlapDaemonVarsSet(Set llapDaemonVarsSetLocal // standard error allowed for ndv estimates for FM-sketch. A lower value indicates higher accuracy and a // higher compute cost. HIVE_STATS_NDV_ERROR("hive.stats.ndv.error", (float)20.0, - "Standard error expressed in percentage. Provides a tradeoff between accuracy and compute cost. \n" + - "A lower value for error indicates higher accuracy and a higher compute cost."), + "The standard error allowed for NDV estimates, expressed in percentage. This provides a tradeoff \n" + + "between accuracy and compute cost. A lower value for the error indicates higher accuracy and a \n" + + "higher compute cost. (NDV means the number of distinct values.). It only affects the FM-Sketch \n" + + "(not the HLL algorithm which is the default), where it computes the number of necessary\n" + + " bitvectors to achieve the accuracy."), /** * @deprecated Use MetastoreConf.STATS_NDV_TUNER */