[2014.03.02] Upgrade Issue @ Mediawiki

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When I upgrade the mediawiki, I find the error message is happened in two computers.
These computers both using xcache and the version are 3.0.4 above, the only one computer upgrde successfully with 3.0.1 version xcache .
I don't sure if the version is the root cause.



But, according to some threads, that issue may relate with the cache setiing, I force edit the parameter in both LocalSettings of mediawiki.

1. $wgMainCacheType = 'xcache';

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The upgrading steps seems work fine, but I think it still should need to double check the procedure of forcing editing the cache type is correct or failed step.

Before upgradeing


After upgrading


---------------------------reference---------------------------

1. http://www.mediawiki.org/wiki/Thread:Project:Support_desk/cannot_upgrade_to_1.18_from_1.17_-_APC_issue
   
2. http://www.mediawiki.org/wiki/Manual_talk:Cache

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