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| <p class="title is-size-2 is-centered">Table环境变量</p> |
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| <section class="section" style="padding-top: 2rem;"> |
| <div class="content"> |
| <h1 id="功能目标">功能目标</h1> |
| |
| <p>为了对Table的一些行为进行控制，Pegasus提供了Table环境变量，又称之为<code class="language-plaintext highlighter-rouge">app envs</code>。</p> |
| |
| <p>Table环境变量以kv-map的形式存储在Table的元数据<code class="language-plaintext highlighter-rouge">app_info</code>中，并持久化到Zookeeper上。通过shell的<code class="language-plaintext highlighter-rouge">ls</code>命令查看表信息，最后一列<code class="language-plaintext highlighter-rouge">envs_count</code>记录Table环境变量的kv对个数：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> ls |
| app_id status app_name app_type partition_count replica_count is_stateful drop_expire_time envs_count |
| 1 AVAILABLE temp pegasus 8 3 true - 1 |
| </code></pre></div></div> |
| |
| <p>如果要查看具体的Table环境变量，则需要使用<a href="#get_app_envs">get_app_envs</a>命令。</p> |
| |
| <p>Table环境变量具有如下特性：</p> |
| <ul> |
| <li>作为Table的元数据持久化到Zookeeper上。</li> |
| <li>可以通过命令动态修改，修改成功后会立即更新到Zookeeper上。</li> |
| <li>通过meta server和replica server的定期同步消息<code class="language-plaintext highlighter-rouge">config_sync</code>同步给各个replica生效。由于是定期同步，所以环境变量更新后不会立即生效，而是有一个同步过程，这个过程的时间依赖于配置文件<code class="language-plaintext highlighter-rouge">config_sync_interval_ms</code>的值，默认是30秒。</li> |
| <li>环境变量的key通过都是采用<code class="language-plaintext highlighter-rouge">.</code>分隔的字段的形式，方便组织。</li> |
| </ul> |
| |
| <p>目前通过Table环境变量支持的功能包括：</p> |
| <ul> |
| <li><a href="manual-compact">Manual-Compact功能</a></li> |
| <li><a href="usage-scenario">Usage-Scenario功能</a></li> |
| </ul> |
| |
| <h1 id="操作命令">操作命令</h1> |
| <p>Pegasus的<a href="/zh/overview/shell#set_app_envs">Shell工具</a>中提供了操作Table环境变量的命令。这些命令执行前都需要先执行<code class="language-plaintext highlighter-rouge">use xxx</code>选择表。</p> |
| |
| <h2 id="get_app_envs">get_app_envs</h2> |
| <p>获取环境变量列表，用法：<code class="language-plaintext highlighter-rouge">get_app_envs</code></p> |
| |
| <p>示例：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> use temp |
| OK |
| >>> get_app_envs |
| get app envs succeed, count = 1 |
| ================================= |
| rocksdb.usage_scenario = normal |
| ================================= |
| </code></pre></div></div> |
| <h2 id="set_app_envs">set_app_envs</h2> |
| <p>设置环境变量，用法：<code class="language-plaintext highlighter-rouge">set_app_envs <key> <value> [key value...]</code></p> |
| |
| <p>示例：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> use temp |
| OK |
| >>> set_app_envs rocksdb.usage_scenario bulk_load |
| set app envs succeed |
| >>> get_app_envs |
| get app envs succeed, count = 1 |
| ================================= |
| rocksdb.usage_scenario = bulk_load |
| ================================= |
| </code></pre></div></div> |
| |
| <h2 id="del_app_envs">del_app_envs</h2> |
| <p>删除环境变量，用法：<code class="language-plaintext highlighter-rouge">del_app_envs <key> [key...]</code></p> |
| |
| <p>示例：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> use temp |
| OK |
| >>> del_app_envs rocksdb.usage_scenario |
| del app envs succeed |
| ============================= |
| deleted keys: |
| rocksdb.usage_scenario |
| ============================= |
| >>> get_app_envs |
| get app envs succeed, count = 0 |
| </code></pre></div></div> |
| |
| <h2 id="clear_app_envs">clear_app_envs</h2> |
| <p>清理环境变量，或者叫批量删除环境变量，用法：<code class="language-plaintext highlighter-rouge">clear_app_envs <-a|--all> <-p|--prefix str></code></p> |
| |
| <p>两种方式：</p> |
| <ul> |
| <li>全部清理：使用<code class="language-plaintext highlighter-rouge">-a</code>选项。</li> |
| <li>通过前缀清理：使用<code class="language-plaintext highlighter-rouge">-p</code>选项指定前缀，匹配时会先自动在前缀后面加上<code class="language-plaintext highlighter-rouge">.</code>，然后按照字符串前缀匹配。</li> |
| </ul> |
| |
| <p>譬如：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> use temp |
| OK |
| >>> set_app_envs k.x v1 k.y v2 |
| set app envs succeed |
