Github user sarutak commented on a diff in the pull request:
https://github.com/apache/spark/pull/2019#discussion_r16631095
--- Diff: core/src/main/scala/org/apache/spark/network/Connection.scala ---
@@ -263,14 +282,20 @@ class SendingConnection(val address:
InetSocketAddress, selector_ : Selector,
val DEFAULT_INTEREST = SelectionKey.OP_READ
+ var alreadyReading = false
+
override def registerInterest() {
// Registering read too - does not really help in most cases, but for
some
// it does - so let us keep it for now.
- changeConnectionKeyInterest(SelectionKey.OP_WRITE | DEFAULT_INTEREST)
+ changeConnectionKeyInterest(
+ SelectionKey.OP_WRITE | (if (!alreadyReading) {
+ alreadyReading = true
+ DEFAULT_INTEREST
+ } else { 0 }))
--- End diff --
I understand registering DEFAULT_INTEREST (OP_READ) is to detect closing
connection by remote host.
But, once blocked by channel.read() in SendingConnection#read,
DEFAULT_INTEREST is not needed.
In addition, because SendingConnection is never unregistered OP_READ, 2
threads on the same SendingConnection should be active and during one of the
thread cancels its key, another thread can evaluate key.isValid in
ConnectionManager#run.
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