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Re: [Subclipse-dev] New Subclipse release posted

From: Thomas Hallgren <thomas_at_tada.se>
Date: Tue, 03 Jun 2008 12:11:18 +0200

Thanks Andrew,
I'm on a x86_64 machine and I use 64-bit Java. I didn't find any
binaries for that. I tried compiling the source but ran into apr
incompatibility problems. Rather then divining in to that further, I
took another approach and tried to debug the SVNKit implementation.

I immediately ran into problems there too since the source found here:
http://subclipse.tigris.org/svn/subclipse/tags/subclipse/1.3.16/svnClientAdapter
doesn't compile. Apparently, the svnjavahl.jar that is bundled with the
source revision is incompatible with the source. I get compilation
errors such as:

"The method copy(CopySource[], String, String, boolean, boolean) in the
type SVNClientInterface is not applicable for the arguments
(CopySource[], String, String, boolean, boolean, null)"

One observation I made when looking at the code was that the
SVNClientManager is caching its instances so in spite of the method name
createSVNClient(), it actually returns the same instance every time.
This is probably not ideal since the client, at least in the SVNKit
implementation, doesn't appear to be thread safe. In fact, even if it
were, it would then have to serialize all accesses which would be really
bad, at least for us. We've found that in many cases, four simultaneous
threads operate almost four times faster then one.

Regards,
Thomas Hallgren

Andrew Vaughan wrote:
> Hi Thomas
>
> On Tuesday 03 June 2008 18:26, Thomas Hallgren wrote:
>
>> Hi Mark,
>> I tried this new release in Buckminster and ran into some fairly serious
>> problems that seems to stem from concurrency issues in the client
>> adapter.
>>
>> Buckminster normally performs resolution in multiple threads (four of
>> them typically) and each thread will read individual files from remote
>> SVN repositories using the ISVNClientAdapter.getContent() method. If I
>> limit the number of threads to one, everything works as expected but
>> without that limitation, I get strange errors such as files being
>> considered directories or incorrect content in files that I successfully
>> read. The 1.2.4 release does not have this problem.
>>
>> I'm using the SVNKit Beta at present as the threshold of getting JavaHL
>> 1.5.0RC7 to run seems a bit high. I can't even find it ;-)
>>
>
> Source
> http://subversion.tigris.org/servlets/NewsItemView?newsItemID=2119
>
> Binaries (Windows + Redhat)
> http://merge-tracking.open.collab.net/servlets/ProjectProcess;jsessionid=7E0ADF3D3F07B6234BEDD3C73DA464F1?pageID=3711
>
> HTH
> Andrew
>
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Received on 2008-06-03 12:11:26 CEST

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