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| <h1>Prefix based File System Optimization</h1> |
| |
| <!--- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| --> |
| <p>The prefix-based File System Optimization feature supports atomic rename and delete of any directory at any level in the |
| namespace in deterministic/constant time.</p> |
| <p>This feature can be enabled for each specific bucket that requires it by setting the <code>--layout</code> flag |
| to <code>FILE_SYSTEM_OPTIMIZED</code> at the time of bucket creation.</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-bash" data-lang="bash">ozone sh bucket create /<volume-name>/<bucket-name> --layout FILE_SYSTEM_OPTIMIZED |
| </code></pre></div><p>Note: File System Optimization favors Hadoop Compatible File System instead of S3 compatibility. Some irregular S3 key |
| names may be rejected or normalized.</p> |
| <p>This feature is strongly recommended to be turned ON for Ozone buckets mainly used via Hadoop compatible interfaces, |
| especially with high number of files in deep directory hierarchy.</p> |
| <h2 id="ozonemanager-metadata-layout-format">OzoneManager Metadata layout format</h2> |
| <p>OzoneManager supports two metadata bucket layout formats - Object Store (OBS) and File System Optimized (FSO).</p> |
| <p>Object Store (OBS) is the existing OM metadata format, which stores key entry with full path name. In File System |
| Optimized (FSO) buckets, OM metadata format stores intermediate directories into <code>DirectoryTable</code> and files |
| into <code>FileTable</code> as shown in the below picture. The key to the table is the name of a directory or a file prefixed by |
| the unique identifier of its parent directory, <code><parent unique-id>/<filename></code>.</p> |
| <p> |
| |
| <img src="PrefixFSO-Format.png" alt='Prefix FSO Format' class="img-responsive" /></p> |
| <h3 id="directory-delete-operation-with-prefix-layout">Directory delete operation with prefix layout:</h3> |
| <p>Following picture describes the OM metadata changes while performing a delete |
| operation on a directory.</p> |
| <p> |
| |
| <img src="PrefixFSO-Delete.png" alt='Prefix FSO Delete' class="img-responsive" /></p> |
| <h3 id="directory-rename-operation-with-prefix-layout">Directory rename operation with prefix layout:</h3> |
| <p>Following picture describes the OM metadata changes while performing a rename |
| operation on a directory.</p> |
| <p> |
| |
| <img src="PrefixFSO-Rename.png" alt='Prefix FSO Rename' class="img-responsive" /></p> |
| <h2 id="configuration">Configuration</h2> |
| <p>The following configuration can be configured in <code>ozone-site.xml</code> to define the default value for bucket layout during bucket creation |
| if the client has not specified the bucket layout argument. |
| Supported values are <code>OBJECT_STORE</code>, <code>FILE_SYSTEM_OPTIMIZED</code> and <code>LEGACY</code>.</p> |
| <p>By default, this config value is empty. Ozone will default to <code>FILE_SYSTEM_OPTIMIZED</code> bucket layout if it finds an empty config value.</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-XML" data-lang="XML"> |
| <span style="color:#f92672"><property></span> |
| <span style="color:#f92672"><name></span>ozone.default.bucket.layout<span style="color:#f92672"></name></span> |
| <span style="color:#f92672"><value/></span> |
| <span style="color:#f92672"></property></span> |
| </code></pre></div> |
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