We noticed that key cache could not be fully populated, we have set the key cache size to 1024M.

key_cache_size_in_mb: 1024

But none of nodes showed the cache capacity is 1G, we have recently upgraded to 1.2.5, could be an issue in that version?

Token            : (invoke with -T/--tokens to see all 256 tokens)
ID               : 0fd912fb-3187-462b-8c8a-7d223751b649
Gossip active    : true
Thrift active    : true
Load             : 73.16 GB
Generation No    : 1372374984
Uptime (seconds) : 5953779
Heap Memory (MB) : 5440.59 / 10035.25
Data Center      : dc1
Rack             : rac1
Exceptions       : 34601
Key Cache        : size 540060752 (bytes), capacity 540060796 (bytes), 12860975403 hits, 15535054378 requests, 0.839 recent hit rate, 14400 save period in seconds
Row Cache        : size 0 (bytes), capacity 0 (bytes), 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds

Thanks,

Daninng