maropu commented on a change in pull request #23768: [SPARK-26851][SQL] Fix
double-checked locking in CachedRDDBuilder
URL: https://github.com/apache/spark/pull/23768#discussion_r256705744
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryRelation.scala
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@@ -49,7 +49,7 @@ case class CachedRDDBuilder(
storageLevel: StorageLevel,
@transient cachedPlan: SparkPlan,
tableName: Option[String])(
- @transient private var _cachedColumnBuffers: RDD[CachedBatch] = null) {
+ @transient @volatile private var _cachedColumnBuffers: RDD[CachedBatch] =
null) {
Review comment:
IIUC we use `var` here to support cache buffer clearance? `def
clearCache(blocking: Boolean = true)`
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