Github user jerryshao commented on a diff in the pull request: https://github.com/apache/spark/pull/21867#discussion_r205312971 --- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala --- @@ -731,7 +731,14 @@ private[spark] class BlockManager( } if (data != null) { - return Some(ChunkedByteBuffer.fromManagedBuffer(data, chunkSize)) + // SPARK-24307 undocumented "escape-hatch" in case there are any issues in converting to + // to ChunkedByteBuffer, to go back to old code-path. Can be removed post Spark 2.4 if + // new path is stable. + if (conf.getBoolean("spark.fetchToNioBuffer", false)) { --- End diff -- Maybe we'd better to rename that one "spark.maxRemoteBlockSizeFetchToMem" also ?
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