xuanyuanking opened a new pull request #26663: [SPARK-30015][Core] Continuous shuffle block fetching should be disabled by default when the old fetch protocol is used URL: https://github.com/apache/spark/pull/26663 ### What changes were proposed in this pull request? Disable continuous shuffle block fetching when the old fetch protocol in use. ### Why are the changes needed? The new feature of continuous shuffle block fetching depends on the latest version of the shuffle fetch protocol. We should keep this constraint in `BlockStoreShuffleReader.fetchContinuousBlocksInBatch`. ### Does this PR introduce any user-facing change? Users will not get the exception related to continuous shuffle block fetching when old version of the external shuffle service is used. ### How was this patch tested? Existing UT.
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