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Norman Maurer 5650db5826
Add cache for CNAME mappings resolved during lookup of DNS entries. (#8314)
* Add cache for CNAME mappings resolved during lookup of DNS entries.

Motivation:

If the CNAMEd hostname is backed by load balancing component, typically the final A or AAAA DNS records have small TTL. However, the CNAME record itself is setup with longer TTL.

For example:
* x.netty.io could be CNAMEd to y.netty.io with TTL of 5 min
* A / AAAA records for y.netty.io has a TTL of 0.5 min

In current Netty implementation, original hostname is saved in resolved cached with the TTL of final A / AAAA records. When that cache entry expires, Netty recursive resolver sends at least two queries — 1st one to be resolved as CNAME record and the 2nd one to resolve the hostname in CNAME record.
If CNAME record was cached, only the 2nd query would be needed most of the time. 1st query would be needed less frequently.

Modifications:

Add a new CnameCache that will be used to cache CNAMEs and so may reduce queries.

Result:

Less queries needed when CNAME is used.
2018-09-27 17:05:35 +02:00
.github Use GitHub Issue/PR Template Feature 2016-12-07 11:40:26 -08:00
.mvn/wrapper Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
all [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
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buffer Directly init refCnt to 1 (#8274) 2018-09-07 19:04:19 +02:00
codec Ensure ByteToMessageDecoder.Cumulator implementations always release in buffer. (#8325) 2018-09-27 07:38:42 +02:00
codec-dns [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-haproxy [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-http Fix get charset from content-type header with multiple parameters (#8286) 2018-09-14 21:39:01 +02:00
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codec-mqtt Add headers to MqttMessage returned by MqttDecoder in case of DecoderException (#8219) 2018-08-31 15:06:09 +02:00
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codec-socks Fix incorrectly encoded empty SOCKS5 address (#8292) 2018-09-18 14:20:28 -07:00
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common Don't re-arm timerfd each epoll_wait (#7816) 2018-09-11 13:38:38 +02:00
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docker Add docker-compose config to run with Java12 (#8327) 2018-09-27 12:47:17 +02:00
example [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
handler Fix leak in SniClientJava8TestUtil (#8326) 2018-09-27 09:32:41 +02:00
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license Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
microbench Use a non-volatile read for ensureAccessible() whenever possible to reduce overhead and allow better inlining. (#8266) 2018-09-07 07:47:02 +02:00
resolver Allow to parse hosts file which is stored in a different encoding then the default system encoding. (#8211) 2018-08-24 19:48:27 +02:00
resolver-dns Add cache for CNAME mappings resolved during lookup of DNS entries. (#8314) 2018-09-27 17:05:35 +02:00
tarball [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
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transport NioEventLoop should also use our special SelectionKeySet on Java9 and later. (#8260) 2018-09-05 07:23:03 +02:00
transport-native-epoll Don't re-arm timerfd each epoll_wait (#7816) 2018-09-11 13:38:38 +02:00
transport-native-kqueue We should call the UnLoad methods when we detect an error during calling OnLoad (#8237) 2018-08-30 06:56:42 +02:00
transport-native-unix-common Allow to use native transports when sun.misc.Unsafe is not present on… (#8231) 2018-08-29 19:36:33 +02:00
transport-native-unix-common-tests [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
transport-rxtx [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
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.fbprefs Updated Find Bugs configuration 2009-03-04 10:33:09 +00:00
.gitattributes Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
.gitignore Add docker-sync files to .gitignore 2018-05-15 10:39:14 +02:00
CONTRIBUTING.md Move the pull request guide to the developer guide 2014-03-12 13:13:58 +09:00
LICENSE.txt Relicensed to Apache License v2 2009-08-28 07:15:49 +00:00
mvnw Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
mvnw.cmd Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
NOTICE.txt Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
pom.xml Add profile to be able to compile on java12 (#8321) 2018-09-26 20:01:53 +02:00
README.md Provide an Automatic-Module-Name for the netty-all artifact fixes #7644 2018-01-27 20:31:16 +01:00
run-example.sh Add UptimeServer and adjust UptimeClient's code style. 2017-04-28 07:41:07 +02:00

Netty Project

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

How to build

For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.

You require the following to build Netty:

Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+) is enough to run your Netty-based application.

Branches to look

Development of all versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.0 resides in the branch '3.9' and the branch '4.0' respectively.

Usage with JDK 9

Netty can be used in modular JDK9 applications as a collection of automatic modules. The module names follow the reverse-DNS style, and are derived from subproject names rather than root packages due to historical reasons. They are listed below:

  • io.netty.all
  • io.netty.buffer
  • io.netty.codec
  • io.netty.codec.dns
  • io.netty.codec.haproxy
  • io.netty.codec.http
  • io.netty.codec.http2
  • io.netty.codec.memcache
  • io.netty.codec.mqtt
  • io.netty.codec.redis
  • io.netty.codec.smtp
  • io.netty.codec.socks
  • io.netty.codec.stomp
  • io.netty.codec.xml
  • io.netty.common
  • io.netty.handler
  • io.netty.handler.proxy
  • io.netty.resolver
  • io.netty.resolver.dns
  • io.netty.transport
  • io.netty.transport.epoll (native omitted - reserved keyword in Java)
  • io.netty.transport.kqueue (native omitted - reserved keyword in Java)
  • io.netty.transport.unix.common (native omitted - reserved keyword in Java)
  • io.netty.transport.rxtx
  • io.netty.transport.sctp
  • io.netty.transport.udt

Automatic modules do not provide any means to declare dependencies, so you need to list each used module separately in your module-info file.