Hi,
we have a couple of use cases with wide rows with a small portion of hot data
in them.
Example:
Chatlog:
{
$userid1-$userid2: [{timestamp: message}, {timestamp: message} ...]
}
People tend to check only the most recent pages. So while the current row cache
doesn't work with the wide rows I was thinking of adding optional slice / name
configs to the row cache.
For example this would say: "cache the last 50 coloumns only"
<ColumnFamily Name="Chat" CompareWith="BytesType"
RowsCached="10000" RowCacheLimit="50" RowCacheReversed="true"
/>
This would be limited to configurations that allow to easily determine if the
read / write should go to the cache or not. I would try to make it as simple as
possible by the restriction that reads can either be served entirely by the
cache or not use it at all.
I haven't found anything in jira yet and I guess this might be too app-specific
to be generally interesting but wanted to ask if anybody out there already did
/ tried something in that direction.
Cheers,
Daniel Doubleday
smeet.com, Berlin
