If you have rados bench data around, you'll need to run cleanup a second
time because the first time the "benchmark_last_metadata" object
will be consulted to find what objects to remove.
Also, using cleanup this way will only remove objects from the default
namespace unless a namespace is specified with the -N option.
rados -p <poolname> -N <namespace> cleanup --prefix ""
David
On 6/24/15 11:06 PM, Podoski, Igor wrote:
Hi,
It appears, that cleanup can be used as a purge:
rados -p <poolname> cleanup --prefix ""
Regards,
Igor.
-----Original Message-----
From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-owner@xxxxxxxxxxxxxxx] On Behalf Of Deneau, Tom
Sent: Wednesday, June 24, 2015 10:22 PM
To: Dałek, Piotr; ceph-devel
Subject: RE: deleting objects from a pool
I've noticed that deleting objects from a basic k=2 m=1 erasure pool is much much slower than deleting a similar number of objects from a replicated size 3 pool (so the same number of files to be deleted). It looked like the ec pool object deletion was almost 20x slower. Is there a lot more work to be done to delete an ec pool object?
-- Tom
-----Original Message-----
From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-
owner@xxxxxxxxxxxxxxx] On Behalf Of Dalek, Piotr
Sent: Wednesday, June 24, 2015 11:56 AM
To: ceph-devel
Subject: Re: deleting objects from a pool
-----Original Message-----
From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-
owner@xxxxxxxxxxxxxxx] On Behalf Of Deneau, Tom
Sent: Wednesday, June 24, 2015 6:44 PM
I have benchmarking situations where I want to leave a pool around
but delete a lot of objects from the pool. Is there any really fast
way to do
that?
I noticed rados rmpool is fast but I don't want to remove the pool.
I have been spawning multiple threads, each deleting a subset of the
objects
(which I believe is what rados bench write does) but even that can
be very slow.
For now, apart from "rados -p <poolname> cleanup" (which doesn't purge
the pool, but merely removes objects written during last benchmark
run), the only option is by brute force:
for i in $(rados -p <poolname> ls); do (rados -p <poolname> rm $i
&>/dev/null &); done;
There's no "purge pool" command in rados -- not yet, at least. I was
thinking about one, but never really had time to implement one.
With best regards / Pozdrawiam
Piotr Dałek
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