Hello Alex. Would you mind sharing what version of Riak and Riak CS you
are using? Also if you can post the the contents of your Riak CS
app.config file
it might help give a better idea of what might be going on.
Generally listing the contents of a bucket is more expensive than a
normal download or upload request, but there have been performance
improvements in recent
versions of Riak CS and there are settings that can be adjusted
depending on the version you are using. The time required to list the
contents of the entire bucket
is definitely related to the number of objects in that bucket so the
time will continue to increase as the number of objects increases, but
we do continue to work to
make the process as efficient as possible.
Depending on why you need to list the contents of the bucket the
max-keys query parameter available with the bucket listing operation may
be useful. By default this
limit is 1000 keys, but s3cmd does not expose this that I'm aware of and
instead buffers all the results until the end of the contents is
reached. But if you need
to list the contents for the purpose of some processing step, it may
work better for you to break up this process into smaller chunks using
max-keys.
Kelly
On 08/15/2014 06:39 AM, Alex Millar wrote:
So the issue we’re having is only with bucket listing.
alxndrmlr@alxndrmlr-mbp $ time s3cmd -c .s3cfg-riakcs-admin ls
s3://bonfirehub-resources-can-east-doc-conversion
DIR s3://bonfirehub-resources-can-east-doc-conversion/organizations/
real 2m0.747s
user 0m0.076s
sys 0m0.030s
where as…
alxndrmlr@alxndrmlr-mbp $ time s3cmd -c .s3cfg-riakcs-admin ls
s3://bonfirehub-resources-can-east-doc-conversion/organizations/OrganizationID-1/documents/proposals
DIR
s3://bonfirehub-resources-can-east-doc-conversion/organizations/OrganizationID-1/documents/proposals/
real 0m10.262s
user 0m0.075s
sys 0m0.028s
The contents of this bucket contains a lot of very small files
(basically for each PDF we receive I split it to .JPG foreach page and
store them here. Based on the my latest counts it looks like we have
around *170,000* .JPG files in that bucket.
Now I’ve had a hunch this is just a fundamentally expensive operation
which exceeds the 5000ms response time threshold set in our HAProxy
config (which I raised during the video to illustrate what’s going
on). After reading
http://www.quora.com/Riak/Is-it-really-expensive-for-Riak-to-list-all-buckets-Why and
http://www.paperplanes.de/2011/12/13/list-all-of-the-riak-keys.html I’m feeling
like this is just a fundamental issue with the data structure in Riak.
Based on this I’m thinking that cost of this type of query is only
going to get worse over time as we add more keys to this bucket
(unless secondary indexes can be added). Or am I totally out to lunch
here and there’s some other underlying problem?
Bonfire Logo *Alex Millar*, CTO
Office: 1-800-354-8010 ext. 704 <tel:+18003548010>
Mobile: 519-729-2539 <tel:+15197292539>
*GoBonfire*.com <http://GoBonfire.com>
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