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[SPARK-29182][CORE][FOLLOWUP] Cache preferred locations of checkpoint…
…ed RDD ### What changes were proposed in this pull request? This is a followup to apache#25856. This fixes the document about the config value of spark.rdd.checkpoint.cachePreferredLocsExpireTime. ### Why are the changes needed? The document is not correct. spark.rdd.checkpoint.cachePreferredLocsExpireTime can not be 0. ### Does this PR introduce any user-facing change? No ### How was this patch tested? This is document only change. Closes apache#26251 from viirya/SPARK-29182-followup. Authored-by: Liang-Chi Hsieh <viirya@gmail.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
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