[xwiki-users] Attachment- and extension problems, with related documentation questions for latest stable release

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: [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. 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 - Are the documented java memory recommendations still applicable or should they be considered as outdated for latest stable?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" * 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? * 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#HSocialL…. 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+). - 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? 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. I will now try the long term support release hoping that I successfully can add attachments and install extensions according to my requirements. Best regards Johan Eriksson