cloud-fan commented on issue #23510: [SPARK-26590][CORE] make fetch-block-to-disk backward compatible URL: https://github.com/apache/spark/pull/23510#issuecomment-454437493 > What do you mean by "we can just simply turn on this feature in Spark 3.0"? The fetch-block-to-disk feature was introduced at Spark 2.2 and is disabled by default because it's incompatible with shuffle service prior to Spark 2.2. If we don't need to maintain Spark prior to 2.2 anymore, maybe we can simply turn it on by default now, even without this PR. This is a general improvement about backward compatibility and helps us to get rid of the hacky code in the future. I don't have other specific goals in mind.
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