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From jdcry...@apache.org
Subject [02/46] incubator-kudu git commit: Update docs and site for 0.7.0 release
Date Fri, 26 Feb 2016 21:22:50 GMT
http://git-wip-us.apache.org/repos/asf/incubator-kudu/blob/906def4c/releases/0.7.0/docs/release_notes.html
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+---
+title: Apache Kudu (incubating) Release Notes
+layout: default
+active_nav: docs
+last_updated: 'Last updated 2016-02-16 12:58:03 SAST'
+---
+<!--
+
+Licensed 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.
+-->
+
+
+<div class="container">
+  <div class="row">
+    <div class="col-md-9">
+
+<h1>Apache Kudu (incubating) Release Notes</h1>
+      <div class="sect1">
+<h2 id="_introducing_kudu"><a class="link" href="#_introducing_kudu">Introducing Kudu</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Kudu is a columnar storage manager developed for the Hadoop platform. Kudu shares
+the common technical properties of Hadoop ecosystem applications: it runs on
+commodity hardware, is horizontally scalable, and supports highly available operation.</p>
+</div>
+<div class="paragraph">
+<p>Kudu’s design sets it apart. Some of Kudu’s benefits include:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Fast processing of OLAP workloads.</p>
+</li>
+<li>
+<p>Integration with MapReduce, Spark, and other Hadoop ecosystem components.</p>
+</li>
+<li>
+<p>Tight integration with Apache Impala (incubating), making it a good, mutable alternative to
+using HDFS with Parquet. See <a href="kudu_impala_integration.html">Kudu Impala Integration</a>.</p>
+</li>
+<li>
+<p>Strong but flexible consistency model.</p>
+</li>
+<li>
+<p>Strong performance for running sequential and random workloads simultaneously.</p>
+</li>
+<li>
+<p>Efficient utilization of hardware resources.</p>
+</li>
+<li>
+<p>High availability. Tablet Servers and Masters use the Raft Consensus Algorithm.
+Given a replication factor of <code>2f+1</code>, if <code>f</code> tablet servers serving a given tablet
+fail, the tablet is still available.</p>
+<div class="admonitionblock note">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-note" title="Note"></i>
+</td>
+<td class="content">
+High availability for masters is not supported during the public beta.
+</td>
+</tr>
+</table>
+</div>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>By combining all of these properties, Kudu targets support for families of
+applications that are difficult or impossible to implement on current-generation
+Hadoop storage technologies.</p>
+</div>
+<div class="sect2">
+<h3 id="rn_0.7.0"><a class="link" href="#rn_0.7.0">Release notes specific to 0.7.0</a></h3>
+<div class="paragraph">
+<p>Kudu 0.7.0 is the first release done as part of the Apache Incubator and includes a number
+of changes, new features, improvements, and fixes.</p>
+</div>
+<div class="paragraph">
+<p>See also <a href="https://issues.cloudera.org/issues/?jql=project%20%3D%20Kudu%20AND%20status%20in%20
+(Resolved)%20AND%20fixVersion%20%3D%200.7.0%20ORDER%20BY%20key%20ASC">JIRAs resolved
+for Kudu 0.7.0</a> and <a href="https://github.com/apache/incubator-kudu/compare/branch-0.6.0...branch-0.7.0">Git
+changes between 0.6.0 and 0.7.0</a>.</p>
+</div>
+<div class="sect3">
+<h4 id="rn_0.7.0_incompatible_changes"><a class="link" href="#rn_0.7.0_incompatible_changes">Incompatible changes</a></h4>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p>The C++ client includes a new API, <code>KuduScanBatch</code>, which performs better when a
+large number of small rows are returned in a batch. The old API of <code>vector&lt;KuduRowResult&gt;</code>
+is deprecated.</p>
+<div class="admonitionblock note">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-note" title="Note"></i>
+</td>
+<td class="content">
+This change is API-compatible but <strong>not</strong> ABI-compatible.
+</td>
+</tr>
+</table>
+</div>
+</li>
+<li>
+<p>The default replication factor has been changed from 1 to 3. Existing tables will
+continue to use the replication factor they were created with. Applications that create
+tables may not work properly if they assume a replication factor of 1 and fewer than
+3 replicas are available. To use the previous default replication factor, start the
+master with the configuration flag <code>--default_num_replicas=1</code>.</p>
+</li>
+<li>
+<p>The Python client has been completely rewritten, with a focus on improving code
+quality and testing. The read path (scanners) has been improved by adding many of
+the features already supported by the C++ and Java clients. The Python client is no
+longer considered experimental.</p>
+</li>
+</ol>
+</div>
+</div>
+<div class="sect3">
+<h4 id="rn_0.7.0_new_features"><a class="link" href="#rn_0.7.0_new_features">New features</a></h4>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p>With the goal of Spark integration in mind, a new <code>kuduRDD</code> API has been added,
+which wraps <code>newAPIHadoopRDD</code> and includes a default source for Spark SQL.</p>
+</li>
+</ol>
+</div>
+</div>
+<div class="sect3">
+<h4 id="rn_0.7.0_improvements"><a class="link" href="#rn_0.7.0_improvements">Improvements</a></h4>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p>The Java client includes new methods <code>countPendingErrors()</code> and
+<code>getPendingErrors()</code> on <code>KuduSession</code>. These methods allow you to count and
+retrieve outstanding row errors when configuring sessions with <code>AUTO_FLUSH_BACKGROUND</code>.</p>
+</li>
+<li>
+<p>New server-level metrics allow you to monitor CPU usage and context switching.</p>
+</li>
+<li>
+<p>Kudu now builds on RHEL 7, CentOS 7, and SLES 12. Extra instructions are included
+for SLES 12.</p>
+</li>
+</ol>
+</div>
+</div>
+<div class="sect3">
+<h4 id="rn_0.7.0_fixed_issues"><a class="link" href="#rn_0.7.0_fixed_issues">Fixed Issues</a></h4>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p><a href="https://issues.cloudera.org/browse/KUDU-1288">KUDU-1288</a> fixes a severe file descriptor
+leak, which could previously only be resolved by restarting the tablet server.</p>
+</li>
+<li>
+<p><a href="https://issues.cloudera.org/browse/KUDU-1250">KUDU-1250</a> fixes a hang in the Java
+client when processing an in-flight batch and the previous batch encountered an error.</p>
+</li>
+</ol>
+</div>
+</div>
+<div class="sect3">
+<h4 id="rn_0.7.0_changes"><a class="link" href="#rn_0.7.0_changes">Other noteworthy changes</a></h4>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p>The file block manager&#8217;s performance was improved, but it is still not recommended for
+real-world use.</p>
+</li>
+<li>
+<p>The master now attempts to spread tablets more evenly across the cluster during
+table creation. This has no impact on existing tables, but will improve the speed
+at which under-replicated tabletsare re-replicated after a tablet server failure.</p>
+</li>
+<li>
+<p>All licensing documents have been modified to adhere to ASF guidelines.</p>
+</li>
+<li>
+<p>Kudu now requires an out-of-tree build directory. Review the build instructions
+for additional information.</p>
+</li>
+<li>
+<p>The <code>C` client library is now explicitly built against the
+link:https://gcc.gnu.org/onlinedocs/libstdc/manual/using_dual_abi.html[old gcc5 ABI].
