diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactingMemStore.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactingMemStore.java
index d60b04924c9..44b40ebf36a 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactingMemStore.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactingMemStore.java
@@ -136,10 +136,14 @@ public class CompactingMemStore extends AbstractMemStore {
       numStores = 1;
     }
     inmemoryFlushSize = memstoreFlushSize / numStores;
-    // multiply by a factor (the same factor for all index types)
-    factor = conf.getDouble(IN_MEMORY_FLUSH_THRESHOLD_FACTOR_KEY,
+    // multiply by a factor (different factors for different index types)
+    if (indexType == IndexType.ARRAY_MAP) {
+      factor = conf.getDouble(IN_MEMORY_FLUSH_THRESHOLD_FACTOR_KEY,
           IN_MEMORY_FLUSH_THRESHOLD_FACTOR_DEFAULT);
-
+    } else {
+      factor = conf.getDouble(IN_MEMORY_FLUSH_THRESHOLD_FACTOR_KEY,
+          IN_MEMORY_FLUSH_THRESHOLD_FACTOR_DEFAULT);
+    }
     inmemoryFlushSize = (long) (inmemoryFlushSize * factor);
     LOG.info("Setting in-memory flush size threshold to {} and immutable segments index to type={}",
         StringUtils.byteDesc(inmemoryFlushSize), indexType);