jonmv commented on code in PR #2154:
URL: https://github.com/apache/zookeeper/pull/2154#discussion_r1766348763
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zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/Learner.java:
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@@ -900,26 +900,26 @@ boolean isRunning() {
}
void closeSocket() {
- if (sock != null) {
- if (sockBeingClosed.compareAndSet(false, true)) {
- if (closeSocketAsync) {
- final Thread closingThread = new Thread(() ->
closeSockSync(), "CloseSocketThread(sid:" + zk.getServerId());
- closingThread.setDaemon(true);
- closingThread.start();
- } else {
- closeSockSync();
- }
+ if (sockBeingClosed.compareAndSet(false, true)) {
+ if (sock == null) { // Closing before establishing the connection
is a noop
+ return;
+ }
Review Comment:
Close could be called from different threads, and `sockBeingClosed` ensures
memory visibility for `sock`, as it's set _after_ `sock` is assigned in
`connectToLeader`.
The only other thread I can see that closes the learner, right now, is the
sync processor, which is initialised _after_ `sock` is assigned, so it works
as-was, but I still prefer to be explicit about this.
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