Thanks Chuck.
Just one more question about rebalancing. Have there been measurements on how
much it affects performance when a rebalance is in progress? I would assume its
an operation that puts some load on the system, while also keeping track of
whether the original object changed while moving, among other things. Its
probably not that frequent, but it would be great to understand how it works in
the real world with large workloads.
I did have a general question about container sync. Is it something that is
used a lot, and works well?
-- Mark
________________________________
From: Chuck Thier <cth...@gmail.com>
To: Mark Brown <ntdeveloper2...@yahoo.com>
Cc: Openstack <openstack@lists.launchpad.net>
Sent: Wednesday, May 22, 2013 7:26 AM
Subject: Re: [Openstack] Swift questions
Hey Mark,
On Wed, May 22, 2013 at 8:59 AM, Mark Brown <ntdeveloper2...@yahoo.com> wrote:
Thank you for the responses Chuck.
>
>
>As part of a rebalance, the replicator, I would assume, copies the object from
>the old partition to the new partition, and then deletes it from the old
>partition. Is that a fair assumption?
That is correct, the replicators will replicate the data in the partition at
the new location. The server that has the old data will delete it once it is
certain that data is available in all replicas.
Also, is there anything that explains in more detail how the handoff node is
picked? What if the ring changes and the data still lives on the handoff node?
I don't think there is currently any documentation that describes how handoff
nodes are picked. Handoff nodes can be used for a variety of reasons,
including when servers are down, or not responding. The server that has
handoff partitions is always responsible for getting the data to the correct
location.
There is some more detailed information on replication at:
http://docs.openstack.org/developer/swift/overview_replication.html
(if you haven't read it yet)
--
Chuck
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