AEROSPIKE_ERR_RECORD_NOT_FOUND after refresh or redirect. about aerospike-client-hhvm

[paulm17]

I've seen a few times now in the logs:

Aug 31 2015 18:00:06 GMT: WARNING (rw): (thr_rw.c::3233) unusual - setting generation 0<Digest>:0x4203052e5a17092669b030d2e7a43b2453fbf6eb

I presume when trying to write the session object?

[paulm17]

I also see this too:

After I have written data to aerospike:

Aug 31 2015 18:02:10 GMT: INFO (info): (thr_info.c::4885) namespace sessions: disk inuse: 1920 memory inuse: 64 (bytes) sindex memory inuse: 0 (bytes) avail pct 99 cache-read pct 100.00
Aug 31 2015 18:02:10 GMT: INFO (info): (thr_info.c::4885) namespace writes: disk inuse: 2304 memory inuse: 192 (bytes) sindex memory inuse: 0 (bytes) avail pct 99 cache-read pct 100.00

After just a few minutes:

Aug 31 2015 18:06:00 GMT: INFO (info): (thr_info.c::4885) namespace sessions: disk inuse: 0 memory inuse: 0 (bytes) sindex memory inuse: 0 (bytes) avail pct 99 cache-read pct 0.00
Aug 31 2015 18:06:00 GMT: INFO (info): (thr_info.c::4885) namespace writes: disk inuse: 0 memory inuse: 0 (bytes) sindex memory inuse: 0 (bytes) avail pct 99 cache-read pct 0.00

Now the file sizes are zero? Misconfiguration on aerospike configuration?