BryanCutler commented on a change in pull request #25515: [SPARK-27659][PYTHON]
Allow PySpark to prefetch during toLocalIterator
URL: https://github.com/apache/spark/pull/25515#discussion_r317755937
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File path: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
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@@ -196,10 +204,15 @@ private[spark] object PythonRDD extends Logging {
// Read request for data, value of zero will stop iteration or
non-zero to continue
if (in.readInt() == 0) {
complete = true
- } else if (collectPartitionIter.hasNext) {
+ } else if (prefetchIter.hasNext) {
// Client requested more data, attempt to collect the next
partition
- val partitionArray = collectPartitionIter.next()
+ val partitionFuture = prefetchIter.next()
+ // Cause the next job to be submitted if prefecthPartitions is
enabled.
Review comment:
typo: `prefecthPartitions` -> `prefetchPartitions`
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