+If you use gcc5 to build a Kudu application, your application must use the old ABI
+as well. This is typically achieved by defining the `_GLIBCXX_USE_CXX11_ABI</code> macro
+at compile-time when building your application. For more information, see the
+previous link and link:http://developerblog.redhat.com/2015/02/05/gcc5-and-the-c11-abi/.</p>
+</li>
+<li>
+<p>The Python client is no longer considered experimental.</p>
+</li>
+</ol>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_limitations"><a class="link" href="#_limitations">Limitations</a></h4>
+<div class="paragraph">
+<p>See also <a href="#beta_limitations">Limitations of the Kudu Public Beta</a>. Where applicable, this list adds to or overrides that
+list.</p>
+</div>
+<div class="sect4">
+<h5 id="_operating_system_limitations"><a class="link" href="#_operating_system_limitations">Operating System Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Kudu 0.7 is known to work on RHEL 7 or 6.4 or newer, CentOS 7 or 6.4 or newer, Ubuntu
+Trusty, and SLES 12. Other operating systems may work but have not been tested.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="rn_0.6.0"><a class="link" href="#rn_0.6.0">Release notes specific to 0.6.0</a></h3>
+<div class="paragraph">
+<p>The 0.6.0 release contains incremental improvements and bug fixes. The most notable
+changes are:</p>
+</div>
+<div class="olist arabic">
+<ol class="arabic">
+<li>
+<p>The Java client&#8217;s CreateTableBuilder and AlterTableBuilder classes have been renamed
+to CreateTableOptions and AlterTableOptions. Their methods now also return <code>this</code> objects,
+allowing them to be used as builders.</p>
+</li>
+<li>
+<p>The Java client&#8217;s AbstractKuduScannerBuilder#maxNumBytes() setter is now called
+batchSizeBytes as is the corresponding property in AsyncKuduScanner. This makes it
+consistent with the C++ client.</p>
+</li>
+<li>
+<p>The "kudu-admin" tool can now list and delete tables via its new subcommands
+"list_tables" and "delete_table &lt;table_name&gt;".</p>
+</li>
+<li>
+<p>OSX is now supported for single-host development. Please consult its specific installation
+instructions in <a href="installation.html#osx_from_source">OS X</a>.</p>
+</li>
+</ol>
+</div>
+<div class="paragraph">
+<p>The upgrade instructions are situated at <a href="installation.html#upgrade">Upgrade from 0.5.0 to 0.6.0</a>.</p>
+</div>
+<div class="sect3">
+<h4 id="_limitations_2"><a class="link" href="#_limitations_2">Limitations</a></h4>
+<div class="paragraph">
+<p>See also <a href="#beta_limitations">Limitations of the Kudu Public Beta</a>. Where applicable, this list adds to or overrides that
+list.</p>
+</div>
+<div class="sect4">
+<h5 id="_operating_system_limitations_2"><a class="link" href="#_operating_system_limitations_2">Operating System Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Kudu 0.6 is known to work on RHEL 6.4 or newer, CentOS 6.4 or newer, and Ubuntu
+Trusty. Other operating systems may work but have not been tested.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_api_limitations"><a class="link" href="#_api_limitations">API Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>The Python client is still considered experimental.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="rn_0.5.0"><a class="link" href="#rn_0.5.0">Release Notes Specific to 0.5.0</a></h3>
+<div class="sect3">
+<h4 id="_limitations_3"><a class="link" href="#_limitations_3">Limitations</a></h4>
+<div class="paragraph">
+<p>See also <a href="#beta_limitations">Limitations of the Kudu Public Beta</a>. Where applicable, this list adds to or overrides that
+list.</p>
+</div>
+<div class="sect4">
+<h5 id="_operating_system_limitations_3"><a class="link" href="#_operating_system_limitations_3">Operating System Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Kudu 0.5 is known to work on RHEL 7 or 6.4 or newer, CentOS 7 or 6.4 or newer, Ubuntu
+Trusty, and SLES 12. Other operating systems may work but have not been tested.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_api_limitations_2"><a class="link" href="#_api_limitations_2">API Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>The Python client is considered experimental.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_about_the_kudu_public_beta"><a class="link" href="#_about_the_kudu_public_beta">About the Kudu Public Beta</a></h3>
+<div class="paragraph">
+<p>This release of Kudu is a public beta. Do not run this beta release on production clusters.
+During the public beta period, Kudu will be supported via a
+<a href="https://issues.cloudera.org/projects/KUDU">public JIRA</a> and a public
+<a href="http://mail-archives.apache.org/mod_mbox/incubator-kudu-user/">mailing list</a>, which will be
+monitored by the Kudu development team and community members. Commercial support
+is not available at this time.</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>You can submit any issues or feedback related to your Kudu experience via either
+the JIRA system or the mailing list. The Kudu development team and community members
+will respond and assist as quickly as possible.</p>
+</li>
+<li>
+<p>The Kudu team will work with early adopters to fix bugs and release new binary drops
+when fixes or features are ready. However, we cannot commit to issue resolution or
+bug fix delivery times during the public beta period, and it is possible that some
+fixes or enhancements will not be selected for a release.</p>
+</li>
+<li>
+<p>We can&#8217;t guarantee time frames or contents for future beta code drops. However,
+they will be announced to the user group when they occur.</p>
+</li>
+<li>
+<p>No guarantees are made regarding upgrades from this release to follow-on releases.
+While multiple drops of beta code are planned, we can&#8217;t guarantee their schedules
+or contents.</p>
+</li>
+</ul>
+</div>
+<div class="sect3">
+<h4 id="_kudu_impala_integration_features"><a class="link" href="#_kudu_impala_integration_features">Kudu-Impala Integration Features</a></h4>
+<div class="dlist">
+<dl>
+<dt class="hdlist1"><code>CREATE TABLE</code></dt>
+<dd>
+<p>Impala supports creating and dropping tables using Kudu as the persistence layer.
