бэкэнд асинхронного метакаталога для slapd (asynchronous metadirectory backend to slapd)
Описание (Description)
The asyncmeta backend to slapd(8) performs basic LDAP proxying
with respect to a set of remote LDAP servers, called "targets".
The information contained in these servers can be presented as
belonging to a single Directory Information Tree (DIT).
A good knowledge of the functionality of the slapd-meta(5)
backend is recommended. This backend has been designed as an
asynchronous version of the meta backend. Unlike meta , the
operation handling threads are no longer pending on the response
from the remote server, thus decreasing the number of threads
necessary to handle the same load. While asyncmeta maintains the
functionality of meta and has a largely similar codebase, some
changes in operation and some new configuration directives have
been added. Some configuration options, such as conn-pool-max ,
conn-ttl , single-conn , and use-temporary-conn have been
removed, as they are no longer relevant.
New connection handling:
Unlike meta, which caches bound connections, the asyncmeta works
with a configured maximum number of connections per target. For
each request redirected to a target, a different connection is
selected. Each connection has a queue, to which the request is
added before it is sent to the remote server, and is removed
after the last response for that request is received.
For each new request, the connection with the smallest number of
pending requests is selected, or using round-robin if the numbers
are equal.
Overlays:
Due to implementation specifics, there is no guarantee that any
of the existing OpenLDAP overlays will work with asyncmeta
backend.
