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| <h1 class="title">Apache BookKeeper 4.7.0 Release Notes</h1> |
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| <p>This is the tenth release of Apache BookKeeper!</p> |
| |
| <p>The 4.7.0 release incorporates hundreds of bug fixes, improvements, and features since previous major release, 4.6.0, |
| which was released four months ago. It is a big milestone in Apache BookKeeper community - Yahoo branch is fully merged |
| back to upstream, and Apache Pulsar (incubating) starts using official BookKeeper release for its upcoming 2.0 release.</p> |
| |
| <p>It is also the first release of Apache DistributedLog after it is merged as sub modules of Apache BookKeeper.</p> |
| |
| <p>Apache BookKeeper/DistributedLog users are encouraged to <a href="../../admin/upgrade">upgrade to 4.7.0</a>. The technical details of |
| this release are summarized below.</p> |
| |
| <h2 id="highlights">Highlights</h2> |
| |
| <p>The main features in 4.7.0 cover are around following areas:</p> |
| |
| <ul> |
| <li>Dependencies Changes</li> |
| <li>Public API</li> |
| <li>Security</li> |
| <li>DbLedgerStorage</li> |
| <li>Metadata API</li> |
| <li>Performance</li> |
| <li>Operations</li> |
| <li>Builds & Testing</li> |
| <li>Bug Fixes</li> |
| </ul> |
| |
| <h3 id="dependencies-changes">Dependencies Changes</h3> |
| |
| <p>Here is a list of dependencies changed in 4.7.0:</p> |
| |
| <ul> |
| <li><a href="http://jcommander.org/">JCommander</a> 1.48 is added as a dependency of bookkeeper-server module.</li> |
| <li><a href="http://rocksdb.org/">RocksDB</a> 5.8.6 is introduced as part of <code class="highlighter-rouge">DbLedgerStorage</code> as a dependency of bookkeeper-server module.</li> |
| <li><a href="https://datasketches.github.io/">DataSketches</a> 0.8.3 is introduced as a dependency of prometheus-metrics-provider module.</li> |
| <li>Upgrade <a href="https://github.com/google/guava">Guava</a> from <code class="highlighter-rouge">20.0</code> to <code class="highlighter-rouge">21.0</code>.</li> |
| </ul> |
| |
| <h3 id="public-api">Public API</h3> |
| |
| <p>There are multiple new client features introduced in 4.7.0. Here are two highlighted features:</p> |
| |
| <h4 id="fluent-api">Fluent API</h4> |
| |
| <p>The new fluent style APi is evolving in 4.7.0. All the methods in handlers are now having both async and sync methods. |
| See <a href="https://github.com/apache/bookkeeper/pull/1288">#1288</a> for more details</p> |
| |
| <h4 id="crc32c">CRC32C</h4> |
| |
| <p><code class="highlighter-rouge">circe-checksum</code> module is ported from Apache Pulsar to Apache BookKeeper, and CRC32C digest type is added as one digest type option. |
| The JNI based CRC32C in <code class="highlighter-rouge">circe-checksum</code> module provides excellent performance than existing CRC32 digest type. Users are encouraged |
| to start use CRC32C digest type.</p> |
| |
| <h3 id="security">Security</h3> |
| |
| <ul> |
| <li>New PEM format <code class="highlighter-rouge">X.509</code> certificates are introduced for TLS authentication. See <a href="https://github.com/apache/bookkeeper/pull/965">#965</a> for more details.</li> |
| <li>TLS related settings are converged into same settings as bookie server. See <a href="../../admin/upgrade">Upgrade Guide</a> for more details.</li> |
| </ul> |
| |
| <h3 id="dbledgerstorage">DbLedgerStorage</h3> |
| |
| <p><code class="highlighter-rouge">DbLedgerStorage</code> is a new ledger storage that introduced by Yahoo and now fully merged into Apache BookKeeper. It is fully compatible for both v2 and v3 |
| protocols and also support long polling. It uses <a href="http://rocksdb.org/">RocksDB</a> to store ledger index, which eliminates the needed of ledger index files and |
