Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5849#discussion_r29899220
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlSerializer2.scala
---
@@ -49,7 +49,7 @@ private[sql] class Serializer2SerializationStream(
out: OutputStream)
extends SerializationStream with Logging {
- val rowOut = new DataOutputStream(out)
+ val rowOut = new DataOutputStream(new BufferedOutputStream(out))
--- End diff --
Ah, nice catch; I guess that this is accounting for the fact that other
code in Spark purposely avoids buffering under the assumption that the
serializer does its own internal buffering; this should give a nice perf. boost
in some cases, I imagine.
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