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page</button></div><div class="theme-doc-markdown markdown"><header><h1>The Advanced Ledger API</h1></header><p>In release <code>4.5.0</code>, Apache BookKeeper introduces a few advanced API for advanced usage. |
| This sections covers these advanced APIs.</p><blockquote><p>Before learn the advanced API, please read <a href="/docs/4.6.2/api/ledger-api">Ledger API</a> first.</p></blockquote><h2 class="anchor anchorWithStickyNavbar_LWe7" id="ledgerhandleadv">LedgerHandleAdv<a href="#ledgerhandleadv" class="hash-link" aria-label="Direct link to LedgerHandleAdv" title="Direct link to LedgerHandleAdv"></a></h2><p><a href="https://bookkeeper.apache.org//docs/latest/api/javadoc/org/apache/bookkeeper/client/LedgerHandleAdv" target="_blank" rel="noopener noreferrer"><code>LedgerHandleAdv</code></a> is an advanced extension of <a href="https://bookkeeper.apache.org//docs/latest/api/javadoc/org/apache/bookkeeper/client/LedgerHandle" target="_blank" rel="noopener noreferrer"><code>LedgerHandle</code></a>. |
| It allows user passing in an <code>entryId</code> when adding an entry.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="creating-advanced-ledgers">Creating advanced ledgers<a href="#creating-advanced-ledgers" class="hash-link" aria-label="Direct link to Creating advanced ledgers" title="Direct link to Creating advanced ledgers"></a></h3><p>Here's an exmaple:</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">byte[] passwd = "some-passwd".getBytes();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">LedgerHandleAdv handle = bkClient.createLedgerAdv(</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 3, 3, 2, // replica settings</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> DigestType.CRC32,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> passwd);</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>You can also create advanced ledgers asynchronously.</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">class LedgerCreationCallback implements AsyncCallback.CreateCallback {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public void createComplete(int returnCode, LedgerHandle handle, Object ctx) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> System.out.println("Ledger successfully created");</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">client.asyncCreateLedgerAdv(</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 3, // ensemble size</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 3, // write quorum size</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 2, // ack quorum size</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> BookKeeper.DigestType.CRC32,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> password,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> new LedgerCreationCallback(),</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> "some context"</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">);</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>Besides the APIs above, BookKeeper allows users providing <code>ledger-id</code> when creating advanced ledgers.</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">long ledgerId = ...; // the ledger id is generated externally.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">byte[] passwd = "some-passwd".getBytes();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">LedgerHandleAdv handle = bkClient.createLedgerAdv(</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ledgerId, // ledger id generated externally</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 3, 3, 2, // replica settings</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> DigestType.CRC32,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> passwd);</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><blockquote><p>Please note, it is users' responsibility to provide a unique ledger id when using the API above. |
| If a ledger already exists when users try to create an advanced ledger with same ledger id, |
| a <a href="https://bookkeeper.apache.org//docs/latest/api/javadoc/org/apache/bookkeeper/client/BKException.BKLedgerExistException.html" target="_blank" rel="noopener noreferrer">LedgerExistsException</a> is thrown by the bookkeeper client.</p></blockquote><h3 class="anchor anchorWithStickyNavbar_LWe7" id="add-entries">Add Entries<a href="#add-entries" class="hash-link" aria-label="Direct link to Add Entries" title="Direct link to Add Entries"></a></h3><p>The normal <a href="/docs/4.6.2/api/ledger-api/#adding-entries-to-ledgers">add entries api</a> in advanced ledgers are disabled. Instead, when users want to add entries |
| to advanced ledgers, an entry id is required to pass in along with the entry data when adding an entry.</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">long entryId = ...; // entry id generated externally</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">ledger.addEntry(entryId, "Some entry data".getBytes());</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>A few notes when using this API:</p><ul><li>The entry id has to be non-negative.</li><li>Clients are okay to add entries out of order.</li><li>However, the entries are only acknowledged in a monotonic order starting from 0.</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="read-entries">Read Entries<a href="#read-entries" class="hash-link" aria-label="Direct link to Read Entries" title="Direct link to Read Entries"></a></h3><p>The read entries api in advanced ledgers remain same as <a href="/docs/4.6.2/api/ledger-api/#reading-entries-from-ledgers">normal ledgers</a>.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/4.6.2/api/ledger-api"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">The Ledger API</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/4.6.2/api/distributedlog-api"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">DistributedLog</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#ledgerhandleadv" class="table-of-contents__link toc-highlight">LedgerHandleAdv</a><ul><li><a href="#creating-advanced-ledgers" class="table-of-contents__link toc-highlight">Creating advanced ledgers</a></li><li><a href="#add-entries" class="table-of-contents__link toc-highlight">Add Entries</a></li><li><a href="#read-entries" 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