SERVER-26500 Increase the 'short' sleep between balancer rounds

1 files changed, 5 insertions, 4 deletions

diff --git a/src/mongo/db/s/balancer/balancer.cpp b/src/mongo/db/s/balancer/balancer.cpp
index 9b7db2ef8b7..1cc7d850ada 100644
--- a/src/mongo/db/s/balancer/balancer.cpp
+++ b/src/mongo/db/s/balancer/balancer.cpp
@@ -67,10 +67,11 @@ namespace {
 
 const Seconds kBalanceRoundDefaultInterval(10);
 
-// Delay between balancer rounds if the last round found some chunks which needs to be balanced.
-// This value is set to 0 so that imbalanced clusters or clusters with tag range violations can be
-// processes as quickly as possible.
-const Seconds kShortBalanceRoundInterval(0);
+// Sleep between balancer rounds in the case where the last round found some chunks which needed to
+// be balanced. This value should be set sufficiently low so that imbalanced clusters will quickly
+// reach balanced state, but setting it too low may cause CRUD operations to start failing due to
+// not being able to establish a stable shard version.
+const Seconds kShortBalanceRoundInterval(1);
 
 const auto getBalancer = ServiceContext::declareDecoration<std::unique_ptr<Balancer>>();