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href="#motivation" class="hash-link" aria-label="Direct link to Motivation" title="Direct link to Motivation"></a></h3><p>We have already abstracted all the metadata operations into interfaces. And all the bookkeeper implementations only reply on metadata interfaces, |
| rather than depending on zookeeper. This proposal is to organize the metadata interfaces and its implementations in a separate module and make |
| bookkeeper implementation only depends on metadata interfaces, not depends on zookeeper. This would a few benefits:</p><ul><li>It allows supporting different metadata storages, without bringing in dependencies of metadata store implementation directly into |
| bookkeeper-server module. The development of different metadata storage can be done without interleaving with each other.</li><li>It would define a clean module dependency between bookkeeper implementation and metadata api, and how bookkeeper load a different metadata |
| implementation.</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="public-interfaces">Public Interfaces<a href="#public-interfaces" class="hash-link" aria-label="Direct link to Public Interfaces" title="Direct link to Public Interfaces"></a></h3><p>A more generic setting <code>metadataServiceUri</code> is introduced for replacing implementation specific settings <code>zkServers</code> and <code>zkLedgersRootPath</code>.</p><p>A metadata service uri defines the location of a metadata storage. In zookeeper based implementation, the metadata service url will be |
| <code>zk://<zkServers>/<zkLedgersRootPath></code>.</p><p>This new setting in bookie configuration will be like as below:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">metadataServiceUri=zk://127.0.0.1/ledgers</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If we eventually support Etcd as one of the metadata storages. Then the setting in bookie configuration to use Etcd will be:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">metadataServiceUri=etcd://<etcd_servers>/<etcd_key_prefix></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="proposed-changes">Proposed Changes<a href="#proposed-changes" class="hash-link" aria-label="Direct link to Proposed Changes" title="Direct link to Proposed Changes"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="configuration">Configuration<a href="#configuration" class="hash-link" aria-label="Direct link to Configuration" title="Direct link to Configuration"></a></h4><p>This BP proposes introducing a more generic metadata setting <code>metadataServiceUri</code> to replace implementation specific settings |
| <code>zkServers</code> and <code>zkLedgersRootPath</code>. All implementation specific settings should be considered moving to implementation itself.</p><p>The <code>metadataServiceUri</code> can also be used for replacing the need of configuring <code>ledgerManagerFactoryClass</code>, <code>registrationClientClass</code> and |
| <code>registrationManagerClass</code>. It is unnecessarily complicated to configure multiple settings to load a specific metadata implementation. |
| We can just use the <code>scheme</code> field in <code>metadataServiceUri</code> to resolve which metadata implementation to use. Using uri to resolve |
| different driver or implementation is commonly seen at java world, for example, jdbc to support different database drivers. Also, distributedlog |
| uses this pattern to load different metadata driver.</p><p>So in zookeeper based metadata implementation, the metadata service uri can be:</p><ul><li><code>zk+flat://127.0.0.1/ledgers</code>: the scheme is "zk+flat". it means a zookeeper base metadata implementation and it uses flat ledger manager.</li><li><code>zk+hierarchical://127.0.0.1/ledgers</code>: the scheme is "zk+hierarchical". it means a zookeeper base metadata implementation and it |
| uses hierarchical ledger manager.</li><li><code>zk+longhierarchical://127.0.0.1/ledgers</code>: the scheme is "zk+longhierarchical". it means a zookeeper base metadata implementation and it |
| uses long hierarchical ledger manager.</li></ul><h4 class="anchor anchorWithStickyNavbar_LWe7" id="metadata-stores">Metadata Stores<a href="#metadata-stores" class="hash-link" aria-label="Direct link to Metadata Stores" title="Direct link to Metadata Stores"></a></h4><p>Introduce a new directory called <code>metadata-stores</code> for storing all the metadata related modules. Under this directory, it will have following modules:</p><ul><li><code>api</code>: it is the metadata api module <code>metadata-store-api</code>. It contains all the files defining the metadata interfaces.</li><li><code>zookeeper</code>: it is the zookeeper implementation module <code>metadata-store-zookeeper</code>. It contains all the files that implementing the metadata interfaces |
| using zookeeper.</li></ul><p>If a new metadata implementation is added, a new directory will be created under <code>metadata-stores</code> to contain the implementation. For example, if we |
| are adding <code>Etcd</code> as the metadata store. A <code>Etcd</code> directory will be created under <code>metadata-stores/etcd</code> to store the files that implement metadata |
| interfaces using etcd client. And its module is named as <code>metadata-store-etcd</code>.</p><p>We then change bookkeeper-server to depend on <code>metadata-store-api</code> only.</p><p>This approach is same as other pluggable modules <code>stats-api</code> and <code>http-server</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="compatibility-deprecation-and-migration-plan">Compatibility, Deprecation, and Migration Plan<a href="#compatibility-deprecation-and-migration-plan" class="hash-link" aria-label="Direct link to Compatibility, Deprecation, and Migration Plan" title="Direct link to Compatibility, Deprecation, and Migration Plan"></a></h3><p>No compatibility concern at this moment. New setting is introduced and old settings will still continue to work. |
| No immediate deprecation. |
| No migration is needed.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="test-plan">Test Plan<a href="#test-plan" class="hash-link" aria-label="Direct link to Test Plan" title="Direct link to Test Plan"></a></h3><p>This proposal is mostly around refactor. So existing test cases would cover this.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="rejected-alternatives">Rejected Alternatives<a href="#rejected-alternatives" class="hash-link" aria-label="Direct link to Rejected Alternatives" title="Direct link to Rejected Alternatives"></a></h3><p>N/A</p></article></div><div class="col col--2"><div class="tableOfContents_bqdL thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#motivation" class="table-of-contents__link toc-highlight">Motivation</a></li><li><a href="#public-interfaces" class="table-of-contents__link toc-highlight">Public Interfaces</a></li><li><a href="#proposed-changes" class="table-of-contents__link toc-highlight">Proposed Changes</a></li><li><a href="#compatibility-deprecation-and-migration-plan" class="table-of-contents__link toc-highlight">Compatibility, Deprecation, and Migration Plan</a></li><li><a href="#test-plan" class="table-of-contents__link toc-highlight">Test Plan</a></li><li><a href="#rejected-alternatives" class="table-of-contents__link toc-highlight">Rejected Alternatives</a></li></ul></div></div></div></main></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Documentation</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs/overview">Overview</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/getting-started/installation">Getting started</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/deployment/manual">Deployment</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/admin/bookies">Administration</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/api/overview">API</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/security/overview">Security</a></li><li 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