From 5d30eae56051c563a8427f330b09ef66db0a0d21 Mon Sep 17 00:00:00 2001 From: Sean Owen Date: Mon, 29 Jun 2015 17:21:35 -0700 Subject: [PATCH] [SPARK-8437] [DOCS] Using directory path without wildcard for filename slow for large number of files with wholeTextFiles and binaryFiles Note that 'dir/*' can be more efficient in some Hadoop FS implementations that 'dir/' Author: Sean Owen Closes #7036 from srowen/SPARK-8437 and squashes the following commits: 0e813ae [Sean Owen] Note that 'dir/*' can be more efficient in some Hadoop FS implementations that 'dir/' --- core/src/main/scala/org/apache/spark/SparkContext.scala | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/core/src/main/scala/org/apache/spark/SparkContext.scala b/core/src/main/scala/org/apache/spark/SparkContext.scala index b3c3bf3746e18..cb7e24c374152 100644 --- a/core/src/main/scala/org/apache/spark/SparkContext.scala +++ b/core/src/main/scala/org/apache/spark/SparkContext.scala @@ -831,6 +831,8 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli * }}} * * @note Small files are preferred, large file is also allowable, but may cause bad performance. + * @note On some filesystems, `.../path/*` can be a more efficient way to read all files in a directory + * rather than `.../path/` or `.../path` * * @param minPartitions A suggestion value of the minimal splitting number for input data. */ @@ -878,9 +880,11 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli * (a-hdfs-path/part-nnnnn, its content) * }}} * - * @param minPartitions A suggestion value of the minimal splitting number for input data. - * * @note Small files are preferred; very large files may cause bad performance. + * @note On some filesystems, `.../path/*` can be a more efficient way to read all files in a directory + * rather than `.../path/` or `.../path` + * + * @param minPartitions A suggestion value of the minimal splitting number for input data. */ @Experimental def binaryFiles(