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[SPARK-53435][SQL] Fix race condition in CachedRDDBuilder #52174

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[SPARK-53435][SQL] Fix race condition in CachedRDDBuilder #52174

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27 changes: 7 additions & 20 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryRelation.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -273,35 +273,22 @@ case class CachedRDDBuilder(
serializer.supportsColumnarInput(cachedPlan.output)
}

def cachedColumnBuffers: RDD[CachedBatch] = {
def cachedColumnBuffers: RDD[CachedBatch] = synchronized {
if (_cachedColumnBuffers == null) {
synchronized {
if (_cachedColumnBuffers == null) {
_cachedColumnBuffers = buildBuffers()
}
}
_cachedColumnBuffers = buildBuffers()
}
_cachedColumnBuffers
}

def clearCache(blocking: Boolean = false): Unit = {
def clearCache(blocking: Boolean = false): Unit = synchronized {
if (_cachedColumnBuffers != null) {
synchronized {
if (_cachedColumnBuffers != null) {
_cachedColumnBuffers.unpersist(blocking)
_cachedColumnBuffers = null
}
}
_cachedColumnBuffers.unpersist(blocking)
_cachedColumnBuffers = null
}
}

def isCachedColumnBuffersLoaded: Boolean = {
if (_cachedColumnBuffers != null) {
synchronized {
return _cachedColumnBuffers != null && isCachedRDDLoaded
}
}
false
def isCachedColumnBuffersLoaded: Boolean = synchronized {
_cachedColumnBuffers != null && isCachedRDDLoaded
}

private def isCachedRDDLoaded: Boolean = {
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