+The tables follow the same internal / external approach as other tables in Impala,
+allowing for flexible data ingestion and querying.</p>
+</dd>
+<dt class="hdlist1"><code>INSERT</code></dt>
+<dd>
+<p>Data can be inserted into Kudu tables in Impala using the same mechanisms as
+any other table with HDFS or HBase persistence.</p>
+</dd>
+<dt class="hdlist1"><code>UPDATE</code> / <code>DELETE</code></dt>
+<dd>
+<p>Impala supports the <code>UPDATE</code> and <code>DELETE</code> SQL commands to modify existing data in
+a Kudu table row-by-row or as a batch. The syntax of the SQL commands is chosen
+to be as compatible as possible to existing solutions. In addition to simple <code>DELETE</code>
+or <code>UPDATE</code> commands, you can specify complex joins in the <code>FROM</code> clause of the query
+using the same syntax as a regular <code>SELECT</code> statement.</p>
+</dd>
+<dt class="hdlist1">Flexible Partitioning</dt>
+<dd>
+<p>Similar to partitioning of tables in Hive, Kudu allows you to dynamically
+pre-split tables by hash or range into a predefined number of tablets, in order
+to distribute writes and queries evenly across your cluster. You can partition by
+any number of primary key columns, by any number of hashes and an optional list of
+split rows. See <a href="schema_design.html">Schema Design</a>.</p>
+</dd>
+<dt class="hdlist1">Parallel Scan</dt>
+<dd>
+<p>To achieve the highest possible performance on modern hardware, the Kudu client
+within Impala parallelizes scans to multiple tablets.</p>
+</dd>
+<dt class="hdlist1">High-efficiency queries</dt>
+<dd>
+<p>Where possible, Impala pushes down predicate evaluation to Kudu, so that predicates
+are evaluated as close as possible to the data. Query performance is comparable
+to Parquet in many workloads.</p>
+</dd>
+</dl>
+</div>
+</div>
+<div class="sect3">
+<h4 id="beta_limitations"><a class="link" href="#beta_limitations">Limitations of the Kudu Public Beta</a></h4>
+<div class="paragraph">
+<p>Items in this list may be amended or superseded by limitations listed in the release
+notes for specific Kudu releases above.</p>
+</div>
+<div class="sect4">
+<h5 id="_schema_limitations"><a class="link" href="#_schema_limitations">Schema Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Kudu is primarily designed for analytic use cases and, in the beta release,
+you are likely to encounter issues if a single row contains multiple kilobytes of data.</p>
+</li>
+<li>
+<p>The columns which make up the primary key must be listed first in the schema.</p>
+</li>
+<li>
+<p>Key columns cannot be altered. You must drop and recreate a table to change its keys.</p>
+</li>
+<li>
+<p>Key columns must not be null.</p>
+</li>
+<li>
+<p>Columns with <code>DOUBLE</code>, <code>FLOAT</code>, or <code>BOOL</code> types are not allowed as part of a
+primary key definition.</p>
+</li>
+<li>
+<p>Type and nullability of existing columns cannot be changed by altering the table.</p>
+</li>
+<li>
+<p>A table’s primary key cannot be changed.</p>
+</li>
+<li>
+<p>Dropping a column does not immediately reclaim space. Compaction must run first.
+There is no way to run compaction manually, but dropping the table will reclaim the
+space immediately.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_ingest_limitations"><a class="link" href="#_ingest_limitations">Ingest Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Ingest via Sqoop or Flume is not supported in the public beta. The recommended
+approach for bulk ingest is to use Impala’s <code>CREATE TABLE AS SELECT</code> functionality
+or use the Kudu Java or C++ API.</p>
+</li>
+<li>
+<p>Tables must be manually pre-split into tablets using simple or compound primary
+keys. Automatic splitting is not yet possible. See
+<a href="schema_design.html">Schema Design</a>.</p>
+</li>
+<li>
+<p>Tablets cannot currently be merged. Instead, create a new table with the contents
+of the old tables to be merged.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_replication_and_backup_limitations"><a class="link" href="#_replication_and_backup_limitations">Replication and Backup Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Replication and failover of Kudu masters is considered experimental. It is
+recommended to run a single master and periodically perform a manual backup of
+its data directories.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_impala_limitations"><a class="link" href="#_impala_limitations">Impala Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>To use Kudu with Impala, you must install a special release of Impala called
+Impala_Kudu. Obtaining and installing a compatible Impala release is detailed in Kudu&#8217;s
+<a href="kudu_impala_integration.html">Impala Integration</a> documentation.</p>
+</li>
+<li>
+<p>To use Impala_Kudu alongside an existing Impala instance, you must install using parcels.</p>
+</li>
+<li>
+<p>Updates, inserts, and deletes via Impala are non-transactional. If a query
+fails part of the way through, its partial effects will not be rolled back.</p>
+</li>
+<li>
+<p>All queries will be distributed across all Impala hosts which host a replica
+of the target table(s), even if a predicate on a primary key could correctly
+restrict the query to a single tablet. This limits the maximum concurrency of
+short queries made via Impala.</p>
+</li>
+<li>
+<p>No timestamp and decimal type support.</p>
+</li>
+<li>
+<p>The maximum parallelism of a single query is limited to the number of tablets
+in a table. For good analytic performance, aim for 10 or more tablets per host
+or use large tables.</p>
+</li>
+<li>
+<p>Impala is only able to push down predicates involving <code>=</code>, <code>&#8656;</code>, <code>&gt;=</code>,
+or <code>BETWEEN</code> comparisons between any column and a literal value, and <code>&lt;</code> and <code>&gt;</code>
+for integer columns only. For example, for a table with an integer key <code>ts</code>, and
+a string key <code>name</code>, the predicate <code>WHERE ts &gt;= 12345</code> will convert into an
+efficient range scan, whereas <code>where name &gt; 'lipcon'</code> will currently fetch all
+data from the table and evaluate the predicate within Impala.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_security_limitations"><a class="link" href="#_security_limitations">Security Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Authentication and authorization are not included in the public beta.</p>
+</li>
+<li>
+<p>Data encryption is not included in the public beta.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_client_and_api_limitations"><a class="link" href="#_client_and_api_limitations">Client and API Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>Potentially-incompatible C++, Java and Python API changes may be required during the
+public beta.</p>
+</li>
+<li>
+<p><code>ALTER TABLE</code> is not yet fully supported via the client APIs. More <code>ALTER TABLE</code>
+operations will become available in future betas.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_application_integration_limitations"><a class="link" href="#_application_integration_limitations">Application Integration Limitations</a></h5>
+<div class="ulist">
+<ul>
+<li>
+<p>The Spark DataFrame implementation is not yet complete.</p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect4">
+<h5 id="_other_known_issues"><a class="link" href="#_other_known_issues">Other Known Issues</a></h5>
+<div class="paragraph">
+<p>The following are known bugs and issues with the current beta release. They will
+be addressed in later beta releases.</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Building Kudu from source using <code>gcc</code> 4.6 or 4.7 causes runtime and test failures. Be sure
+you are using a different version of <code>gcc</code> if you build Kudu from source.</p>
+</li>
+<li>
+<p>If the Kudu master is configured with the <code>-log_fsync_all</code> option, tablet servers
+and clients will experience frequent timeouts, and the cluster may become unusable.</p>
+</li>
+<li>
+<p>If a tablet server has a very large number of tablets, it may take several minutes
+to start up. It is recommended to limit the number of tablets per server to 100 or fewer.
