swift-object-updater - Online in the Cloud

PROGRAM:

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
log to console
-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

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