beliefer commented on code in PR #10708:
URL:
https://github.com/apache/incubator-gluten/pull/10708#discussion_r2354112067
##########
gluten-core/src/main/scala/org/apache/spark/util/SparkDirectoryUtil.scala:
##########
@@ -67,16 +68,19 @@ class SparkDirectoryUtil private (val roots: Array[String])
extends Logging {
}
object SparkDirectoryUtil extends Logging {
+ private val state = new AtomicBoolean(false)
private var INSTANCE: SparkDirectoryUtil = _
- def init(conf: SparkConf): Unit = synchronized {
+ def init(conf: SparkConf): Unit = {
val roots = Utils.getConfiguredLocalDirs(conf)
init(roots)
}
- private def init(roots: Array[String]): Unit = synchronized {
+ private def init(roots: Array[String]): Unit = {
if (INSTANCE == null) {
- INSTANCE = new SparkDirectoryUtil(roots)
+ if (state.compareAndSet(false, true)) {
+ INSTANCE = new SparkDirectoryUtil(roots)
+ }
return
Review Comment:
Because remove `if (INSTANCE == null)` will cause NPE. So I removed `if
(INSTANCE.roots.toSet != roots.toSet)`.
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