+Consider this limitation when pre-splitting your tables. If you notice slow start-up times,
+you can monitor the number of tablets per server in the web UI.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_disclaimer_on_apache_incubation"><a class="link" href="#_disclaimer_on_apache_incubation">Disclaimer on Apache Incubation</a></h3>
+<div class="paragraph">
+<p>Apache Kudu is an effort undergoing incubation at The Apache Software
+Foundation (ASF), sponsored by the Apache Incubator PMC. Incubation is
+required of all newly accepted projects until a further review
+indicates that the infrastructure, communications, and decision making
+process have stabilized in a manner consistent with other successful
+ASF projects. While incubation status is not necessarily a reflection
+of the completeness or stability of the code, it does indicate that
+the project has yet to be fully endorsed by the ASF.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_resources"><a class="link" href="#_resources">Resources</a></h3>
+<div class="ulist">
+<ul>
+<li>
+<p><a href="http://getkudu.io">Kudu Website</a></p>
+</li>
+<li>
+<p><a href="http://github.com/cloudera/kudu">Kudu Github Repository</a></p>
+</li>
+<li>
+<p><a href="index.html">Kudu Documentation</a></p>
+</li>
+</ul>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_installation_options"><a class="link" href="#_installation_options">Installation Options</a></h3>
+<div class="ulist">
+<ul>
+<li>
+<p>A Quickstart VM is provided to get you up and running quickly.</p>
+</li>
+<li>
+<p>You can install Kudu using provided deb/yum packages.</p>
+</li>
+<li>
+<p>You can install Kudu, in clusters managed by Cloudera Manager, using parcels or deb/yum packages.</p>
+</li>
+<li>
+<p>You can build Kudu from source.</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>For full installation details, see <a href="installation.html">Kudu Installation</a>.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="_next_steps"><a class="link" href="#_next_steps">Next Steps</a></h3>
+<div class="ulist">
+<ul>
+<li>
+<p><a href="quickstart.html">Kudu Quickstart</a></p>
+</li>
+<li>
+<p><a href="installation.html">Installing Kudu</a></p>
+</li>
+<li>
+<p><a href="configuration.html">Configuring Kudu</a></p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+</div>
+    </div>
+    <div class="col-md-3">
+
+  <div id="toc" data-spy="affix" data-offset-top="70">
+  <ul>
+
+      <li>
+
+          <a href="introduction.html">Introducing Kudu</a> 
+      </li> 
+      <li>
+<span class="active-toc">Kudu Release Notes</span>
+            <ul class="sectlevel1">
+<li><a href="#_introducing_kudu">Introducing Kudu</a>
+<ul class="sectlevel2">
+<li><a href="#rn_0.7.0">Release notes specific to 0.7.0</a>
+<ul class="sectlevel3">
+<li><a href="#rn_0.7.0_incompatible_changes">Incompatible changes</a></li>
+<li><a href="#rn_0.7.0_new_features">New features</a></li>
+<li><a href="#rn_0.7.0_improvements">Improvements</a></li>
+<li><a href="#rn_0.7.0_fixed_issues">Fixed Issues</a></li>
+<li><a href="#rn_0.7.0_changes">Other noteworthy changes</a></li>
+<li><a href="#_limitations">Limitations</a></li>
+</ul>
+</li>
+<li><a href="#rn_0.6.0">Release notes specific to 0.6.0</a>
+<ul class="sectlevel3">
+<li><a href="#_limitations_2">Limitations</a></li>
+</ul>
+</li>
+<li><a href="#rn_0.5.0">Release Notes Specific to 0.5.0</a>
+<ul class="sectlevel3">
+<li><a href="#_limitations_3">Limitations</a></li>
+</ul>
+</li>
+<li><a href="#_about_the_kudu_public_beta">About the Kudu Public Beta</a>
+<ul class="sectlevel3">
+<li><a href="#_kudu_impala_integration_features">Kudu-Impala Integration Features</a></li>
+<li><a href="#beta_limitations">Limitations of the Kudu Public Beta</a></li>
+</ul>
+</li>
+<li><a href="#_disclaimer_on_apache_incubation">Disclaimer on Apache Incubation</a></li>
+<li><a href="#_resources">Resources</a></li>
+<li><a href="#_installation_options">Installation Options</a></li>
+<li><a href="#_next_steps">Next Steps</a></li>
+</ul>
+</li>
+</ul> 
+      </li> 
+      <li>
+
+          <a href="quickstart.html">Getting Started with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="installation.html">Installation Guide</a> 
+      </li> 
+      <li>
+
+          <a href="configuration.html">Configuring Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="kudu_impala_integration.html">Using Impala with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="administration.html">Administering Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="troubleshooting.html">Troubleshooting Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="developing.html">Developing Applications with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="schema_design.html">Kudu Schema Design</a> 
+      </li> 
+      <li>
+
+          <a href="transaction_semantics.html">Kudu Transaction Semantics</a> 
+      </li> 
+      <li>
+
+          <a href="contributing.html">Contributing to Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="style_guide.html">Kudu Documentation Style Guide</a> 
+      </li> 
+      <li>
+
+          <a href="configuration_reference.html">Kudu Configuration Reference</a> 
+      </li> 
+  </ul>
+  </div>
+    </div>
+  </div>
+</div>
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+---
+title: Apache Kudu (incubating) Schema Design
+layout: default
+active_nav: docs
+last_updated: 'Last updated 2016-01-23 04:11:21 SAST'
+---
+<!--
+
+Licensed 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.
+-->
+
+
+<div class="container">
+  <div class="row">
+    <div class="col-md-9">
+
+<h1>Apache Kudu (incubating) Schema Design</h1>
+      <div id="preamble">
+<div class="sectionbody">
+<div class="paragraph">
+<p>Kudu tables have a structured data model similar to tables in a traditional
+RDBMS. Schema design is critical for achieving the best performance and operational
+stability from Kudu. Every workload is unique, and there is no single schema design
+that is best for every table. This document outlines effective schema design
+philosophies for Kudu, paying particular attention to where they differ from
+approaches used for traditional RDBMS schemas.</p>
+</div>
+<div class="paragraph">
+<p>At a high level, there are three concerns in Kudu schema design:
+<a href="#column-design">column design</a>, <a href="#primary-keys">primary keys</a>, and
+<a href="#data-distribution">data distribution</a>. Of these, only data distribution will
+be a new concept for those familiar with traditional relational databases. The
+next sections discuss <a href="#alter-schema">altering the schema</a> of an existing table,
+and <a href="#known-limitations">known limitations</a> with regard to schema design.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="column-design"><a class="link" href="#column-design">Column Design</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>A Kudu Table consists of one or more columns, each with a predefined type.
+Columns that are not part of the primary key may optionally be nullable.