| >>> get_app_envs |
| get app envs succeed, count = 2 |
| ================================= |
| k.x = v1 |
| k.y = v2 |
| ================================= |
| >>> clear_app_envs -p k |
| clear app envs succeed |
| ============================= |
| deleted keys: |
| k.x |
| k.y |
| ============================= |
| >>> get_app_envs |
| get app envs succeed, count = 0 |
| </code></pre></div></div> |
| |
| <h1 id="支持列表">支持列表</h1> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>key名称</th> |
| <th>value类型</th> |
| <th>value约束</th> |
| <th>value示例</th> |
| <th>功能说明</th> |
| <th>支持版本</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>rocksdb.usage_scenario</td> |
| <td>string</td> |
| <td>normal | prefer_write | bulk_load</td> |
| <td>bulk_load</td> |
| <td><a href="usage-scenario">Usage-Scenario</a></td> |
| <td>1.8.1</td> |
| </tr> |
| <tr> |
| <td>replica.deny_client_write</td> |
| <td>bool</td> |
| <td>true | false</td> |
| <td>true</td> |
| <td>拒绝写请求</td> |
| <td>1.11.2</td> |
| </tr> |
| <tr> |
| <td>replica.write_throttling</td> |
| <td>string</td> |
| <td>特定格式</td> |
| <td>1000*delay*100</td> |
| <td><a href="throttling#表级流控">流量控制#表级流控</a></td> |
| <td>1.11.2</td> |
| </tr> |
| <tr> |
| <td>replica.write_throttling_by_size</td> |
| <td>string</td> |
| <td>特定格式</td> |
| <td>1000*delay*100</td> |
| <td><a href="throttling#表级流控">流量控制#表级流控</a></td> |
| <td>1.12.0</td> |
| </tr> |
| <tr> |
| <td>default_ttl</td> |
| <td>int</td> |
| <td>>=0</td> |
| <td>86400</td> |
| <td><a href="/zh/api/ttl#表级TTL">表级TTL</a></td> |
| <td>1.11.2</td> |
| </tr> |
| <tr> |
| <td>manual_compact.disabled</td> |
| <td>bool</td> |
| <td>true | false</td> |
| <td>true</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.9.0</td> |
| </tr> |
| <tr> |
| <td>manual_compact.max_concurrent_running_count</td> |
| <td>int</td> |
| <td>>=0</td> |
| <td>10</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.11.3</td> |
| </tr> |
| <tr> |
| <td>manual_compact.once.trigger_time</td> |
| <td>int</td> |
| <td>Unix Timestamp in Seconds</td> |
| <td>1547091115</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.8.1</td> |
| </tr> |
| <tr> |
| <td>manual_compact.once.target_level</td> |
| <td>int</td> |
| <td>-1 | >=1</td> |
| <td>2</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.8.1</td> |
| </tr> |
| <tr> |
| <td>manual_compact.once.bottommost_level_compaction</td> |
| <td>string</td> |
| <td>force | skip</td> |
| <td>force</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.8.1</td> |
| </tr> |
| <tr> |
| <td>manual_compact.periodic.trigger_time</td> |
| <td>string</td> |
| <td>特定格式</td> |
| <td>3:00,5:00</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.8.1</td> |
| </tr> |
| <tr> |
| <td>manual_compact.periodic.target_level</td> |
| <td>int</td> |
| <td>-1 | >=1</td> |
| <td>2</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.8.1</td> |
| </tr> |
| <tr> |
| <td>manual_compact.periodic.bottommost_level_compaction</td> |
| <td>string</td> |
| <td>force | skip</td> |
| <td>force</td> |
| <td><a href="manual-compact">Manual-Compact</a></td> |
| <td>1.8.1</td> |
| </tr> |
| <tr> |
| <td>rocksdb.checkpoint.reserve_min_count</td> |
| <td>int</td> |
| <td>>=1</td> |
| <td>2</td> |
| <td><a href="resource-management#rocksdb-checkpoint管理">Rocksdb-Checkpoint管理</a></td> |
| <td>1.11.3</td> |
| </tr> |
| <tr> |
| <td>rocksdb.checkpoint.reserve_time_seconds</td> |
| <td>int</td> |
| <td>>=0</td> |
| <td>600</td> |
| <td><a href="resource-management#rocksdb-checkpoint管理">Rocksdb-Checkpoint管理</a></td> |
| <td>1.11.3</td> |
| </tr> |
| <tr> |
| <td>business.info</td> |
| <td>string</td> |
| <td>特定格式(使用utf-8编码)</td> |
| <td>depart=云平台部-存储平台,user=qinzuoyan&wutao1</td> |
| <td>记录表的业务归属信息，可用于生成账单</td> |
| <td>-</td> |
| </tr> |
| <tr> |
| <td>replica.slow_query_threshold</td> |
| <td>int</td> |
| <td>>=20</td> |
| <td>30</td> |
| <td>慢查询阈值</td> |
| <td>1.12.0</td> |
| </tr> |
| </tbody> |
| </table> |
| |
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