| reduces the number of open file descriptors and the amount of random IOs can occurs during flushing ledger index.</p> |
| |
| <h3 id="metadata-api">Metadata API</h3> |
| |
| <p>New serviceUri based metadata API is introduced as <a href="http://bookkeeper.apache.org/bps/BP-29-metadata-store-api-module">BP-29</a>. This metadata API provides the metadata |
| abstraction over ledger manager, registration service, allowing plugin different type of data stores as the metadata service.</p> |
| |
| <h3 id="performance">Performance</h3> |
| |
| <p>There are a lot for performance related bug fixes and improvements in 4.7.0. Some of the changes are highlighted as below:</p> |
| |
| <ul> |
| <li>Leverage netty object recycler to reduce object allocations</li> |
| <li>A bunch of contentions around locking are removed. E.g. <a href="https://github.com/apache/bookkeeper/pull/1321">#1321</a> <a href="https://github.com/apache/bookkeeper/pull/1292">#1292</a> <a href="https://github.com/apache/bookkeeper/pull/1258">#1258</a></li> |
| <li>Introduce priority thread pool for accepting high priority reads/writes. This allows high priority reads/writes such as ledger recovery operations can |
| succeed even bookies are overwhelmed. <a href="https://github.com/apache/bookkeeper/pull/898">#898</a></li> |
| <li>Reorder slow bookies in read sequence. <a href="https://github.com/apache/bookkeeper/pull/883">#883</a></li> |
| <li>Use atomic field updater and long adder to replace AtomicInteger/AtomicLong/AtomicReference in Dlog. <a href="https://github.com/apache/bookkeeper/pull/1299">#1299</a></li> |
| <li>DataSketches library is used for implementing prometheus provider. <a href="https://github.com/apache/bookkeeper/pull/1245">#1245</a></li> |
| </ul> |
| |
| <h3 id="operations">Operations</h3> |
| |
| <h3 id="bookieshell">BookieShell</h3> |
| |
| <p>There are are multiple new commands are added in BookieShell. Here are a few highlighted:</p> |
| |
| <ul> |
| <li><code class="highlighter-rouge">metaformat</code> is deprecated with two new commands <code class="highlighter-rouge">initnewcluster</code> and <code class="highlighter-rouge">nukeexistingcluster</code>. This separation provides better operability and reduces mistakes.</li> |
| <li><code class="highlighter-rouge">initbookie</code> command is introduced for initializing a new bookie. <code class="highlighter-rouge">bookieformat</code> keeps serving as the purpose of reformatting a bookie.</li> |
| </ul> |
| |
| <p>A new BookKeeper CLI is proposed in <a href="http://bookkeeper.apache.org/bps/BP-27-new-bookkeeper-cli">BP-27</a>. Some commands are already ported to new bookkeeper CLI. |
| The full list of shell commands will be fully ported to new bookkeeper CLI in next release.</p> |
| |
| <h3 id="readonly-mode-support">ReadOnly Mode Support</h3> |
| |
| <p>Operations are improved around readonly mode for handling bookkeeper outage situation. New settings are introduce allow entry log creation, high priority writes |
| even when bookies are readonly. See <a href="../../admin/upgrade">Upgrade Guide</a> to learn all newly added settings.</p> |
| |
| <h3 id="builds--testing">Builds & Testing</h3> |
| |
| <ul> |
| <li><a href="http://arquillian.org/">Arquillian</a> framework is introduced in 4.7.0 for backward compatibility and integration tests.</li> |
| <li>Both Java8 and Java9 are now supported for running bookkeeper.</li> |
| </ul> |
| |
| <h2 id="full-list-of-changes">Full list of changes</h2> |
| |
| <ul> |
| <li><a href="https://github.com/apache/bookkeeper/milestone/3?closed=1">https://github.com/apache/bookkeeper/milestone/3</a></li> |
| </ul> |
| |