+Supported column types include:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>boolean</p>
+</li>
+<li>
+<p>8 bit signed integer</p>
+</li>
+<li>
+<p>16 bit signed integer</p>
+</li>
+<li>
+<p>32 bit signed integer</p>
+</li>
+<li>
+<p>64 bit signed integer</p>
+</li>
+<li>
+<p>timestamp</p>
+</li>
+<li>
+<p>single-precision (32 bit) IEEE-754 floating-point number</p>
+</li>
+<li>
+<p>double-precision (64 bit) IEEE-754 floating-point number</p>
+</li>
+<li>
+<p>UTF-8 encoded string</p>
+</li>
+<li>
+<p>binary</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>Kudu takes advantage of strongly-typed columns and a columnar on-disk storage
+format to provide efficient encoding and serialization. To make the most of these
+features, columns must be specified as the appropriate type, rather than
+simulating a 'schemaless' table using string or binary columns for data which
+may otherwise be structured. In addition to encoding, Kudu optionally allows
+compression to be specified on a per-column basis.</p>
+</div>
+<div class="sect2">
+<h3 id="encoding"><a class="link" href="#encoding">Column Encoding</a></h3>
+<div class="paragraph">
+<p>Each column in a Kudu table can be created with an encoding, based on the type
+of the column. Columns use plain encoding by default.</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<caption class="title">Table 1. Encoding Types</caption>
+<colgroup>
+<col style="width: 50%;">
+<col style="width: 50%;">
+</colgroup>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Column Type</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Encoding</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">integer, timestamp</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">plain, bitshuffle, run length</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">float</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">plain, bitshuffle</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">bool</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">plain, dictionary, run length</p></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string, binary</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">plain, prefix, dictionary</p></td>
+</tr>
+</tbody>
+</table>
+<div id="plain" class="dlist">
+<dl>
+<dt class="hdlist1">Plain Encoding</dt>
+<dd>
+<p>Data is stored in its natural format. For example, <code>int32</code> values
+are stored as fixed-size 32-bit little-endian integers.</p>
+</dd>
+</dl>
+</div>
+<div id="bitshuffle" class="dlist">
+<dl>
+<dt class="hdlist1">Bitshuffle Encoding</dt>
+<dd>
+<p>Data is rearranged to store the most significant bit of
+every value, followed by the second most significant bit of every value, and so
+on. Finally, the result is LZ4 compressed. Bitshuffle encoding is a good choice for
+columns that have many repeated values, or values that change by small amounts
+when sorted by primary key. The
+<a href="https://github.com/kiyo-masui/bitshuffle">bitshuffle</a> project has a good
+overview of performance and use cases.</p>
+</dd>
+</dl>
+</div>
+<div id="run-length" class="dlist">
+<dl>
+<dt class="hdlist1">Run Length Encoding</dt>
+<dd>
+<p><em>Runs</em> (consecutive repeated values), are compressed in a
+column by storing only the value and the count. Run length encoding is effective
+for columns with many consecutive repeated values when sorted by primary key.</p>
+</dd>
+</dl>
+</div>
+<div id="dictionary" class="dlist">
+<dl>
+<dt class="hdlist1">Dictionary Encoding</dt>
+<dd>
+<p>A dictionary of unique values is built, and each column value
+is encoded as its corresponding index in the dictionary. Dictionary encoding
+is effective for columns with low cardinality. If the column values of a given row set
+are unable to be compressed because the number of unique values is too high, Kudu will
+transparently fall back to plain encoding for that row set. This is evaluated during
+flush.</p>
+</dd>
+</dl>
+</div>
+<div id="prefix" class="dlist">
+<dl>
+<dt class="hdlist1">Prefix Encoding</dt>
+<dd>
+<p>Common prefixes are compressed in consecutive column values. Prefix
+encoding can be effective for values that share common prefixes, or the first
+column of the primary key, since rows are sorted by primary key within tablets.</p>
+</dd>
+</dl>
+</div>
+</div>
+<div class="sect2">
+<h3 id="compression"><a class="link" href="#compression">Column Compression</a></h3>
+<div class="paragraph">
+<p>Kudu allows per-column compression using LZ4, <code>snappy</code>, or <code>zlib</code> compression
+codecs. By default, columns are stored uncompressed. Consider using compression
+if reducing storage space is more important than raw scan performance.</p>
+</div>
+<div class="paragraph">
+<p>+
+Every data set will compress differently, but in general LZ4 has the least effect on
+performance, while <code>zlib</code> will compress to the smallest data sizes.
+Bitshuffle-encoded columns are inherently compressed using LZ4, so it is not
+typically beneficial to apply additional compression on top of this encoding.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="primary-keys"><a class="link" href="#primary-keys">Primary Keys</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Each Kudu table must declare a primary key comprised of one or more columns.
+Primary key columns must be non-nullable, and may not be a boolean or
+floating-point type. Every row in a table must have a unique set of values for
+its primary key columns. As with a traditional RDBMS, primary key
+selection is critical to ensuring performant database operations.</p>
+</div>
+<div class="paragraph">
+<p>Unlike an RDBMS, Kudu does not provide an auto-incrementing column feature, so
+the application must always provide the full primary key during insert or
+ingestion. In addition, Kudu does not allow the primary key values of a row to
+be updated.</p>
+</div>
+<div class="paragraph">
+<p>Within a tablet, rows are stored sorted lexicographically by primary key. Advanced
+schema designs can take advantage of this ordering to achieve good distribution of
+data among tablets, while retaining consistent ordering in intra-tablet scans. See
+<a href="#data-distribution">Data Distribution</a> for more information.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="data-distribution"><a class="link" href="#data-distribution">Data Distribution</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Kudu tables, unlike traditional relational tables, are partitioned into tablets
+and distributed across many tablet servers. A row always belongs to a single
+tablet (and its replicas). The method of assigning rows to tablets is specified
+in a configurable <em>partition schema</em> for each table, during table creation.</p>
+</div>
+<div class="paragraph">
+<p>Choosing a data distribution strategy requires you to understand the data model and
+expected workload of a table. For write-heavy workloads, it is important to
+design the distribution such that writes are spread across tablets in order to
+avoid overloading a single tablet. For workloads involving many short scans, performance
+can be improved if all of the data for the scan is located in the same
+tablet. Understanding these fundamental trade-offs is central to designing an effective
+partition schema.</p>
+</div>
+<div class="paragraph">
+<p>Kudu provides two types of partition schema: <a href="#range-partitioning">range partitioning</a> and
+<a href="#hash-bucketing">hash bucketing</a>. These schema types can be <a href="#hash-and-range">used
+together</a> or independently. Kudu does not yet allow tablets to be split after
+creation, so you must design your partition schema ahead of time to ensure that
+a sufficient number of tablets are created.</p>
+</div>
+<div class="sect2">
+<h3 id="range-partitioning"><a class="link" href="#range-partitioning">Range Partitioning</a></h3>
+<div class="paragraph">
+<p>With range partitioning, rows are distributed into tablets using a totally-ordered
+distribution key. Each tablet is assigned a contiguous segment of the table&#8217;s
+distribution keyspace. By default, the distribution key uses all of the columns of the
+primary key, but it may be configured to use any subset of the primary key
+columns.</p>
+</div>
+<div class="paragraph">
+<p>During table creation, tablet boundaries are specified as a sequence of <em>split
+rows</em>. Consider the following table schema (using SQL syntax for clarity):</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-sql" data-lang="sql">CREATE TABLE customers (
+  first_name STRING NOT NULL,
+  last_name STRING NOT NULL,
+  order_count INT32,
+  PRIMARY KEY (last_name, first_name),
+)</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Specifying the split rows as <code>(("b", ""), ("c", ""), ("d", ""), .., ("z", ""))</code>
+(25 split rows total) will result in the creation of 26 tablets, with each
+tablet containing a range of customer surnames all beginning with a given letter.
