viirya commented on a change in pull request #25856: [SPARK-29182][Core] Cache
preferred locations of checkpointed RDD
URL: https://github.com/apache/spark/pull/25856#discussion_r338887135
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File path: core/src/main/scala/org/apache/spark/internal/config/package.scala
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@@ -783,6 +783,17 @@ package object config {
.booleanConf
.createWithDefault(false)
+ private[spark] val CACHE_CHECKPOINT_PREFERRED_LOCS_EXPIRE_TIME =
+ ConfigBuilder("spark.rdd.checkpoint.cachePreferredLocsExpireTime")
+ .internal()
+ .doc("Expire time in minutes for caching preferred locations of
checkpointed RDD." +
+ "Caching preferred locations can relieve query loading to DFS and save
the query " +
+ "time. The drawback is that the cached locations can be possibly
outdated and " +
+ "lose data locality. If this config is not specified or is 0, it will
not cache.")
Review comment:
yea, good catch.
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