On Tue, Apr 21, 2015 at 3:26 PM Leif Hedstrom <zw...@apache.org> wrote:
> This feature is poorly supported, and causes grief for cache development > due to how it #ifdef’s with the system. There are plans for a new system > that would make the concept of cache hierarchies generic. In the mean time, > the suggestion is that if you need this, you use one of > > 1) Assigning content to volumes and disks via our existing configs. > > 2) Use Linux’s bcache feature, which comes with Linux 3.10 or > later. I suspect e.g. ZFS has something similar. > > Just want to point out that in addition to bcache there is dm-cache. https://lwn.net/Articles/548348/ > 3) Use a third party system to implement the hybrid device (e.g. > flash cache or EnhanceIO. > > > This is tracked in the Jira: > > https://issues.apache.org/jira/browse/TS-3541 > > as well as > > https://issues.apache.org/jira/browse/TS-3165 > > > Unless we hear otherwise within 1 week, this will be implemented for > 6.0.0. We will update the Wiki with the library version dependencies (see > below). > > — Leif > >
