srowen commented on a change in pull request #24028: [SPARK-26917][SQL] Further
reduce locks in CacheManager
URL: https://github.com/apache/spark/pull/24028#discussion_r264004630
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala
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@@ -194,16 +188,10 @@ class CacheManager extends Logging {
private def recacheByCondition(
spark: SparkSession,
condition: CachedData => Boolean): Unit = {
- val needToRecache = scala.collection.mutable.ArrayBuffer.empty[CachedData]
- readLock {
- val it = cachedData.iterator()
- while (it.hasNext) {
- val cd = it.next()
- if (condition(cd)) {
- needToRecache += cd
- }
- }
+ val cachedDataCopy = readLock {
+ cachedData.asScala.clone()
}
+ val needToRecache = cachedDataCopy.filter(cd => condition(cd))
Review comment:
Could just be `.filter(condition)`, but doesn't matter
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