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Posted to user@cassandra.apache.org by Daning Wang <da...@netseer.com> on 2013/09/04 23:07:36 UTC

Key cache size

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

Re: Key cache size

Posted by Nate McCall <na...@thelastpickle.com>.
You may have hit memory pressure caising cassandra to resize your cache.
You can change the behavior by modifying reduce_cache_capacity_at in
cassandra.yaml

See the comments in such for details.
On Sep 4, 2013 4:08 PM, "Daning Wang" <da...@netseer.com> wrote:

> 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
>