+This is an effective partition schema for a workload where customers are inserted
+and updated uniformly by last name, and scans are typically performed over a range
+of surnames.</p>
+</div>
+<div class="paragraph">
+<p>It may make sense to partition a table by range using only a subset of the
+primary key columns, or with a different ordering than the primary key. For
+instance, you can change the above example to specify that the range partition
+should only include the <code>last_name</code> column. In that case, Kudu would guarantee that all
+customers with the same last name would fall into the same tablet, regardless of
+the provided split rows.</p>
+</div>
+</div>
+<div class="sect2">
+<h3 id="hash-bucketing"><a class="link" href="#hash-bucketing">Hash Bucketing</a></h3>
+<div class="paragraph">
+<p>Hash bucketing distributes rows by hash value into one of many buckets. Each
+tablet is responsible for the rows falling into a single bucket. The number of
+buckets (and therefore tablets), is specified during table creation. Typically,
+all of the primary key columns are used as the columns to hash, but as with range
+partitioning, any subset of the primary key columns can be used.</p>
+</div>
+<div class="paragraph">
+<p>Hash partitioning is an effective strategy to increase the amount of parallelism
+for workloads that would otherwise skew writes into a small number of tablets.
+Consider the following table schema.</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-sql" data-lang="sql">CREATE TABLE metrics (
+  host STRING NOT NULL,
+  metric STRING,
+  time TIMESTAMP NOT NULL,
+  measurement DOUBLE,
+  PRIMARY KEY (time, metric, host),
+)</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>If you use the default range partitioning over the primary key columns, inserts will
+tend to only go to the tablet covering the current time, which limits the
+maximum write throughput to the throughput of a single tablet. If you use hash
+partitioning, you can guarantee a number of parallel writes equal to the number
+of buckets specified when defining the partition schema. The trade-off is that a
+scan over a single time range now must touch each of these tablets, instead of
+(possibly) a single tablet. Hash bucketing can be an effective tool for mitigating
+other types of write skew as well, such as monotonically increasing values.</p>
+</div>
+<div class="paragraph">
+<p>As an advanced optimization, you can create a table with more than one
+hash bucket component, as long as the column sets included in each are disjoint,
+and all hashed columns are part of the primary key. The total number of tablets
+created will be the product of the hash bucket counts. For example, the above
+<code>metrics</code> table could be created with two hash bucket components, one over the
+<code>time</code> column with 4 buckets, and one over the <code>metric</code> and <code>host</code> columns with
+8 buckets. The total number of tablets will be 32. The advantage of using two
+separate hash bucket components is that scans which specify equality constraints
+on the <code>metric</code> and <code>host</code> columns will be able to skip 7/8 of the total
+tablets, leaving a total of just 4 tablets to scan.</p>
+</div>
+<div class="admonitionblock warning">
+<table>
+<tr>
+<td class="icon">
+<i class="fa icon-warning" title="Warning"></i>
+</td>
+<td class="content">
+This optimization is not yet implemented. See
+<a href="#known-limitations">known limitations</a> for details.
+</td>
+</tr>
+</table>
+</div>
+</div>
+<div class="sect2">
+<h3 id="hash-and-range"><a class="link" href="#hash-and-range">Hash Bucketing and Range Partitioning</a></h3>
+<div class="paragraph">
+<p>Hash bucketing can be combined with range partitioning. Adding hash bucketing to
+a range partitioned table has the effect of parallelizing operations that would
+otherwise operate sequentially over the range. The total number of tablets is
+the product of the number of hash buckets and the number of split rows plus one.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="alter-schema"><a class="link" href="#alter-schema">Schema Alterations</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>You can alter a table&#8217;s schema in the following ways:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Rename the table</p>
+</li>
+<li>
+<p>Rename, add, or drop columns</p>
+</li>
+<li>
+<p>Rename (but not drop) primary key columns</p>
+</li>
+</ul>
+</div>
+<div class="paragraph">
+<p>You cannot modify the partition schema after table creation.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="known-limitations"><a class="link" href="#known-limitations">Known Limitations</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Kudu currently has some known limitations that may factor into schema design:</p>
+</div>
+<div class="dlist">
+<dl>
+<dt class="hdlist1">Immutable Primary Keys</dt>
+<dd>
+<p>Kudu does not allow you to update the primary key of a
+row after insertion.</p>
+</dd>
+<dt class="hdlist1">Non-alterable Primary Key</dt>
+<dd>
+<p>Kudu does not allow you to alter the primary key
+columns after table creation.</p>
+</dd>
+<dt class="hdlist1">Non-alterable Partition Schema</dt>
+<dd>
+<p>Kudu does not allow you to alter the
+partition schema after table creation.</p>
+</dd>
+<dt class="hdlist1">Partition Pruning</dt>
+<dd>
+<p>When tables use hash buckets, the Java and C++ clients do
+not yet use scan predicates to prune tablets for scans over these tables. In the
+future, specifying an equality predicate on all columns in the hash bucket
+component will limit the scan to only the tablets corresponding to the hash
+bucket.</p>
+</dd>
+<dt class="hdlist1">Tablet Splitting</dt>
+<dd>
+<p>You currently cannot split or merge tablets after table
+creation. You must create the appropriate number of tablets in the
+partition schema at table creation. As a workaround, you can copy the contents
+of one table to another by using a <code>CREATE TABLE AS SELECT</code> statement or creating
+an empty table and using an <code>INSERT</code> query with <code>SELECT</code> in the predicate to
+populate the new table.</p>
+</dd>
+</dl>
+</div>
+</div>
+</div>
+    </div>
+    <div class="col-md-3">
+
+  <div id="toc" data-spy="affix" data-offset-top="70">
+  <ul>
+
+      <li>
+
+          <a href="introduction.html">Introducing Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="release_notes.html">Kudu Release Notes</a> 
+      </li> 
+      <li>
+
+          <a href="quickstart.html">Getting Started with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="installation.html">Installation Guide</a> 
+      </li> 
+      <li>
+
+          <a href="configuration.html">Configuring Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="kudu_impala_integration.html">Using Impala with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="administration.html">Administering Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="troubleshooting.html">Troubleshooting Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="developing.html">Developing Applications with Kudu</a> 
+      </li> 
+      <li>
+<span class="active-toc">Kudu Schema Design</span>
+            <ul class="sectlevel1">
+<li><a href="#column-design">Column Design</a>
+<ul class="sectlevel2">
+<li><a href="#encoding">Column Encoding</a></li>
+<li><a href="#compression">Column Compression</a></li>
+</ul>
+</li>
+<li><a href="#primary-keys">Primary Keys</a></li>
+<li><a href="#data-distribution">Data Distribution</a>
+<ul class="sectlevel2">
+<li><a href="#range-partitioning">Range Partitioning</a></li>
+<li><a href="#hash-bucketing">Hash Bucketing</a></li>
+<li><a href="#hash-and-range">Hash Bucketing and Range Partitioning</a></li>
+</ul>
+</li>
+<li><a href="#alter-schema">Schema Alterations</a></li>
+<li><a href="#known-limitations">Known Limitations</a></li>
+</ul> 
+      </li> 
+      <li>
+
+          <a href="transaction_semantics.html">Kudu Transaction Semantics</a> 
+      </li> 
+      <li>
+
+          <a href="contributing.html">Contributing to Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="style_guide.html">Kudu Documentation Style Guide</a> 
+      </li> 
+      <li>
+
+          <a href="configuration_reference.html">Kudu Configuration Reference</a> 
+      </li> 
+  </ul>
+  </div>
+    </div>
+  </div>
+</div>
\ No newline at end of file

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+---
+title: Apache Kudu (incubating) Documentation Style Guide
+layout: default
+active_nav: docs
+last_updated: 'Last updated 2016-01-23 04:11:21 SAST'
+---
+<!--
+
+Licensed 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.
