These are release notes for the Swift 0.6 release. Items
listed below are changes since Swift 0.5 - both enhancements
and known issues.

Swift 0.6 is built from Swift SVN r2177 and CoG SVN r2127.
(0.5 was swift r1783 cog r1962)

A more detailed change log can be found in CHANGES.txt in the distribution
tarball.

This release contains the following new features:

* job replication (experimental)

When a job has been queued on a site for too long, Swift can resubmit the
job (possibly to a different site). Replication is controlled by
replication.* parameters in the swift.properties configuration file. Those
parameters are documented inline in that configuration file.

* cog coasters (experimental)

Swift can use cog coasters which allow a pilot job to be submitted to
a site which will pull in actual Swift jobs for execution. This has
several advantages:
 .  when a large number of jobs need to be submitted, using coasters
    reduces the job submission overhead in (eg) GRAM to one job per
    worker node. 
 .  once a node is allocated to a coaster, it can be used to run
    many swift jobs, avoiding the need for each job to be queued
    separately.

* rate limiting for bad sites

Previous versions of Swift would try to ensure that each site had at
least two jobs queued or running at once, no matter how poorly performing.
Swift v0.6 will substantially reduce the number of jobs sent to poorly
performing sites; when a site score goes below 1 (job at once) then
Swift will delay sending more jobs to that site, with the delay increasing
exponentially as the score lowers.

* more compile time type checking

More type checking is done at compile time. This will catch some errors at the
start of execution which would previously have been detected later on in a run,
and will give more useful error messages.