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Eric Schwartz reassigned TS-4723: --------------------------------- Assignee: Eric Schwartz > ATS CARP Plugin > --------------- > > Key: TS-4723 > URL: https://issues.apache.org/jira/browse/TS-4723 > Project: Traffic Server > Issue Type: New Feature > Components: Plugins > Reporter: Eric Schwartz > Assignee: Eric Schwartz > > Open sourcing this plugin we use internally within Yahoo in place of > hierarchical caching. > CARP is a plugin that allows you to group a bunch of ATS hosts into a cluster > and share cache space across the entire group. This is done with consistent > hashing on the object URL to generate an "owner" node in the cluster. > Requests to any other node in the cluster will be forwarded on to the > corresponding owner. More info in the README. > Difference from internal version of note: > I've ripped out some code we weren't entirely sure we could open source > because of a hash function. If it turns out that we can open source this, > I'll do so. The CarpHashAlgorithm class is meant to be extensible, so any > consistent hash function can replace it. The function included here is pretty > straightforward but not what we use in production, so just wanted to use that > caveat. > One last caveat: > You'll see some code and documentation in here for object replication. This > is something I added recently to CARP that allows you to specify an object be > replicated a certain number of times in the cluster. This is useful if you > have a network partition or if you're performing some sort of update. When an > object's primary owner is unreachable, a node in the cluster can go to the > secondary owner if it's available rather than having to fall all the way back > to origin. While I've done some initial testing on this with my own cluster > of hosts, it's not been tested in production so use at your own risk for now. > I'll be sure to keep the open source community informed on the progress of > our tests with this feature. -- This message was sent by Atlassian JIRA (v6.3.4#6332)