NAME¶
swift-object-updater - Openstack-swift object updater
SYNOPSIS¶
swift-object-updater [CONFIG] [-h|--help] [-v|--verbose] [-o|--once]
DESCRIPTION¶
The object updater is responsible for updating object information in container
listings. It will check to see if there are any locally queued updates on the
filesystem of each devices, what is also known as async pending file(s), walk
each one and update the container listing.
For example, suppose a container server is under load and a new object is put
into the system. The object will be immediately available for reads as soon as
the proxy server responds to the client with success. However, the object
server has not been able to update the object listing in the container server.
Therefore, the update would be queued locally for a later update. Container
listings, therefore, may not immediately contain the object. This is where an
eventual consistency window will most likely come in to play.
In practice, the consistency window is only as large as the frequency at which
the updater runs and may not even be noticed as the proxy server will route
listing requests to the first container server which responds. The server
under load may not be the one that serves subsequent listing requests –
one of the other two replicas may handle the listing.
The options are as follows:
- -v
- --verbose
- -o
- --once
- only run one pass of daemon
DOCUMENTATION¶
More in depth documentation in regards to
swift-object-updater and also
about Openstack-Swift as a whole can be found at
http://swift.openstack.org/index.html
SEE ALSO¶
object-server.conf(5)