(ITS#7609) back-meta enhancement: filter patterns for target selection

Full_Name: Howard Chu Version: 2.4.35 OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (78.155.233.73) Submitted by: hyc

Since a lot of applications perform DN lookups using a search filter, it would be useful to allow specifying a regex pattern match on filters to select a target. This would avoid broadcasting a suffix-level search to all targets unnecessarily.

The intended use case is for a system where the DIT is sharded across multiple servers, and entries are distributed across each target using some regular pattern. (e.g., uid=a.* on target1, uid=b.* on target2, etc...)