Update configs

Author: viirya

common/src/main/scala/org/apache/comet/CometConf.scala

@@ -322,8 +322,10 @@ object CometConf extends ShimCometConf {
 
   val COMET_COLUMNAR_SHUFFLE_MEMORY_SIZE: OptionalConfigEntry[Long] =
     conf("spark.comet.columnar.shuffle.memorySize")
+      .internal()
       .doc(
-        "The optional maximum size of the memory used for Comet columnar shuffle, in MiB. " +
+        "Test-only config. This is only used to test Comet shuffle with Spark tests. " +
+          "The optional maximum size of the memory used for Comet columnar shuffle, in MiB. " +
           "Note that this config is only used when `spark.comet.exec.shuffle.mode` is " +
           "`jvm`. Once allocated memory size reaches this config, the current batch will be " +
           "flushed to disk immediately. If this is not configured, Comet will use " +
@@ -335,8 +337,10 @@ object CometConf extends ShimCometConf {
 
   val COMET_COLUMNAR_SHUFFLE_MEMORY_FACTOR: ConfigEntry[Double] =
     conf("spark.comet.columnar.shuffle.memory.factor")
+      .internal()
       .doc(
-        "Fraction of Comet memory to be allocated per executor process for Comet shuffle. " +
+        "Test-only config. This is only used to test Comet shuffle with Spark tests. " +
+          "Fraction of Comet memory to be allocated per executor process for Comet shuffle. " +
           "Comet memory size is specified by `spark.comet.memoryOverhead` or " +
           "calculated by `spark.comet.memory.overhead.factor` * `spark.executor.memory`.")
       .doubleConf

docs/source/user-guide/configs.md

@@ -29,7 +29,6 @@ Comet provides the following configuration settings.
 | spark.comet.columnar.shuffle.async.enabled | Whether to enable asynchronous shuffle for Arrow-based shuffle. | false |
 | spark.comet.columnar.shuffle.async.max.thread.num | Maximum number of threads on an executor used for Comet async columnar shuffle. This is the upper bound of total number of shuffle threads per executor. In other words, if the number of cores * the number of shuffle threads per task `spark.comet.columnar.shuffle.async.thread.num` is larger than this config. Comet will use this config as the number of shuffle threads per executor instead. | 100 |
 | spark.comet.columnar.shuffle.async.thread.num | Number of threads used for Comet async columnar shuffle per shuffle task. Note that more threads means more memory requirement to buffer shuffle data before flushing to disk. Also, more threads may not always improve performance, and should be set based on the number of cores available. | 3 |
-| spark.comet.columnar.shuffle.memory.factor | Fraction of Comet memory to be allocated per executor process for Comet shuffle. Comet memory size is specified by `spark.comet.memoryOverhead` or calculated by `spark.comet.memory.overhead.factor` * `spark.executor.memory`. | 1.0 |
 | spark.comet.convert.csv.enabled | When enabled, data from Spark (non-native) CSV v1 and v2 scans will be converted to Arrow format. Note that to enable native vectorized execution, both this config and 'spark.comet.exec.enabled' need to be enabled. | false |
 | spark.comet.convert.json.enabled | When enabled, data from Spark (non-native) JSON v1 and v2 scans will be converted to Arrow format. Note that to enable native vectorized execution, both this config and 'spark.comet.exec.enabled' need to be enabled. | false |
 | spark.comet.convert.parquet.enabled | When enabled, data from Spark (non-native) Parquet v1 and v2 scans will be converted to Arrow format. Note that to enable native vectorized execution, both this config and 'spark.comet.exec.enabled' need to be enabled. | false |