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8304885: Reuse stale data to improve DNS resolver resiliency

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Reviewed-by: michaelm, dfuchs
This commit is contained in:
Sergey Bylokhov 2023-06-09 23:20:06 +00:00
parent beec734fdd
commit bdd81b3182
16 changed files with 461 additions and 87 deletions
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13
src/java.base/share/classes/java/net/doc-files/net-properties.html
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@ -1,6 +1,6 @@
<!DOCTYPE HTML>
<!--
Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 1998, 2023, Oracle and/or its affiliates. All rights reserved.
DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
This code is free software; you can redistribute it and/or modify it
@ -267,13 +267,22 @@ tuning on how the cache is operating.</P>
policy, while a value of 0 (zero) means no caching. The default value
is -1 (forever) if a security manager is installed, and implementation-specific
when no security manager is installed.</P>
<LI><P><B>{@systemProperty networkaddress.cache.stale.ttl}</B> (default: see below)<BR>
Value is an integer corresponding to the number of seconds that stale names
will be kept in the cache. A name is considered stale if the TTL has expired
and an attempt to lookup the host name again was not successful. This
property is useful if it is preferable to use a stale name rather than
fail due to an unsuccessful lookup.
A value of 0 (zero) or if the property is not set means do not use stale
names. Negative values are ignored.
The default value is implementation-specific.</P>
<LI><P><B>{@systemProperty networkaddress.cache.negative.ttl}</B> (default: {@code 10})<BR>
Value is an integer corresponding to the number of seconds an
unsuccessful name lookup will be kept in the cache. A value of -1,
or any negative value, means &ldquo;cache forever&rdquo;, while a
value of 0 (zero) means no caching.</P>
</UL>
<P>Since these 2 properties are part of the security policy, they are
<P>Since these 3 properties are part of the security policy, they are
not set by either the -D option or the {@code System.setProperty()} API,
instead they are set as security properties.</P>
<a id="Unixdomain"></a>