gatorsmile commented on a change in pull request #23539: [SPARK-26617][SQL]
Cache manager locks
URL: https://github.com/apache/spark/pull/23539#discussion_r249334042
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala
##########
@@ -136,21 +137,27 @@ class CacheManager extends Logging {
spark: SparkSession,
plan: LogicalPlan,
cascade: Boolean,
- blocking: Boolean): Unit = writeLock {
+ blocking: Boolean): Unit = {
val shouldRemove: LogicalPlan => Boolean =
if (cascade) {
_.find(_.sameResult(plan)).isDefined
} else {
_.sameResult(plan)
}
- val it = cachedData.iterator()
- while (it.hasNext) {
- val cd = it.next()
- if (shouldRemove(cd.plan)) {
- cd.cachedRepresentation.cacheBuilder.clearCache(blocking)
- it.remove()
+ val toRemove = mutable.Buffer[CachedData]()
+ readLock {
Review comment:
The first protected block should be something like:
```Scala
writeLock {
val it = cachedData.iterator()
while (it.hasNext) {
val cd = it.next()
if (cd.sessionUuidOpt == sessionUuidOpt && condition(cd.plan)) {
needToRecache += cd
it.remove()
}
}
}
```
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