DonalEvans commented on a change in pull request #6701:
URL: https://github.com/apache/geode/pull/6701#discussion_r674408800



##########
File path: 
geode-apis-compatible-with-redis/src/main/java/org/apache/geode/redis/internal/data/RedisHash.java
##########
@@ -237,15 +238,21 @@ public int hstrlen(byte[] field) {
     return new ArrayList<>(hash.keySet());
   }
 
-  public ImmutablePair<Integer, List<byte[]>> hscan(Pattern matchPattern,
-      int count,
-      int cursor) {
-
-    ArrayList<byte[]> resultList = new ArrayList<>(count + 2);
+  public ImmutablePair<Integer, List<byte[]>> hscan(Pattern matchPattern, int 
count, int cursor) {
+    // No need to allocate more space than it's possible to use given the size 
of the hash. We need
+    // to add 1 to hash.size() to ensure that if count > hash.size(), we 
return a cursor of 0
+    long maximumCapacity = 2L * Math.min(count, hlen() + 1);
+    if (maximumCapacity > Integer.MAX_VALUE) {
+      LogService.getLogger().error(

Review comment:
       I've changed the log level to info and made the message more 
descriptive/helpful.




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