From 9efb5b8c515faa102c02e38c9616e54831205321 Mon Sep 17 00:00:00 2001
From: sumeerbhola <sumeer@cockroachlabs.com>
Date: Wed, 20 Nov 2024 21:22:39 -0500
Subject: [PATCH] wal: reduce flake in TestConcurrentWritersWithManyRecords

Informs #4035
---
 wal/failover_writer_test.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wal/failover_writer_test.go b/wal/failover_writer_test.go
index 9bbf81e511..cd0e8a6770 100644
--- a/wal/failover_writer_test.go
+++ b/wal/failover_writer_test.go
@@ -663,6 +663,9 @@ func TestConcurrentWritersWithManyRecords(t *testing.T) {
 		if i > 0 && i%switchInterval == 0 {
 			dirIndex = (dirIndex + 1) % 2
 			ww.switchToNewDir(dirs[dirIndex])
+			// switchToNewDir does not synchronously create the new writer, so wait
+			// until the writer is created.
+			<-logWriterCreated
 		}
 	}
 	time.Sleep(5 * time.Millisecond)