mridulm commented on code in PR #46506:
URL: https://github.com/apache/spark/pull/46506#discussion_r1595887602
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common/network-common/src/main/java/org/apache/spark/network/client/TransportClientFactory.java:
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@@ -169,8 +169,10 @@ public TransportClient createClient(String remoteHost, int
remotePort, boolean f
// this code was able to update things.
TransportChannelHandler handler = cachedClient.getChannel().pipeline()
.get(TransportChannelHandler.class);
- synchronized (handler) {
- handler.getResponseHandler().updateTimeOfLastRequest();
+ if (handler != null) {
Review Comment:
`synchronized` will throw an NPE if called on `null` - and `handler` is a
local variable at this point, so the `null` check should be fine.
This should be a fairly rare occurrence - if I am not wrong, this is due to
socket close between the `isActive` call and the subsequent
`pipeline().get(TransportChannelHandler.class)` call - but agree with
@dongjoon-hyun, we have to make sure the exception is at the `sychronized`
statement itself : which version was this observed against @cxzl25 ?
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