On 30 Aug 2015 at 15:15:45, vinc...@massol.net
(vinc...@massol.net(mailto:vinc...@massol.net)) wrote:
> Hi Johan,
>
> On 30 Aug 2015 at 14:40:38, Johan Eriksson
> (jo...@moulinsart.org(mailto:jo...@moulinsart.org)) wrote:
>
> > Hi!
> >
> > I performed my first install ever of xwiki today using the latest
> > stable. Running with mysql (on separate hosts) as database. I've
> > installed my servlet container on Centos 7, with java and tomcat
> > versions as below:
>
> What version of XWiki did you install? 7.1.2?
>
> > [root@tomcat-01]# java -version
> > java version "1.7.0_85"
> > OpenJDK Runtime Environment (rhel-2.6.1.2.el7_1-x86_64 u85-b01)
> > OpenJDK 64-Bit Server VM (build 24.85-b03, mixed mode)
> >
> > Installed Packages
> > Name : tomcat
> > Arch : noarch
> > Version : 7.0.54
> > Release : 2.el7_1
> >
> > Since this is my first xwiki installation ever, I would like to share my
> > experience, problems I faced and unanswered questions below.
>
> That’s great that you are doing so; this helps us improve XWiki and the
> documentation.
>
> > From http://platform.xwiki.org/xwiki/bin/view/AdminGuide/InstallationTomcat
> > I thought that as per example, java settings:
> >
> > JAVA_OPTS="-Xmx800m -XX:MaxPermSize=192m"
> >
> > would allow me to install and play around with the application, since
> > that recommendation is higher than the "small installation" (512M)
> > reference found here
> > http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Performances#HMemory
> >
> > * My first problem appeared when I right after successful installation,
> > in the sandbox, created an empty testpage with one attachment of 3M in
> > size. I got an OutOfMemory exception when deleting that attachment.
> > - Are the documented java memory recommendations still applicable or
> > should they be considered as outdated for latest stable?
> >
> > so I updated the java settings to solve the problem:
> > JAVA_OPTS="-Xmx1400m -XX:MaxPermSize=192m”
>
> So the memory requirements is indicated on
> http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Installation#HPrerequisites
>
>
> As you can see there, for medium installs we recommend -Xmx1024m
> -XX:MaxPermSize=196m (and -Xmx512m -XX:MaxPermSize=196m for small).
>
> Indeed in your case you should use the small install recommendation since at
> this stage it’s only to play with XWiki.
>
> Now your problem is with attachments. If you check
> http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Performances#HMemory
> you’ll see a warning box with explanations about the memory requirements and
> a link that leads you
> http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Attachments
>
> I’ve also checked
> http://platform.xwiki.org/xwiki/bin/view/AdminGuide/InstallationTomcat and it
> does point to the same memory doc as I referenced above, so normally you
> should have seen the issue with the memory required for large attachments.
>
> What we need to do in the future is enable the filesystem store by default
> but we currently have a limitation with it (as indicated on that page):
> "restoring attachments from the recycle bin via UI”. This is why we haven’t
> made it the default just yet.
>
> > * My second problem appeared when I created my first page. The intention
> > was to create a page with a bunch of image attachments, using an
> > extension for displaying these images as an image gallery. When
> > uploading 116 images of individual size ~ 3M, a total size of 374M.
> > Uploading of files failed after 80 something files had been uploaded to
> > the page. The disk space on the servlet container server host was full.
> > In
> > /var/cache/tomcat/work/Catalina/localhost/xwiki/xwiki-temp/attachment-cache
> > a total of 6.3G of data had been stored.
> > - Looking at the checksum of the 2000 something files stored in this
> > directory there are 86 unique files some of which stored in 29 copies
> > during the upload process. Is this a desired behavior of the attachment
> > cache, or is this a bug?
>
> We have performance problems when uploading attachments in the DB (it’s very
> memory-hungry) but I didn’t know that the temporary directory was used that
> much. This looks like a bug. It would be great if you could open a jira issue
> at http://jira.xwiki.org with your details so that we could look at this into
> more details.
>
> Now since you seem to be wanting to have a lot of attachments and possibly or
> large size, I’d highly recommend you turn on filesystem storage for
> attachments.
>
> > * My third problem was when trying to install an extension. I was really
> > curious about, and wanted to test, the social login application, that
> > even is referred to from the administration guide
> > http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Authentication#HSocialLogin.
> > This extension does not install at all on the latest stable. My java
> > knowledge is limited, but, I interpret the error message as failure to
> > satisfy requirement of servlet api version 2.5 (maybe since latest
> > stable xwiki has servlet version prereq of 3.0+).
>
> Unfortunately it seems you were not lucky and you picked one extension for
> which its author and the community have not updated to work on the latest
> version of XWiki :(
>
> As you can see on
> http://extensions.xwiki.org/xwiki/bin/view/Extension/Social+Login+Application
> this extension has been contributed by Jerome Velocity but this person is not
> active anymore on it AFAIK and I don’t know anyone else who’s active on it at
> the moment (although Thomas Mortagne seems to have fixed some issues and
> released the last version - see http://jira.xwiki.org/browse/AUTHSL).
>
> I’d suggest 2 things:
>
> 1) you rate it quite poorly at
> http://extensions.xwiki.org/xwiki/bin/view/Extension/Social+Login+Application
> so that others know what to expect. You can also help future users by
> commenting on
> http://extensions.xwiki.org/xwiki/bin/view/Extension/Social+Login+Application
> (or even editing the page if you’re logged in) to add the information about
> the fact that it doesn’t work with XWiki 7.x. EDIT: I’ve just added that
> information on the page (haven’t tested myself, I’ve based my edit on your
> feedback).
The truth is that we’re doing a bad job of separating high-quality extensions
that have been tested to work fine with latest versions with oldish extensions
either not working well or not of good quality. We’re relying on the community
to provide that information but it’s not working well so far. We need something
better. If you have some ideas, please let me know!
Thanks
-Vincent
> 2) you create a jira issue at http://jira.xwiki.org/browse/AUTHSL and maybe
> someone will pick it up and fix it.
>
> > - Since the documentation only exist in one latest version, should I as
> > user assume that the documentation is applicable for latest
> > development-, stable- or long term release?
>
> All documentation on xwiki.org(http://xwiki.org) is always for the latest
> version unless mentioned explicitly.
>
> > Now, it might be bad luck, or my failure to understand the xwiki release
> > process, that my first three tests of the software failed with problems.
>
> Yes I believe you were not lucky and I’m really sorry that XWiki didn’t make
> a good first impression as a result. Try to persevere a bit more and I’m sure
> it’ll go uphill from now on :)
>
> > I will now try the long term support release hoping that I successfully
> > can add attachments and install extensions according to my requirements.
>
> Most extensions should work fine with 7.1.2. You can also verify this by
> using extensions that have had recent versions released.
>
> Thanks a lot for your feedback! If you have more ideas on things we
> could/should do to improve the user experience, please share them here.
> You’ve already helped a lot with this report.
>
> Thanks
> -Vincent
>
>
> > Best regards
> > Johan Eriksson
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