DEBUG HTSTATS <dbid> added.

The command reports information about the hash table internal state
representing the specified database ID.

This can be used in order to investigate rehashings, memory usage issues
and for other debugging purposes.

1 files changed, 21 insertions, 0 deletions

diff --git a/src/debug.c b/src/debug.c
index b8dcf648e..2acba1495 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -425,6 +425,27 @@ void debugCommand(redisClient *c) {
         sizes = sdscatprintf(sizes,"dictentry:%d ", (int)sizeof(dictEntry));
         sizes = sdscatprintf(sizes,"sdshdr:%d", (int)sizeof(struct sdshdr));
         addReplyBulkSds(c,sizes);
+    } else if (!strcasecmp(c->argv[1]->ptr,"htstats") && c->argc == 3) {
+        long dbid;
+        sds stats = sdsempty();
+        char buf[4096];
+
+        if (getLongFromObjectOrReply(c, c->argv[2], &dbid, NULL) != REDIS_OK)
+            return;
+        if (dbid < 0 || dbid >= server.dbnum) {
+            addReplyError(c,"Out of range database");
+            return;
+        }
+
+        stats = sdscatprintf(stats,"[Dictionary HT]\n");
+        dictGetStats(buf,sizeof(buf),server.db[dbid].dict);
+        stats = sdscat(stats,buf);
+
+        stats = sdscatprintf(stats,"[Expires HT]\n");
+        dictGetStats(buf,sizeof(buf),server.db[dbid].expires);
+        stats = sdscat(stats,buf);
+
+        addReplyBulkSds(c,stats);
     } else if (!strcasecmp(c->argv[1]->ptr,"jemalloc") && c->argc == 3) {
 #if defined(USE_JEMALLOC)
         if (!strcasecmp(c->argv[2]->ptr, "info")) {