wangyum commented on issue #24715: [SPARK-25474][SQL] Data source tables support fallback to HDFS for size estimation URL: https://github.com/apache/spark/pull/24715#issuecomment-521683954 > @wangyum do you mean CommandUtils.getSizeInBytesFallBackToHdfs is very slow if there are many files? `CommandUtils.getSizeInBytesFallBackToHdfs` is not very slow. I have no idea why [PartitioningAwareFileIndex.sizeInBytes](https://github.com/apache/spark/blob/b276788d57b270d455ef6a7c5ed6cf8a74885dde/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PartitioningAwareFileIndex.scala#L103) is faster than `CommandUtils.getSizeInBytesFallBackToHdfs`. It may be related to the cluster load, I plan to switch to an idle cluster to test tomorrow.
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