dongjoon-hyun commented on code in PR #44172:
URL: https://github.com/apache/spark/pull/44172#discussion_r1414898758
##########
core/src/main/scala/org/apache/spark/internal/config/package.scala:
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@@ -1910,6 +1910,16 @@ package object config {
.booleanConf
.createWithDefault(true)
+ private[spark] val IO_COMPRESSION_ZSTD_WORKERS =
+ ConfigBuilder("spark.io.compression.zstd.workers")
+ .doc("Thread size spawned to compress in parallel when using Zstd. When
value <= 0, " +
+ "no worker is spawned, it works in single-threaded mode. When value >
0, it triggers " +
+ "asynchronous mode, corresponding number of threads are spawned. More
workers improve " +
+ "performance, but also increase memory cost.")
+ .version("4.0.0")
+ .intConf
+ .createWithDefault(8)
Review Comment:
Ya, we should use `0` by default because this has a side-effect on both CPU
cycle and native Memory usage. The production job can have perf regressions.
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