| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>Apache BookKeeper™ - BP-26: Move distributedlog library as part of bookkeeper</title> |
| |
| <meta charset="utf-8"> |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| |
| <link rel="stylesheet" href="/css/normalize.css"> |
| <link rel="stylesheet" href="/css/tippy.css"> |
| <link rel="stylesheet" href="/css/style.css"> |
| |
| <link rel="shortcut icon" href="/img/favicon.ico"> |
| |
| <script src="/js/tippy.min.js"></script> |
| |
| <script type="text/javascript"> |
| var shiftWindow = function() { scrollBy(0, -25); }; |
| window.addEventListener("hashchange", shiftWindow); |
| window.addEventListener("pageshow", shiftWindow); |
| function load() { if (window.location.hash) shiftWindow(); } |
| </script> |
| </head> |
| <body class="body"> |
| <main class="main"> |
| |
| <nav class="navbar bk-topnav"> |
| <div class="navbar-brand"> |
| <a class="navbar-item bk-brand" href="/"> |
| Apache BookKeeper™ |
| </a> |
| |
| <div class="navbar-burger burger" data-target="bkNav"> |
| <span></span> |
| <span></span> |
| <span></span> |
| </div> |
| </div> |
| |
| <div id="bkNav" class="navbar-menu"> |
| <div class="navbar-start"> |
| <div class="navbar-item has-dropdown is-hoverable"> |
| <a class="navbar-link">Documentation</a> |
| <div class="navbar-dropdown is-boxed"> |
| <a class="navbar-item" href="/docs/latest/overview/overview"> |
| Version 4.15.0-SNAPSHOT |
| <span class="tag is-warning">Development</span> |
| </a> |
| <a class="navbar-item" href="/docs/latest/api/javadoc"> |
| <span class="icon bk-javadoc-icon"> |
| <img src="/img/java-icon.svg"> |
| </span> |
| Javadoc |
| </a> |
| <hr class="dropdown-divider"> |
| |
| <a class="navbar-item" href="/docs/4.14.0/overview/overview"> |
| Release 4.14.0 |
| |
| </a> |
| |
| <a class="navbar-item" href="/docs/4.13.0/overview/overview"> |
| Release 4.13.0 |
| |
| </a> |
| |
| <a class="navbar-item" href="/docs/4.12.1/overview/overview"> |
| Release 4.12.1 |
| |
| </a> |
| |
| <a class="navbar-item" href="/docs/4.12.0/overview/overview"> |
| Release 4.12.0 |
| |
| </a> |
| |
| <a class="navbar-item" href="/docs/4.11.1/overview/overview"> |
| Release 4.11.1 |
| |
| <span class="tag is-success">Stable</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/docs/4.11.0/overview/overview"> |
| Release 4.11.0 |
| |
| </a> |
| |
| <a class="navbar-item" href="/docs/4.10.0/overview/overview"> |
| Release 4.10.0 |
| |
| </a> |
| |
| |
| <a class="navbar-item" href="/archives/docs/r4.9.2"> |
| Release 4.9.2 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.9.1"> |
| Release 4.9.1 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.9.0"> |
| Release 4.9.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.8.2"> |
| Release 4.8.2 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.8.1"> |
| Release 4.8.1 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.8.0"> |
| Release 4.8.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.7.3"> |
| Release 4.7.3 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.7.2"> |
| Release 4.7.2 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.7.1"> |
| Release 4.7.1 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.7.0"> |
| Release 4.7.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.6.2"> |
| Release 4.6.2 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.6.1"> |
| Release 4.6.1 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.6.0"> |
| Release 4.6.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.5.1"> |
| Release 4.5.1 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.5.0"> |
| Release 4.5.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.4.0"> |
| Release 4.4.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.3.2"> |
| Release 4.3.2 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.3.1"> |
| Release 4.3.1 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.3.0"> |
| Release 4.3.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.2.4"> |
| Release 4.2.4 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.2.3"> |
| Release 4.2.3 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.2.2"> |
| Release 4.2.2 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.2.1"> |
