[Openstack] [Swift] When does replicator reclaim objects?

Clay Gerrard clay.gerrard at gmail.com
Fri Oct 17 02:32:24 UTC 2014

The container server has it's own reclaim age setting - make sure you fix
that up to clear out those container db's (do they have three replica?)

the .ts files might be more trixy -

How's replica count of 1 working out for you?  Are you raid backed or just
dev test don't care about your data?  What does a *-replicator even *do* if
there's nothing in the node list to talk to - just revert handoffs I
guess.... seems like there's a high probably of missing objects after a
ring change :D


On Thu, Oct 9, 2014 at 9:17 PM, Shrinand Javadekar <shrinand at maginatics.com>

> Hi,
> I have a single node Swift cluster with a replica count of 1. I
> recently found that writes to this instance were becoming incredibly
> slow due to two types of timeouts:
> 1) container-server timeout when trying to lock the db.
> 2) object-server timeout when connecting to the container-server
> (saving for async update later).
> I suspect this is happening because the sqlite db has grown to be very
> large. The .db file the container directory was 1.5GB in size.
> I looked at the "objects" table from the container db and it showed it
> had >10M entries. 4M out of these had the "deleted" bit set. In order
> to reduce the size of the db, I changed the "reclaim_age" option in
> the "object-replicator" config to 30 seconds. This setting is
> perfectly fine for my use case because there is a single replica.
> As per the documentation, the replicator considers a directory for
> replication when a new object gets written into it. At that time, the
> replicator will also delete objects which have gone past the
> reclaim_age. However, even after several thousands of new object
> writes, I don't see the ".ts" files being deleted or the container db
> entries being removed.
> 1) Does the replicator delete objects even when there is no
> replication involved? E.g. when replica count is 1.
> 2) Are there other ways to tune the system for objects to be deleted
> faster?
> -Shri
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