[
https://issues.apache.org/jira/browse/TS-4723?focusedWorklogId=26280&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-26280
]
ASF GitHub Bot logged work on TS-4723:
--------------------------------------
Author: ASF GitHub Bot
Created on: 10/Aug/16 15:05
Start Date: 10/Aug/16 15:05
Worklog Time Spent: 10m
Work Description: Github user SolidWallOfCode commented on a diff in the
pull request:
https://github.com/apache/trafficserver/pull/843#discussion_r74262675
--- Diff: plugins/experimental/carp/CarpHashAlgorithm.cc ---
@@ -0,0 +1,396 @@
+/** @file
+
+ Implements the CARP hash algorithm
+
+ @section license License
+
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements. See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership. The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+#include <ts/ts.h>
+#include <stdio.h>
+#include <memory.h>
+#include <list>
+
+#include <iostream>
+#include <sstream>
+
+#include "Common.h"
+#include "CarpHashAlgorithm.h"
+
+using namespace std;
+
+/*****************************************************************/
+void
+HashNode::dump(string& s)
+{
+ stringstream ss;
+ string sSockaddr;
+ getStringFromSockaddr(reinterpret_cast<const struct sockaddr *>(
&forwardAddr), sSockaddr);
+
+ ss << scheme << "://" << name << ":"<<listenPort<<" ("<<sSockaddr<<")
weight:"<<weight<< (_status ? string(" UP ") : string(" DOWN "));
+ if(_statusTime) {
+ ss << "(" << time(NULL)-_statusTime<< "s ago in "<< _statusLatencyMs
<< "mS)";
+ }
+ ss << " hits:" << _hits;
+ ss << " carp_noforwarded:" << _carp_noforwarded;
+ ss << " carp_forwarded:" << _carp_forwarded;
+ ss << endl;
+ s += ss.str();
+}
+
+/*****************************************************************/
+void
+HashAlgorithm::addHost(std::string name, unsigned int port, std::string
scheme, double weight, bool self, struct sockaddr_storage fwdAddr)
--- End diff --
Pass `string` by `const&` where possible.
Issue Time Tracking
-------------------
Worklog Id: (was: 26280)
Time Spent: 2h 40m (was: 2.5h)
> 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
> Fix For: 7.0.0
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> 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)
