Add documentation for the dns ttl issue
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Key: JAMES-774
URL: https://issues.apache.org/jira/browse/JAMES-774
Project: James
Issue Type: Task
Affects Versions: 2.3.1-dev, Next Major
Reporter: Stefano Bagnara
Assigned To: Danny Angus
Add documentation to the site and/or to the config.xml about the unbounded
cache issue in the JVM and how we introduced a system property
networkaddress.cache.ttl that is read by phoenix at startup and used to
override the java 1.4 Security.setProperty("networkaddress.cache.ttl" value.
By default in run.bat, phoenix.sh and james-server.sh (this one only in trunk)
and wrapper.conf we added 300 seconds (-Dnetworkaddress.cache.ttl=300).
The cache is about positive results from dns lookups.
-1 means that the cache is never expired
0 means no cache
x>0 mean the number of seconds before expiration.
Please not that james trunk should not be affected by this cache because every
usage of the InetAddress lookups have been removed by core code, but third
party mailets could be afftected anyway, and this is why we added the property.
James 2.3 instead still uses some InetAddress lookup and this property will
save from OOM due to the unbounded cache.
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