If there is less than 12G memory, use only single flush thread.

1 files changed, 6 insertions, 0 deletions

diff --git a/config-model/src/test/java/com/yahoo/vespa/model/search/NodeResourcesTuningTest.java b/config-model/src/test/java/com/yahoo/vespa/model/search/NodeResourcesTuningTest.java
index fece6ca47e3..861482ab70c 100644
--- a/config-model/src/test/java/com/yahoo/vespa/model/search/NodeResourcesTuningTest.java
+++ b/config-model/src/test/java/com/yahoo/vespa/model/search/NodeResourcesTuningTest.java
@@ -168,6 +168,12 @@ public class NodeResourcesTuningTest {
         assertSharedDisk(true, true);
     }
 
+    @Test
+    public void require_that_concurrent_flush_threads_is_1_with_low_memory() {
+        assertEquals(2, configFromMemorySetting(13, 0).flush().maxconcurrent());
+        assertEquals(1, configFromMemorySetting(11, 0).flush().maxconcurrent());
+    }
+
     private static void assertDocumentStoreMaxFileSize(long expFileSizeBytes, int wantedMemoryGb) {
         assertEquals(expFileSizeBytes, configFromMemorySetting(wantedMemoryGb + reservedMemoryGb, 0).summary().log().maxfilesize());
     }