+-->
+
+
+<div class="container">
+  <div class="row">
+    <div class="col-md-9">
+
+<h1>Apache Kudu (incubating) Documentation Style Guide</h1>
+      <div id="preamble">
+<div class="sectionbody">
+<div class="paragraph">
+<p>This document gives you the information you need to get started contributing to Kudu
+documentation. For code contribution guidelines, see
+<a href="contributing.html">Contributing to Kudu</a>.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_asciidoc"><a class="link" href="#_asciidoc">Asciidoc</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Kudu documentation is written in <a href="https://en.wikipedia.org/wiki/AsciiDoc">Asciidoc</a>
+and compiled into HTML and output using the <a href="http://asciidoctor.org/">Asciidoctor</a>
+toolchain. This provides several advantages. Among them:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>Asciidoc is a superset of Markdown, so if you already know Markdown you can get
+started right away.</p>
+</li>
+<li>
+<p>Github includes support for Asciidoc in its Atom editor, as well as real-time
+simplified HTML rendering.</p>
+</li>
+<li>
+<p>Patch submissions are small and easy to review.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_code_standards"><a class="link" href="#_code_standards">Code Standards</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Within reason, try to adhere to these standards:</p>
+</div>
+<div class="ulist">
+<ul>
+<li>
+<p>100 or fewer columns per line</p>
+</li>
+<li>
+<p>2 spaces rather than tabs for indentation</p>
+</li>
+<li>
+<p>No more than 4 nested levels in the documentation if possible: <code>(Document &#8594; Chapter
+&#8594; Section &#8594; Subsection)</code></p>
+</li>
+<li>
+<p>When possible, provide the language that a code listing is in, using the
+<code>[source,&lt;language&gt;]</code> macro. for example, <code>[source,sql]</code></p>
+</li>
+<li>
+<p>In general, do not indent Asciidoc, as indentation is significant. Code listings
+are one exception.</p>
+</li>
+</ul>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_building_documentation"><a class="link" href="#_building_documentation">Building Documentation</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>To build the documentation locally, you need the Asciidoctor Ruby application. To build the
+entire Kudu documentation set, change to the <code>docs/</code> directory and run:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="highlight"><code class="language-bash" data-lang="bash">asciidoctor -d book -D docs *.adoc</code></pre>
+</div>
+</div>
+<div class="paragraph">
+<p>This builds the HTML output in a new <em>docs/</em> directory within the current directory.
+Some content, such as the per-daemon configuration reference files, is not populated
+during a local build.</p>
+</div>
+<div class="paragraph">
+<p>To view the HTML, open <em>docs/index.html</em> in your local browser.</p>
+</div>
+<div class="paragraph">
+<p>You can also build only a single chapter. such as <em>introduction.adoc</em>, by passing its name instead.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_asciidoc_style_guide"><a class="link" href="#_asciidoc_style_guide">Asciidoc Style Guide</a></h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>Asciidoc supports a lot of syntax that we do not need to use. When possible, stick
+with the following, adapted from the
+<a href="https://hbase.apache.org/book.html#_hbase_reference_guide_style_guide_and_cheat_sheet">HBase Reference Guide</a>:</p>
+</div>
+<table class="tableblock frame-all grid-all spread">
+<caption class="title">Table 1. AsciiDoc Cheat Sheet</caption>
+<colgroup>
+<col style="width: 33%;">
+<col style="width: 33%;">
+<col style="width: 33%;">
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Element Type</th>
+<th class="tableblock halign-left valign-top">Desired Rendering</th>
+<th class="tableblock halign-left valign-top">How to do it</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A paragraph</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">a paragraph</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>Just type some text with a blank line at the top and bottom.</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Add line breaks within a paragraph without adding blank lines</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Manual line breaks</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>This will break + at the plus sign. Or prefix the whole paragraph with a line containing '[%hardbreaks]'</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Give a title to anything</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Colored italic bold differently-sized text</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+</div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">In-Line Code or commands</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">monospace</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>`text`</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">In-line literal content (things to be typed exactly as shown)</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">bold mono</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>*`typethis`*</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">In-line replaceable content (things to substitute with your own values)</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">bold italic mono</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>*_typesomething_*</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Code blocks with highlighting</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">monospace, highlighted, preserve space</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="literalblock">
+<div class="content">
+<pre>[source,java]
+----
+  myAwesomeCode() {
+}
+----</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Code block included from a separate file</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">included just as though it were part of the main file</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="literalblock">
+<div class="content">
+<pre>[source,ruby]
+----
+include::path/to/app.rb[]
+----</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Include only part of a separate file</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Similar to Javadoc</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>See <a href="http://asciidoctor.org/docs/user-manual/#by-tagged-regions" class="bare">http://asciidoctor.org/docs/user-manual/#by-tagged-regions</a></p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">File names, directory names, new terms</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">italic</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>_hbase-default.xml_</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">External naked URLs</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A link with the URL as link text</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>http://www.google.com</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">External URLs with text</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A link with arbitrary link text</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>link:http://www.google.com[Google]</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Create an internal anchor to cross-reference</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">not rendered</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>[[anchor_name]]</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Cross-reference an existing anchor using its default title</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">an internal hyperlink using the element title if available, otherwise using the anchor name</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>&lt;&lt;anchor_name&gt;&gt;</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Cross-reference an existing anchor using custom text</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">an internal hyperlink using arbitrary text</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>&lt;&lt;anchor_name,Anchor Text&gt;&gt;</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A block image</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">The image with alt text</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>image::sunset.jpg[Alt Text]</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>(put the image in the src/main/site/resources/images directory)</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">An inline image</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">The image with alt text, as part of the text flow</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>image:sunset.jpg [Alt Text]</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>(only one colon)</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Link to a remote image</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">show an image hosted elsewhere</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>image::http://inkscape.org/doc/examples/tux.svg[Tux,250,350]</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>(or <code>image:</code>)</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Add dimensions or a URL to the image</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">depends</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>inside the brackets after the alt text, specify width, height and/or link="http://my_link.com"</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A footnote</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">subscript link which takes you to the footnote</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>Some text.footnote:[The footnote text.]</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A note or warning with no title</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">The admonition image followed by the admonition</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>NOTE: My note here</pre>
+</div>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>WARNING: My warning here</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A complex note</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">The note has a title and/or multiple paragraphs and/or code blocks or lists, etc</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="literalblock">
+<div class="content">
+<pre>.The Title
+[NOTE]
+====
+Here is the note text.
