gfredericks commented on issue #6847:
URL: https://github.com/apache/pulsar/issues/6847#issuecomment-625526092
I noticed if I publish 10 million messages to a topic, meanwhile a slow
subscriber consumes just a handful of them, the stats show something like
```
"storageSize" : 1429259512,
"backlogSize" : 1429122004,
// for the subscription
"msgBacklog" : 10393,
```
What do these numbers mean? Without subscribers the backlogSize is 0; when I
add a subscriber at the beginning, it jumps up to 1.4G; does that mean the
brokers or bookies literally copied all 1.4G of messages into a backlog? If
not, why is the number so large? If so, what does the "10393" mean for the
subscription?
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