liupc commented on a change in pull request #23989: [SPARK-27073][CORE]Handling
of IdleStateEvent causes the normal connection to close
URL: https://github.com/apache/spark/pull/23989#discussion_r263989403
##########
File path:
common/network-common/src/main/java/org/apache/spark/network/server/TransportChannelHandler.java
##########
@@ -155,10 +155,11 @@ public void userEventTriggered(ChannelHandlerContext
ctx, Object evt) throws Exc
// To avoid a race between TransportClientFactory.createClient() and
this code which could
// result in an inactive client being returned, this needs to run in a
synchronized block.
synchronized (this) {
+ boolean hasInFlightRequests = responseHandler.numOutstandingRequests()
> 0;
Review comment:
I think we should handle the synchronization when reading/writing with
`responseHandler` to fix it.
It seems that the `outstandingRequests` related variables of
`responeHandler` is not guaranteed to be visible immediately once updated, and
the update of `outstandingRequests` and `timeOfLastRequestNs` is not atomic, so
that there are cases the fix here not working?
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