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[SPARK-18379][SQL] Make the parallelism of parallelPartitionDiscovery configurable. #15829

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[SPARK-18379][SQL] Make the parallelism of parallelPartitionDiscovery configurable. #15829

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112f9d1
SPARK-18379: Make the parallelism of parallelPartitionDiscovery confi…
Nov 9, 2016
f6cf77f
update default value and view mode of parallelPartitionDiscoveryParal…
uncleGen Nov 14, 2016
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4 changes: 3 additions & 1 deletion ...rc/main/scala/org/apache/spark/sql/execution/datasources/PartitioningAwareFileIndex.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -317,10 +317,12 @@ object PartitioningAwareFileIndex extends Logging {
val sparkContext = sparkSession.sparkContext
val serializableConfiguration = new SerializableConfiguration(hadoopConf)
val serializedPaths = paths.map(_.toString)
val parallelPartitionDiscoveryParallelism =
sparkSession.sessionState.conf.parallelPartitionDiscoveryParallelism

// Set the number of parallelism to prevent following file listing from generating many tasks
// in case of large #defaultParallelism.
val numParallelism = Math.min(paths.size, 10000)
val numParallelism = Math.min(paths.size, parallelPartitionDiscoveryParallelism)

val statusMap = sparkContext
.parallelize(serializedPaths, numParallelism)
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11 changes: 11 additions & 0 deletions sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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Expand Up @@ -396,6 +396,14 @@ object SQLConf {
.intConf
.createWithDefault(32)

val PARALLEL_PARTITION_DISCOVERY_PARALLELISM =
SQLConfigBuilder("spark.sql.sources.parallelPartitionDiscovery.parallelism")
.doc("The number of parallelism to list a collection of path recursively, Set the " +
"number to prevent file listing from generating too many tasks.")
.internal()
.intConf
.createWithDefault(10000)

// Whether to automatically resolve ambiguity in join conditions for self-joins.
// See SPARK-6231.
val DATAFRAME_SELF_JOIN_AUTO_RESOLVE_AMBIGUITY =
Expand Down Expand Up @@ -774,6 +782,9 @@ private[sql] class SQLConf extends Serializable with CatalystConf with Logging {
def parallelPartitionDiscoveryThreshold: Int =
getConf(SQLConf.PARALLEL_PARTITION_DISCOVERY_THRESHOLD)

def parallelPartitionDiscoveryParallelism: Int =
getConf(SQLConf.PARALLEL_PARTITION_DISCOVERY_PARALLELISM)

def bucketingEnabled: Boolean = getConf(SQLConf.BUCKETING_ENABLED)

def dataFrameSelfJoinAutoResolveAmbiguity: Boolean =
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