From 3bc35f9ce917c630c401b2ed0d56b3a51658a5e2 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 14 Apr 2014 15:56:30 +0200
Subject: [PATCH] Correctly replicate PFDEBUG GETREG.

Even if it is a debugging command, make sure that when it forces a
change in encoding, the command is propagated.
---
 src/hyperloglog.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/hyperloglog.c b/src/hyperloglog.c
index b7c4b6cf..fe0a5d7a 100644
--- a/src/hyperloglog.c
+++ b/src/hyperloglog.c
@@ -1306,9 +1306,12 @@ void pfdebugCommand(redisClient *c) {
     if (!strcasecmp(cmd,"getreg")) {
         if (c->argc != 3) goto arityerr;
 
-        if (hllSparseToDense(o) == REDIS_ERR) {
-            addReplyError(c,"HLL sparse encoding is corrupted");
-            return;
+        if (hdr->encoding == HLL_SPARSE) {
+            if (hllSparseToDense(o) == REDIS_ERR) {
+                addReplyError(c,"HLL sparse encoding is corrupted");
+                return;
+            }
+            server.dirty++; /* Force propagation on encoding change. */
         }
 
         hdr = o->ptr;