Comment 1 for bug 1534062

I'm seeing this too and it's causing a range of breakages as a result.
In our case we use getAllKeys to filter keys for a targetted purge. As a result, our cache is not purged leading to unreliable behaviour.

As an alternative to the above suggestions, calling a `stats slabs` or `stats items` command returns a list of the stats for each slab.
It should be reasonably easy to loop over the results and calls the relevant `stats cachedump %u 0 0\r\n` on just the slabs returned and would result in one single call to fetch the list of slabs, vs 63/256 calls to return a list of empty slabs.