| Release 4.2.1 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.2.0"> |
| Release 4.2.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.1.0"> |
| Release 4.1.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| <a class="navbar-item" href="/archives/docs/r4.0.0"> |
| Release 4.0.0 |
| |
| <span class="tag is-warning">EOL</span> |
| |
| </a> |
| |
| </div> |
| </div> |
| |
| <div class="navbar-item has-dropdown is-hoverable"> |
| <a class="navbar-link">Community</a> |
| <div class="navbar-dropdown is-boxed"> |
| <a class="navbar-item" href="/community/mailing-lists">Mailing lists</a> |
| <a class="navbar-item" href="/community/slack">Slack</a> |
| <a class="navbar-item" href="https://github.com/apache/bookkeeper/issues">Github Issues</a> |
| <a class="navbar-item" href="/community/releases">Release Management</a> |
| <a class="navbar-item" href="/community/meeting">Community Meetings</a> |
| <hr class="dropdown-divider"> |
| <a class="navbar-item" href="/community/contributing">Contribution Guide</a> |
| <a class="navbar-item" href="/community/coding_guide">Coding Guide</a> |
| <a class="navbar-item" href="/community/testing">Testing Guide</a> |
| <a class="navbar-item" href="/community/issue-report">Issue Report Guide</a> |
| <a class="navbar-item" href="/community/release_guide">Release Guide</a> |
| <hr class="dropdown-divider"> |
| <a class="navbar-item" href="/community/presentations">Presentations</a> |
| <a class="navbar-item" href="/community/bookkeeper_proposals">BookKeeper Proposals</a> |
| </div> |
| </div> |
| |
| <div class="navbar-item has-dropdown is-hoverable"> |
| <a class="navbar-link">Project</a> |
| <div class="navbar-dropdown is-boxed"> |
| <a class="navbar-item" href="/project/who">Who are we?</a> |
| <a class="navbar-item" href="/project/bylaws">Bylaws</a> |
| <a class="navbar-item" href="http://www.apache.org/licenses/">License</a> |
| <hr class="dropdown-divider"> |
| <a class="navbar-item" href="/project/privacy">Privacy policy</a> |
| <a class="navbar-item" href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</a> |
| <a class="navbar-item" href="http://www.apache.org/foundation/thanks.html">Thanks</a> |
| </div> |
| </div> |
| </div> |
| |
| <div class="navbar-end"> |
| <div class="navbar-item"> |
| <div class="field is-grouped"> |
| <p class="control"> |
| <a class="button bk-twitter" href="https://twitter.com/asfbookkeeper"> |
| <span class="icon"> |
| <i class="fa fa-twitter"></i> |
| </span> |
| <span>Twitter</span> |
| </a> |
| </p> |
| <p class="control"> |
| <a class="button" href="https://github.com/apache/bookkeeper"> |
| <span class="icon"> |
| <i class="fa fa-github"></i> |
| </span> |
| <span>GitHub</span> |
| </a> |
| </p> |
| <p class="control"> |
| <a class="button is-primary" href="/releases"> |
| <span class="icon"> |
| <i class="fa fa-download"></i> |
| </span> |
| <span>Download</span> |
| </a> |
| </p> |
| </div> |
| </div> |
| </div> |
| </div> |
| </nav> |
| |
| |
| <div class="bk-community-container"> |
| <div class="columns"> |
| <div class="column is-12"> |
| <header class="docs-title"> |
| <nav class="level"> |
| <div class="level-left"> |
| <div class="level-item"> |
| <h1 class="title">BP-26: Move distributedlog library as part of bookkeeper</h1> |
| </div> |
| </div> |
| |
| </nav> |
| |
| |
| </header> |
| |
| <hr /> |
| |
| <div class="content is-medium"> |
| <section class="bk-community-content"> |
| <h3 id="motivation">Motivation</h3> |
| |
| <p>DistributedLog is an extension of Apache BookKeeper, which offers <em>reopenable</em> log streams as its storage primitives. |
| It is tightly built over bookkeeper ledgers, and provides an easier-to-use abstraction and api to use. Applications |
| can use <em>named</em> log streams rather than <em>numbered</em> ledgers to store their data. For example, users can use log streams |
| as files to storge objects, checkpoints and other more general filesystem related use cases.</p> |
| |
| <p>Moving the distributedlog core library as part of bookkeeper would have following benefits:</p> |
| |
| <ul> |
| <li>It provides more generic “reopenable” log abstraction. It lowers the barrier for people to use bookkeeper to store |
| data, and bring in more use cases into bookkeeper ecosystem.</li> |
