Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17097#discussion_r104325447
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala ---
@@ -88,46 +90,93 @@ class CacheManager extends Logging {
query: Dataset[_],
tableName: Option[String] = None,
storageLevel: StorageLevel = MEMORY_AND_DISK): Unit = writeLock {
- val planToCache = query.queryExecution.analyzed
+ val planToCache = query.logicalPlan
if (lookupCachedData(planToCache).nonEmpty) {
logWarning("Asked to cache already cached data.")
} else {
val sparkSession = query.sparkSession
- cachedData +=
- CachedData(
- planToCache,
- InMemoryRelation(
- sparkSession.sessionState.conf.useCompression,
- sparkSession.sessionState.conf.columnBatchSize,
- storageLevel,
-
sparkSession.sessionState.executePlan(planToCache).executedPlan,
- tableName))
+ cachedData.add(CachedData(
+ planToCache,
+ InMemoryRelation(
+ sparkSession.sessionState.conf.useCompression,
+ sparkSession.sessionState.conf.columnBatchSize,
+ storageLevel,
+ sparkSession.sessionState.executePlan(planToCache).executedPlan,
+ tableName)))
}
}
/**
- * Tries to remove the data for the given [[Dataset]] from the cache.
- * No operation, if it's already uncached.
+ * Tries to remove the cache entry of the given query, no operation, if
it's already uncached.
+ * Note that all other caches that refer to this plan will be re-cached.
+ *
+ * @return true if a cache entry is found and removed, false otherwise.
*/
def uncacheQuery(query: Dataset[_], blocking: Boolean = true): Boolean =
writeLock {
- val planToCache = query.queryExecution.analyzed
- val dataIndex = cachedData.indexWhere(cd =>
planToCache.sameResult(cd.plan))
- val found = dataIndex >= 0
+ uncacheQuery(query.sparkSession, query.logicalPlan, blocking)
+ }
+
+ /**
+ * Tries to remove the cache entry of the given plan, no operation, if
it's already uncached.
+ * Note that all other caches that refer to this plan will be re-cached.
--- End diff --
This is a behavior change.
Will `uncache` be a very expensive operation if we recache all the related
cached plans?
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