| </section> |
| |
| |
| </div> |
| </div> |
| |
| <div class="column is-2 is-hidden-mobile"> |
| |
| |
| <div class="toc"> |
| <h2 class="title">Apache BookKeeper 4.7.0 Release Notes</h2> |
| <ul class="section-nav"> |
| <li class="toc-entry toc-h2"><a href="#highlights">Highlights</a> |
| <ul> |
| <li class="toc-entry toc-h3"><a href="#dependencies-changes">Dependencies Changes</a></li> |
| <li class="toc-entry toc-h3"><a href="#public-api">Public API</a> |
| <ul> |
| <li class="toc-entry toc-h4"><a href="#fluent-api">Fluent API</a></li> |
| <li class="toc-entry toc-h4"><a href="#crc32c">CRC32C</a></li> |
| </ul> |
| </li> |
| <li class="toc-entry toc-h3"><a href="#security">Security</a></li> |
| <li class="toc-entry toc-h3"><a href="#dbledgerstorage">DbLedgerStorage</a></li> |
| <li class="toc-entry toc-h3"><a href="#metadata-api">Metadata API</a></li> |
| <li class="toc-entry toc-h3"><a href="#performance">Performance</a></li> |
| <li class="toc-entry toc-h3"><a href="#operations">Operations</a></li> |
| <li class="toc-entry toc-h3"><a href="#bookieshell">BookieShell</a></li> |
| <li class="toc-entry toc-h3"><a href="#readonly-mode-support">ReadOnly Mode Support</a></li> |
| <li class="toc-entry toc-h3"><a href="#builds--testing">Builds & Testing</a></li> |
| </ul> |
| </li> |
| <li class="toc-entry toc-h2"><a href="#full-list-of-changes">Full list of changes</a></li> |
| </ul> |
| </div> |
| |
| |
| |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| <div id="entry-popover-html" class="popover-template"> |
| <p>An entry is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Entries are also known as records.</p> |
| |
| </div> |
| |
| <div id="ledger-popover-html" class="popover-template"> |
| <p>A ledger is a sequence of entries written to BookKeeper. Entries are written sequentially to ledgers and at most once, giving ledgers append-only semantics.</p> |
| |
| </div> |
| |
| <div id="bookie-popover-html" class="popover-template"> |
| <p>A bookie is an individual BookKeeper storage server.</p> |
| |
| <p>Bookies store the content of ledgers and act as a distributed ensemble.</p> |
| |
| </div> |
| |
| <div id="rereplication-popover-html" class="popover-template"> |
| <p>A subsystem that runs in the background on bookies to ensure that ledgers are fully replicated even if one bookie from the ensemble is down.</p> |
| |
| </div> |
| |
| <div id="striping-popover-html" class="popover-template"> |
| <p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p> |
| |
| <p>Striping is essential to ensuring fast performance.</p> |
| |
| </div> |
| |
| <div id="striped-popover-html" class="popover-template"> |
| <p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p> |
| |
| <p>Striping is essential to ensuring fast performance.</p> |
| |
| </div> |
| |
| <div id="journal-popover-html" class="popover-template"> |
| <p>A journal file stores BookKeeper transaction logs.</p> |
| |
| </div> |
| |
| <div id="fencing-popover-html" class="popover-template"> |
| <p>When a reader forces a ledger to close, preventing any further entries from being written to the ledger.</p> |
| |
| </div> |
| |
| <div id="record-popover-html" class="popover-template"> |
| <p>A record is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Records are also known as entries.</p> |
| |
| </div> |
| |
| |
| <script type="text/javascript"> |
| |
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| </script> |
| |
| </main> |
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| <footer class="footer"> |
| <div class="container"> |
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| <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. |
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