| <li>Using ledgers to build continous log stream has been a pattern that been reimplemented multiple times at multiple places, |
| from older projects like HDFS namenode log manager, Hedwig to the newer projects like DistributedLog and Pulsar.</li> |
| <li>Most of the distributedlog usage is using the distributedlog library which only depends Apache BookKeeper and there is no |
| additional components introduced. To simplify those usages, it is better to release distributedlog library along with |
| bookkeeper. It provides a better integration and release procedure.</li> |
| </ul> |
| |
| <p>This proposal proposes “moving the distributedlog library code base as part of bookkeeper and continuing the library |
| development in bookkeeper”.</p> |
| |
| <h3 id="public-interfaces">Public Interfaces</h3> |
| |
| <p>This is a new library moved in bookkeeper. It will <em>NOT</em> touch any existing bookkeeper modules and ledger api.</p> |
| |
| <h3 id="proposed-changes">Proposed Changes</h3> |
| |
| <p>This proposal will <em>ONLY</em> move following library-only modules from distributedlog repo:</p> |
| |
| <ul> |
| <li>distributedlog-core: the log stream library that build over bookkeeper ledgr api. It doesn’t introduce any service components. Library only.</li> |
| <li>distributedlog-io/dlfs: A hdfs filesystem api wrapper over the log stream api, to provide filesystem-like usage over bookkeeper.</li> |
| </ul> |
| |
| <p>This proposal will <em>NOT</em> move other service components like “distributedlog-proxy”.</p> |
| |
| <p>The steps to make this change are described as following:</p> |
| |
| <ul> |
| <li>the proposed modules (<code class="highlighter-rouge">distributedlog-core</code> and <code class="highlighter-rouge">distributedlog-io/dlfs</code>) will be moved under <code class="highlighter-rouge">stream/distributedlog</code> directory at apache bookkeeper repo.</li> |
| <li>a new “stream” profile will be added to the root <code class="highlighter-rouge">pom.xml</code> file. The distributedlog module will only be build when “-Pstream” is specified |
| in the maven build command. This allows users who only use ledger api skip building distributedlog module.</li> |
| <li>the distributedlog api, javadoc api and some tutorials will be integrated with current bookkeeper website to provide integrated experiences |
| when users browse bookkeeper website.</li> |
| </ul> |
| |
| <h3 id="compatibility-deprecation-and-migration-plan">Compatibility, Deprecation, and Migration Plan</h3> |
| |
| <p>This doesn’t change existing modules or api. so no compatibility, deprecation and migration plan for bookkeeper users.</p> |
| |
| <p>For distributedlog users, the distributedlog library will begin release under groupId <code class="highlighter-rouge">org.apache.bookkeeper</code> instead of <code class="highlighter-rouge">org.apache.distributedlog</code>. |
| API documentation will be updated to reflect this.</p> |
| |
| <h3 id="test-plan">Test Plan</h3> |
| |
| <p>N/A</p> |
| |
| <h3 id="rejected-alternatives">Rejected Alternatives</h3> |
| |
| <p>N/A</p> |
| |
| </section> |
| |
| |
| </div> |
| </div> |
| </div> |
| </div> |
| </main> |
| |
| <footer class="footer"> |
| <div class="container"> |
| <div class="content has-text-centered"> |
| <p> |
| Copyright © 2016 - 2021 <a href="https://www.apache.org/">The Apache Software Foundation</a>,<br /> licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, version 2.0</a>. |
| </p> |
| <p> |
| Apache BookKeeper, BookKeeper®, Apache®, the Apache feature logo, and the Apache BookKeeper logo are either registered trademarks or trademarks of The Apache Software Foundation. |
| </p> |
| </div> |
| </div> |
| </footer> |
| |
| </body> |
| |
| <script src="/js/app.js"></script> |
| |
| |
| <!-- |
| 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. |
| --> |
| <script> |
| (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ |
| (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), |
| m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) |
| })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); |
| |
| ga('create', 'UA-104419626-1', 'auto'); |
| ga('send', 'pageview'); |
| |
| </script> |
| |
| |
| </html> |
