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Posted to reviews@spark.apache.org by "pan3793 (via GitHub)" <gi...@apache.org> on 2023/04/24 07:01:56 UTC
[GitHub] [spark] pan3793 opened a new pull request, #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
pan3793 opened a new pull request, #40920:
URL: https://github.com/apache/spark/pull/40920
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### What changes were proposed in this pull request?
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Remove unnecessary serialize/deserialize of `Path` on parallel gather partition stats.
### Why are the changes needed?
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Simplify code, since `Path` is serializable in Hadoop3.
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No.
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Pass GA.
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[GitHub] [spark] pan3793 commented on pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "pan3793 (via GitHub)" <gi...@apache.org>.
pan3793 commented on PR #40920:
URL: https://github.com/apache/spark/pull/40920#issuecomment-1524462509
kindly ping @sunchao
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[GitHub] [spark] LuciferYang commented on a diff in pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "LuciferYang (via GitHub)" <gi...@apache.org>.
LuciferYang commented on code in PR #40920:
URL: https://github.com/apache/spark/pull/40920#discussion_r1175420930
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
##########
@@ -789,22 +789,22 @@ case class RepairTableCommand(
if (partitionSpecsAndLocs.length > threshold) {
val hadoopConf = spark.sessionState.newHadoopConf()
val serializableConfiguration = new SerializableConfiguration(hadoopConf)
- val serializedPaths = partitionSpecsAndLocs.map(_._2.toString).toArray
+ val locations = partitionSpecsAndLocs.map(_._2).toArray
Review Comment:
Can we remove `toArray`?
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[GitHub] [spark] LuciferYang commented on a diff in pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "LuciferYang (via GitHub)" <gi...@apache.org>.
LuciferYang commented on code in PR #40920:
URL: https://github.com/apache/spark/pull/40920#discussion_r1175425968
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
##########
@@ -789,22 +789,22 @@ case class RepairTableCommand(
if (partitionSpecsAndLocs.length > threshold) {
val hadoopConf = spark.sessionState.newHadoopConf()
val serializableConfiguration = new SerializableConfiguration(hadoopConf)
- val serializedPaths = partitionSpecsAndLocs.map(_._2.toString).toArray
+ val locations = partitionSpecsAndLocs.map(_._2)
// Set the number of parallelism to prevent following file listing from generating many tasks
// in case of large #defaultParallelism.
- val numParallelism = Math.min(serializedPaths.length,
+ val numParallelism = Math.min(locations.length,
Math.min(spark.sparkContext.defaultParallelism, 10000))
// gather the fast stats for all the partitions otherwise Hive metastore will list all the
// files for all the new partitions in sequential way, which is super slow.
logInfo(s"Gather the fast stats in parallel using $numParallelism tasks.")
- spark.sparkContext.parallelize(serializedPaths, numParallelism)
- .mapPartitions { paths =>
+ spark.sparkContext.parallelize(locations, numParallelism)
+ .mapPartitions { locationsEachPartition =>
val pathFilter = getPathFilter(serializableConfiguration.value)
- paths.map(new Path(_)).map{ path =>
- val fs = path.getFileSystem(serializableConfiguration.value)
- val statuses = fs.listStatus(path, pathFilter)
- (path.toString, PartitionStatistics(statuses.length, statuses.map(_.getLen).sum))
+ locationsEachPartition.map { location =>
+ val fs = location.getFileSystem(serializableConfiguration.value)
+ val statuses = fs.listStatus(location, pathFilter)
+ (location.toString, PartitionStatistics(statuses.length, statuses.map(_.getLen).sum))
Review Comment:
How about change the return type to `Map[Path, PartitionStatistics]`, not sure if it would be better
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[GitHub] [spark] sunchao closed pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "sunchao (via GitHub)" <gi...@apache.org>.
sunchao closed pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
URL: https://github.com/apache/spark/pull/40920
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[GitHub] [spark] LuciferYang commented on a diff in pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "LuciferYang (via GitHub)" <gi...@apache.org>.
LuciferYang commented on code in PR #40920:
URL: https://github.com/apache/spark/pull/40920#discussion_r1175422370
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
##########
@@ -789,22 +789,22 @@ case class RepairTableCommand(
if (partitionSpecsAndLocs.length > threshold) {
val hadoopConf = spark.sessionState.newHadoopConf()
val serializableConfiguration = new SerializableConfiguration(hadoopConf)
- val serializedPaths = partitionSpecsAndLocs.map(_._2.toString).toArray
+ val locations = partitionSpecsAndLocs.map(_._2).toArray
// Set the number of parallelism to prevent following file listing from generating many tasks
// in case of large #defaultParallelism.
