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Re: Merge ra-reuse-session branch to trunk or not?

From: Ivan Zhakov <ivan_at_visualsvn.com>
Date: Mon, 21 Sep 2015 12:53:18 +0300

On 21 September 2015 at 12:47, Branko Čibej <brane_at_apache.org> wrote:
> On 20.09.2015 09:40, Ivan Zhakov wrote:
>> On 20 September 2015 at 00:53, Branko Čibej <brane_at_apache.org> wrote:
>>> On 19.09.2015 19:20, Ivan Zhakov wrote:
>>>> On 19 September 2015 at 17:24, Ivan Zhakov <ivan_at_visualsvn.com> wrote:
>>>>> On 19 September 2015 at 14:03, Branko Čibej <brane_at_apache.org> wrote:
>>>>>> On 19.09.2015 13:12, Ivan Zhakov wrote:
>>>>>>> On 18 September 2015 at 12:49, Stefan Sperling <stsp_at_elego.de> wrote:
>>>>>>>> On Thu, Sep 17, 2015 at 05:41:41PM +0200, Ivan Zhakov wrote:
>>>>>>>>> That branch is complete and ready for merging, but I'm still not sure
>>>>>>>>> whether we should merge it or not.
>>>>>>>> I think we should merge it to trunk now.
>>>>>>>>
>>>>>>>> I don't think this branch can improve much further unless we start
>>>>>>>> exercising the code ourselves to see how well it's working for us.
>>>>>>>>
>>>>>>>> ANd I believe it's hard to tell whether these changes provide an
>>>>>>>> actual benefit in practice without running the code for a while.
>>>>>>>>
>>>>>>>> I like the debug and profiling functionality.
>>>>>>>> This should make it easy to tune the system going forward.
>>>>>>> Ok. It seems people here generally support 'reuse-ra-session' branch
>>>>>>> concept. So I'm going to merge this branch to trunk and see how it
>>>>>>> will work.
>>>>>> +1
>>>>> Merged to trunk in r1704048.
>>>>>
>>>> The r1704048 broke JavaHL tests.
>>>>
>>>> This happens because JavaHL bindings changes content of AUTH_BATON
>>>> field in svn_client_ctx_t between diferent svn_client_*() invocations.
>>>> While RA session in RA session pool references AUTH_BATON from first
>>>> invocation.
>>>>
>>>> The most interesting question is it allowed by our API or not?
>>> Unfortunately, I'd say it is because none of the API docs say otherwise.
>>> Or at least I can't find any.
>>>
>> I also couldn't find any of them :(
>>
>>>> If it's not allowed we just need to fix JavaHL to use the same AUTH_BATON.
>>> I think the most interesting question here is: why is JavaHL doing this
>>> in the first place? I have to confess I've no idea, offhand.
>>>
>> I also have no idea, but I was sort of hoping that you could provide
>> some insight on this part :)
>>
>> Anyway, as we are doing this kind of things ourselves in JavaHL, there
>> could be other API users that are also doing it, and we will probably
>> break them unless we revv the API.
>
> Here's one more data point that has nothing to do with JavaHL: The
> svn-x64-macosx-bdb builder started failing after the merge:
>
> https://ci.apache.org/builders/svn-x64-macosx-bdb/builds/253/steps/Test%20ra_local%2Bbdb/logs/faillog
>
Yup, I've seen it. This one seems to be caused by too many BDB handles
opened due parallel run or something. Anyway I'm currently working on
revertng r1704048: it's clear that code is not ready for prime time
and it's not obvious how to fix even known problems.

-- 
Ivan Zhakov
Received on 2015-09-21 11:53:48 CEST

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