https://bugzilla.wikimedia.org/show_bug.cgi?id=55632
Web browser: ---
Bug ID: 55632
Summary: UDP packet flooding possible with
maintenance/purgeChangedPages.php
Product: MediaWiki
Version: 1.22-git
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Maintenance scripts
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
Mobile Platform: ---
Mark has pointed out that the new maintenance/purgeChangedPages.php script
could saturate packet buffers in routers and switches if it sends a very large
number of UDP packets in a short period of time. The consequence of this would
be that some unknown number of packets are silently discarded due to buffer
overflow.
A suggested solution is to insert a small artificial delay before sending each
packet. Brandon suggested that a 10ms should be more than enough to prevent
buffer overflows. With that rate limit in place we would effectively throttle
the HTCP packet output to 100/s (360,000/hr). It's estimated that a 10K-item
purge would take ~17 minutes of wall clock time to complete and a 150K list
would take 25 minutes .
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