Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r116906282
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -278,4 +278,10 @@ package object config {
"spark.io.compression.codec.")
.booleanConf
.createWithDefault(false)
+ private[spark] val SHUFFLE_ACCURATE_BLOCK_THRESHOLD =
+ ConfigBuilder("spark.shuffle.accurateBlkThreshold")
+ .doc("This only works in HighlyCompressedMapStatus. Sizes of blocks
above this threshold" +
+ " will be recorded accurately. This is to help control memory cost
when shuffle blocks.")
--- End diff --
how about
```
When we compress the size of shuffle blocks in HighlyCompressedMapStatus,
we will record the size accurately if it's above the threshold specified by
this config. This helps to prevent OOM by avoiding underestimating shuffle
block size when fetching shuffle blocks.
```
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