srowen commented on a change in pull request #23278: [SPARK-24920][Core] Allow
sharing Netty's memory pool allocators
URL: https://github.com/apache/spark/pull/23278#discussion_r245648784
##########
File path:
common/network-common/src/main/java/org/apache/spark/network/util/NettyUtils.java
##########
@@ -95,6 +111,38 @@ public static String getRemoteAddress(Channel channel) {
return "<unknown remote>";
}
+ /**
+ * Returns the default number of threads for both the Netty client and
server thread pools.
+ * If numUsableCores is 0, we will use Runtime get an approximate number of
available cores.
+ */
+ public static int defaultNumThreads(int numUsableCores) {
+ final int availableCores;
Review comment:
I think `final` is fine and would use it more in Java code, as we of course
use the equivalent `val` by default in Scala. For members, it's obviously best
to use it where possible. However for locals we don't use it much just because
in Java it's extra keywords to look at. I think it's OK here net net.
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