- val numParallelism = Math.min(serializedPaths.length,
+ val numParallelism = Math.min(locations.length,
Review Comment:
Are `locations.length` and `partitionSpecsAndLocs.length` equal?
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[GitHub] [spark] pan3793 commented on a diff in pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "pan3793 (via GitHub)" <gi...@apache.org>.
pan3793 commented on code in PR #40920:
URL: https://github.com/apache/spark/pull/40920#discussion_r1175443729
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
##########
@@ -789,22 +789,22 @@ case class RepairTableCommand(
if (partitionSpecsAndLocs.length > threshold) {
val hadoopConf = spark.sessionState.newHadoopConf()
val serializableConfiguration = new SerializableConfiguration(hadoopConf)
- val serializedPaths = partitionSpecsAndLocs.map(_._2.toString).toArray
+ val locations = partitionSpecsAndLocs.map(_._2).toArray
// Set the number of parallelism to prevent following file listing from generating many tasks
// in case of large #defaultParallelism.
- val numParallelism = Math.min(serializedPaths.length,
+ val numParallelism = Math.min(locations.length,
Review Comment:
Yes, changed to evaluate once as `partitionNum`
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[GitHub] [spark] pan3793 commented on pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "pan3793 (via GitHub)" <gi...@apache.org>.
pan3793 commented on PR #40920:
URL: https://github.com/apache/spark/pull/40920#issuecomment-1520446235
cc @sunchao
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[GitHub] [spark] pan3793 commented on a diff in pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "pan3793 (via GitHub)" <gi...@apache.org>.
pan3793 commented on code in PR #40920:
URL: https://github.com/apache/spark/pull/40920#discussion_r1175444671
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
##########
@@ -789,22 +789,22 @@ case class RepairTableCommand(
if (partitionSpecsAndLocs.length > threshold) {
val hadoopConf = spark.sessionState.newHadoopConf()
val serializableConfiguration = new SerializableConfiguration(hadoopConf)
- val serializedPaths = partitionSpecsAndLocs.map(_._2.toString).toArray
+ val locations = partitionSpecsAndLocs.map(_._2).toArray
Review Comment:
done
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[GitHub] [spark] pan3793 commented on a diff in pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "pan3793 (via GitHub)" <gi...@apache.org>.
pan3793 commented on code in PR #40920:
URL: https://github.com/apache/spark/pull/40920#discussion_r1175442719
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
##########
@@ -789,22 +789,22 @@ case class RepairTableCommand(
if (partitionSpecsAndLocs.length > threshold) {
val hadoopConf = spark.sessionState.newHadoopConf()
val serializableConfiguration = new SerializableConfiguration(hadoopConf)
- val serializedPaths = partitionSpecsAndLocs.map(_._2.toString).toArray
+ val locations = partitionSpecsAndLocs.map(_._2)
// Set the number of parallelism to prevent following file listing from generating many tasks
// in case of large #defaultParallelism.
- val numParallelism = Math.min(serializedPaths.length,
+ val numParallelism = Math.min(locations.length,
Math.min(spark.sparkContext.defaultParallelism, 10000))
// gather the fast stats for all the partitions otherwise Hive metastore will list all the
// files for all the new partitions in sequential way, which is super slow.
logInfo(s"Gather the fast stats in parallel using $numParallelism tasks.")
- spark.sparkContext.parallelize(serializedPaths, numParallelism)
- .mapPartitions { paths =>
+ spark.sparkContext.parallelize(locations, numParallelism)
+ .mapPartitions { locationsEachPartition =>
val pathFilter = getPathFilter(serializableConfiguration.value)
- paths.map(new Path(_)).map{ path =>
- val fs = path.getFileSystem(serializableConfiguration.value)
- val statuses = fs.listStatus(path, pathFilter)
- (path.toString, PartitionStatistics(statuses.length, statuses.map(_.getLen).sum))
+ locationsEachPartition.map { location =>
+ val fs = location.getFileSystem(serializableConfiguration.value)
+ val statuses = fs.listStatus(location, pathFilter)
+ (location.toString, PartitionStatistics(statuses.length, statuses.map(_.getLen).sum))
Review Comment:
Looks simpler, adopted.
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[GitHub] [spark] sunchao commented on pull request #40920: [SPARK-43248][SQL] Unnecessary serialize/deserialize of Path on parallel gather partition stats
Posted by "sunchao (via GitHub)" <gi...@apache.org>.
sunchao commented on PR #40920:
URL: https://github.com/apache/spark/pull/40920#issuecomment-1524621007
Oops almost forgot. Merged to master, thanks!
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