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Item7879: VarCachePlugin may cause a topic rendered broken

Item Form Data

AppliesTo: Component: Priority: CurrentState: WaitingFor: TargetRelease ReleasedIn
Extension VarCachePlugin Normal Closed   n/a  

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Reported By:
Applies To:
Current State:
Waiting For:
Target Release:
Released In:


Under high load, VarCachePlugin may cause a page rendered broken. This is mainly because a cache file may be read before it's completely written. There is a possibility of multiple cache updates happen simultaneously and write to the same cache file at the same time. In addition, there is a possibility of a system crash while a cache file is being written. To cope with those situations, data to be cached needs to be written to a temporary file and then renamed. Both the cached data for the HTML body and the HTML head need to be renamed after both are written.

-- TWiki:Main/HideyoImazu - 2020-01-21

Summary VarCachePlugin may cause a topic rendered broken
ReportedBy TWiki:Main.HideyoImazu
Codebase ~twiki4
SVN Range TWiki-6.1.0-trunk, Thu, 29 Aug 2019, build 30672
AppliesTo Extension
Component VarCachePlugin
Priority Normal
CurrentState Closed

Checkins TWikirev:30721
TargetRelease n/a

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Topic revision: r4 - 2020-04-14 - HideyoImazu
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