Yehuda,
I believe it would not be wise to increase the value of this
parameter; till the underlying threading model of RGW is fixed.
I tried with various 'rgw_thread_pool_size' (128,256,512,1024), and
didn't observe any better throughput , instead response time
increased. Which means RGW is not able to handled increased
concurrency.
I have another observation regarding 'rgw_max _chunk_size'. I was
doing some experiment with this parameter. I have seen the following
behavior on a test deployment and then verified on development
environment :-
1. Based on the value we set for 'rgw_max_chunk_size', every Swift
object gets sliced in to equal sized chunks and each chunk got created
as a RAODS Object in the pool (.rgw.buckets)
2. While reading the same Swift Object, sum of all RADOS objects provided.
3. However setting this 'rgw_max_chunk_size' value up to 4MB only
works after which GET request will fail and only the first RADOS
object will be returned.
#######################
$./ceph --admin-daemon out/client.admin.9660.asok config set
rgw_max_chunk_size 4195000
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
{ "success": "rgw_max_chunk_size = '4195000' "}
swift -A http://localhost:8000/auth -U tester:testing -K asdf upload
my4+MB_chunked ceph-0.85.tar.gz
ceph-0.85.tar.gz
ceph@Ubuntu14:~$ cd copy/
ceph@Ubuntu14:~/copy$ swift -A http://localhost:8000/auth -U
tester:testing -K asdf download my4+MB_chunked ceph-0.85.tar.gz
ceph-0.85.tar.gz: md5sum != etag, ea27d35584bae391e9f3e67c86849a66 !=
fd9237fa01803398bd8012c4d59975d8
ceph-0.85.tar.gz [auth 0.021s, headers 0.040s, total 30.045s, 0.140 MB/s]
ceph-0.85.tar.gz: read_length != content_length, 4194304 != 7384934
######################
Is this behavior sane? Why the Swift Object is chunked by default
based on this value. Should the decision to chunk the object be coming
from end-user? (Like Native Swift)
On Sat, Nov 15, 2014 at 9:48 PM, Yehuda Sadeh <[email protected]> wrote:
> On Sat, Nov 15, 2014 at 3:55 AM, Mustafa Muhammad
> <[email protected]> wrote:
>> On Sat, Nov 15, 2014 at 10:28 AM, Mustafa Muhammad
>> <[email protected]> wrote:
>>> Hi,
>>> I am using civetweb in my radosgw, if I use "rgw thread pool size"
>>> that is more than 1024, civetweb doesn't work.
>>> e.g.
>>> rgw thread pool size = 1024
>>> rgw frontends = "civetweb port=80"
>>>
>>> #ps aux -L | grep rados | wc -l
>>> 1096
>>>
>>> everything works fine
>>>
>>>
>>> If I use:
>>> rgw thread pool size = 1025
>>> rgw frontends = "civetweb port=80"
>>>
>>> # ps aux -L | grep rados | wc -l
>>> 43
>>>
>>> And http server is not listening.
>>>
>>> If I don't use civetweb:
>>> rgw thread pool size = 10240
>>>
>>> # ps aux -L | grep rados | wc -l
>>> 10278
>>>
>>> Regards
>>>
>>> Mustafa Muhammad
>>
>> I found the problem, it is hardcoded here:
>> https://github.com/ceph/civetweb/blob/master/src/civetweb.c
>> as:
>> #define MAX_WORKER_THREADS 1024
>>
>> I increased it to 20480 an compiled from source, problem solved.
>> I should we make a patch, right?
>
> Please do, preferably a github pull request. Also, if you could open a
> ceph tracker issue with the specific would be great.
>
> Thanks,
> Yehuda
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-Pushpesh
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