Fix tracking table max keys option in redis.conf.

redis.conf

@@ -626,20 +626,23 @@ replica-priority 100
 # to track the keys fetched by many clients.
 #
 # For this reason it is possible to configure a maximum fill value for the
-# invalidation table. By default it is set to 10%, and once this limit is
-# reached, Redis will start to evict caching slots in the invalidation table
-# even if keys are not modified, just to reclaim memory: this will in turn
+# invalidation table. By default it is set to 1M of keys, and once this limit
+# is reached, Redis will start to evict keys in the invalidation table
+# even if they were not modified, just to reclaim memory: this will in turn
 # force the clients to invalidate the cached values. Basically the table
-# maximum fill rate is a trade off between the memory you want to spend server
+# maximum size is a trade off between the memory you want to spend server
 # side to track information about who cached what, and the ability of clients
 # to retain cached objects in memory.
 #
-# If you set the value to 0, it means there are no limits, and all the 16
-# millions of caching slots can be used at the same time. In the "stats"
-# INFO section, you can find information about the amount of caching slots
-# used at every given moment.
+# If you set the value to 0, it means there are no limits, and Redis will
+# retain as many keys as needed in the invalidation table.
+# In the "stats" INFO section, you can find information about the number of
+# keys in the invalidation table at every given moment.
 #
-# tracking-table-max-fill 10
+# Note: when key tracking is used in broadcasting mode, no memory is used
+# in the server side so this setting is useless.
+#
+# tracking-table-max-keys 1000000
 
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