Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/2002#discussion_r16398843
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -449,12 +449,66 @@ private[spark] object Utils extends Logging {
}
/**
- * Get a temporary directory using Spark's spark.local.dir property, if
set. This will always
- * return a single directory, even though the spark.local.dir property
might be a list of
- * multiple paths.
+ * Get the path of temporary directory. Spark's local directories can
be configured through
+ * multiple settings, which are used with the following precedence:
+ *
+ * - If called from inside of a YARN container, this will return a
directory chosen by YARN.
+ * - If the SPARK_LOCAL_DIRS environment variable is set, this will
return a directory from it.
+ * - Otherwise, if the spark.local.dir is set, this will return a
directory from it.
+ * - Otherwise, this will return java.io.tmpdir.
+ *
+ * Some of these configuration options might be lists of multiple paths,
but this method will
+ * always return a single directory.
*/
def getLocalDir(conf: SparkConf): String = {
- conf.get("spark.local.dir",
System.getProperty("java.io.tmpdir")).split(',')(0)
+ getOrCreateLocalRootDirs(conf)(0)
+ }
+
+ private[spark] def isRunningInYarnContainer(conf: SparkConf): Boolean = {
+ conf.getenv("NM_HOST") != null || conf.getenv("CONTAINER_ID") != null
+ }
+
+ /**
+ * Gets or creates the directories listed in spark.local.dir or
SPARK_LOCAL_DIRS,
+ * and returns only the directories that exist / could be created.
--- End diff --
Even though it's redundant - it might be good to explicitly say that this
can return an empty list.
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