+Everything until the second set of four equals signs
+is part of the note.
+----
+some source code
+----
+====</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Bullet lists</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">bullet lists</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>* list item 1</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>(see <a href="http://asciidoctor.org/docs/user-manual/#unordered-lists" class="bare">http://asciidoctor.org/docs/user-manual/#unordered-lists</a>)</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Numbered lists</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">numbered list</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>. list item 2</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>(see <a href="http://asciidoctor.org/docs/user-manual/#ordered-lists" class="bare">http://asciidoctor.org/docs/user-manual/#ordered-lists</a>)</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Checklists</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Checked or unchecked boxes</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>Checked:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>- [*]</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>Unchecked:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>- [ ]</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Multiple levels of lists</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">bulleted or numbered or combo</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>. Numbered (1), at top level
+* Bullet (2), nested under 1
+* Bullet (3), nested under 1
+. Numbered (4), at top level
+* Bullet (5), nested under 4
+** Bullet (6), nested under 5
+- [x] Checked (7), at top level</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Labelled lists / variablelists</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">a list item title or summary followed by content</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>Title:: content
+
+Title::
+  content</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">GUI menu cascades</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">bold text with arrows to show levels</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>Use an ASCII arrow.</p>
+</div>
+<div class="literalblock">
+<div class="content">
+<pre>*File -&gt; Print*</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>renders like <strong>File &#8594; Print</strong></p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Sidebars, quotes, or other blocks of text</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">a block of text, formatted differently from the default</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>Delimited using different delimiters, see <a href="http://asciidoctor.org/docs/user-manual/#built-in-blocks-summary" class="bare">http://asciidoctor.org/docs/user-manual/#built-in-blocks-summary</a>. Some of the examples above use delimiters like ...., ----,====.</p>
+</div>
+<div class="literalblock">
+<div class="content">
+<pre>[example]
+====
+This is an example block.
+====
+
+[source]
+----
+This is a source block.
+----
+
+[note]
+====
+This is a note block.
+====
+
+[quote]
+____
+This is a quote block.
+____</pre>
+</div>
+</div>
+<div class="paragraph">
+<p><strong>If you want to insert literal Asciidoc content that keeps being interpreted, when in doubt, use eight dots as the delimiter at the top and bottom.</strong></p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Nested Sections</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">chapter, section, sub-section, etc</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>= Book (or chapter if the chapter can be built alone, see leveloffset below)
+
+== Chapter (or section if the chapter is standalone)
+
+=== Section (or subsection, etc)
+
+==== Subsection</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>and so on up to 6 levels (think carefully about going deeper than 4 levels, maybe you can just titled paragraphs or lists instead). Note that you can include a book inside another book by adding the <code>:leveloffset:+1</code> macro directive directly before your include, and resetting it to 0 directly after. See the <em>book.adoc</em> source for examples, as this is how this guide handles chapters. <strong>Don&#8217;t do it for prefaces, glossaries, appendixes, or other special types of chapters.</strong></p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Include one file from another</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Content is included as though it were inline</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>include::[/path/to/file.adoc]</pre>
+</div>
+</div>
+<div class="paragraph">
+<p>For plenty of examples. see <em>docs/docs.adoc</em>.</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A table</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">a table</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p>See <a href="http://asciidoctor.org/docs/user-manual/#tables" class="bare">http://asciidoctor.org/docs/user-manual/#tables</a>. Generally rows are separated by newlines and columns by pipes</p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Comment out a single line</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A  line is skipped during rendering</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="paragraph">
+<p><code>// This line won&#8217;t show up</code></p>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Comment out a block</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">A section of the file is skipped during rendering</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>////
+Nothing between the slashes will show up.
+////</pre>
+</div>
+</div></div></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">Highlight text for review</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">text shows up with yellow background</p></td>
+<td class="tableblock halign-left valign-top"><div><div id="toc" class="toc">
+<div id="toctitle">Table of Contents</div>
+
+</div>
+<div class="listingblock">
+<div class="content">
+<pre>Test between #hash marks# is highlighted yellow.</pre>
+</div>
+</div></div></td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+    </div>
+    <div class="col-md-3">
+
+  <div id="toc" data-spy="affix" data-offset-top="70">
+  <ul>
+
+      <li>
+
+          <a href="introduction.html">Introducing Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="release_notes.html">Kudu Release Notes</a> 
+      </li> 
+      <li>
+
+          <a href="quickstart.html">Getting Started with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="installation.html">Installation Guide</a> 
+      </li> 
+      <li>
+
+          <a href="configuration.html">Configuring Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="kudu_impala_integration.html">Using Impala with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="administration.html">Administering Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="troubleshooting.html">Troubleshooting Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="developing.html">Developing Applications with Kudu</a> 
+      </li> 
+      <li>
+
+          <a href="schema_design.html">Kudu Schema Design</a> 
+      </li> 
+      <li>
+
+          <a href="transaction_semantics.html">Kudu Transaction Semantics</a> 
+      </li> 
+      <li>
+
+          <a href="contributing.html">Contributing to Kudu</a> 
+      </li> 
+      <li>
+<span class="active-toc">Kudu Documentation Style Guide</span>
+            <ul class="sectlevel1">
+<li><a href="#_asciidoc">Asciidoc</a></li>
+<li><a href="#_code_standards">Code Standards</a></li>
+<li><a href="#_building_documentation">Building Documentation</a></li>
+<li><a href="#_asciidoc_style_guide">Asciidoc Style Guide</a></li>
+</ul> 
+      </li> 
+      <li>
+
+          <a href="configuration_reference.html">Kudu Configuration Reference</a> 
+      </li> 
+  </ul>
+  </div>
+    </div>
+  </div>
+</div>
\ No newline at end of file


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