e70cad4c52
Today `testOnlyBlocksOnConnectionsToNewNodes` fails (extremely rarely) if the
last attempt to connect to `node0` is delayed for so long that the test runs
`nodeConnectionsBlocks.clear()` before the connection attempt obtains the
expected connection block. We can turn this into a reliable failure with this
delay:
```diff
diff --git a/server/src/main/java/org/elasticsearch/cluster/NodeConnectionsService.java b/server/src/main/java/org/elasticsearch/cluster/NodeConnectionsService.java
index f48413824d3..9a1d0336bcd 100644
--- a/server/src/main/java/org/elasticsearch/cluster/NodeConnectionsService.java
+++ b/server/src/main/java/org/elasticsearch/cluster/NodeConnectionsService.java
@@ -300,6 +300,13 @@ public class NodeConnectionsService extends AbstractLifecycleComponent {
private final Runnable connectActivity = () -> threadPool.executor(ThreadPool.Names.MANAGEMENT).execute(new AbstractRunnable() {
@Override
protected void doRun() {
+
+ try {
+ Thread.sleep(500);
+ } catch (InterruptedException e) {
+ throw new AssertionError("unexpected", e);
+ }
+
assert Thread.holdsLock(mutex) == false : "mutex unexpectedly held";
transportService.connectToNode(discoveryNode);
consecutiveFailureCount.set(0);
```
This commit reverts the extra logging introduced in #43979 and fixes this
failure by waiting for the connection attempt to hit the barrier before
removing it.
Fixes #40170
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