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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="介绍">介绍</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 map 的形式存储在该表的元数据中（Thrift 结构 <code class="language-plaintext highlighter-rouge">app_info</code> 中），并持久化到 Apache Zookeeper 上。</p> |
| |
| <p>通过 shell 工具的 <a href="/zh/docs/tools/shell/#ls"><code class="language-plaintext highlighter-rouge">ls</code> 命令</a> 查看表信息，最后一列 <code class="language-plaintext highlighter-rouge">envs_count</code> 指明了该表的环境变量个数。例如：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> ls |
| [general_info] |
| app_id status app_name app_type partition_count replica_count is_stateful create_time drop_time drop_expire envs_count |
| 2 AVAILABLE temp pegasus 8 3 true 2024-04-15_06:58:38 - - 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 Apache Zookeeper 上。</li> |
| <li>可以通过命令行动态修改，修改成功后会立即更新到 Apache Zookeeper 上。</li> |
| <li>通过 Meta Server 和 Replica Server 的周期性同步消息 <code class="language-plaintext highlighter-rouge">config_sync</code> 同步给各个 Replica Server 生效。 |
| <blockquote> |
| <p>由于是周期性同步，所以环境变量更新后可能不会在 Replica Server 上立即生效，而是有一个延迟。这个延迟时间依赖于配置 <code class="language-plaintext highlighter-rouge">config_sync_interval_ms</code> 的值，默认是 30 秒。</p> |
| </blockquote> |
| </li> |
| <li>环境变量的 key 通常使用 <code class="language-plaintext highlighter-rouge">.</code> 分隔，方便分类。</li> |
| </ul> |
| |
| <p>目前通过 table 环境变量支持的功能如：</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="控制命令">控制命令</h1> |
| |
| <p>Pegasus 的 <a href="/zh/docs/tools/shell/">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 <table_name></code> 选择需要操作的表。</p> |
| |
| <h2 id="get_app_envs">get_app_envs</h2> |
| |
| <p>参考：<a href="/zh/docs/tools/shell/#get_app_envs"><code class="language-plaintext highlighter-rouge">get_app_envs</code> 命令</a></p> |
| |
| <h2 id="set_app_envs">set_app_envs</h2> |
| |
| <p>参考：<a href="/zh/docs/tools/shell/#set_app_envs"><code class="language-plaintext highlighter-rouge">set_app_envs</code> 命令</a></p> |
| |
| <h2 id="del_app_envs">del_app_envs</h2> |
| |
| <p>参考：<a href="/zh/docs/tools/shell/#del_app_envs"><code class="language-plaintext highlighter-rouge">del_app_envs</code> 命令</a></p> |
| |
| <h2 id="clear_app_envs">clear_app_envs</h2> |
| |
| <p>参考：<a href="/zh/docs/tools/shell/#clear_app_envs"><code class="language-plaintext highlighter-rouge">clear_app_envs</code> 命令</a></p> |
| |
| <h1 id="支持的环境变量">支持的环境变量</h1> |
| |
| <p>从 Pegasus 2.6 开始，可通过 Meta Server 的 <a href="/zh/api/http">HTTP 接口</a> <code class="language-plaintext highlighter-rouge">/envs/list</code> 获取所有支持的 table 环境变量。 |
| 例如：</p> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$ curl 127.0.0.1:34601/envs/list |
| { |
| "business.info": { |
| "limitation": "", |
| "sample": "", |
| "type": "string" |
| }, |
| "default_ttl": { |
| "limitation": ">= 0", |
| "sample": "86400", |
| "type": "unsigned int32" |
| }, |
| "manual_compact.disabled": { |
| "limitation": "true | false", |
| "sample": "true", |
| "type": "bool" |
| }, |
| "manual_compact.max_concurrent_running_count": { |
| "limitation": ">= 0", |
| "sample": "8", |
| "type": "unsigned int32" |
| }, |
| "manual_compact.once.bottommost_level_compaction": { |
| "limitation": "force | skip", |
| "sample": "skip", |
| "type": "string" |
| }, |
| "manual_compact.once.target_level": { |
| "limitation": "-1 or >= 1", |
| "sample": "6", |
| "type": "unsigned int64" |
| }, |
| "manual_compact.once.trigger_time": { |
| "limitation": "> 0, timestamp (in seconds) to trigger the once manual compaction", |
| "sample": "1700000000", |
| "type": "unsigned int64" |
| }, |
| "manual_compact.periodic.bottommost_level_compaction": { |
| "limitation": "force | skip", |
| "sample": "skip", |
| "type": "string" |
| }, |
| "manual_compact.periodic.target_level": { |
| "limitation": "-1 or >= 1", |
| "sample": "6", |
| "type": "unsigned int64" |
| }, |
| "manual_compact.periodic.trigger_time": { |
| "limitation": "", |
| "sample": "", |
| "type": "string" |
| }, |
| "replica.backup_request_throttling": { |
| "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>", |
| "sample": "10000*delay*100,20000*reject*100", |
| "type": "string" |
| }, |
| "replica.deny_client_request": { |
| "limitation": "timeout*all | timeout*write | timeout*read | reconfig*all | reconfig*write | reconfig*read", |
| "sample": "timeout*all", |
| "type": "string" |
| }, |
| "replica.read_throttling": { |
| "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>", |
| "sample": "10000*delay*100,20000*reject*100", |
| "type": "string" |
| }, |
| "replica.read_throttling_by_size": { |
| "limitation": "", |
| "sample": "20000*delay*100,20000*reject*100", |
| "type": "string" |
| }, |
| "replica.rocksdb_block_cache_enabled": { |
| "limitation": "true | false", |
| "sample": "true", |
| "type": "bool" |
| }, |
| "replica.rocksdb_iteration_threshold_time_ms": { |
| "limitation": ">= 0", |
| "sample": "1000", |
| "type": "unsigned int64" |
| }, |
| "replica.slow_query_threshold": { |
| "limitation": ">= 20", |
| "sample": "1000", |
| "type": "unsigned int64" |
| }, |
| "replica.split.validate_partition_hash": { |
| "limitation": "true | false", |
| "sample": "true", |
| "type": "bool" |
| }, |
| "replica.write_throttling": { |
| "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>", |
| "sample": "10000*delay*100,20000*reject*100", |
| "type": "string" |
| }, |
| "replica.write_throttling_by_size": { |
| "limitation": "<size[K|M]>*<delay|reject>*<milliseconds>", |
| "sample": "10000*delay*100,20000*reject*100", |
| "type": "string" |
| }, |
| "replica_access_controller.allowed_users": { |
| "limitation": "", |
| "sample": "", |
| "type": "string" |
| }, |
| "replica_access_controller.ranger_policies": { |
| "limitation": "", |
| "sample": "", |
| "type": "string" |
| }, |
| "rocksdb.allow_ingest_behind": { |
| "limitation": "true | false", |
| "sample": "true", |
| "type": "bool" |
| }, |
| "rocksdb.checkpoint.reserve_min_count": { |
| "limitation": "> 0", |
| "sample": "2", |
| "type": "unsigned int32" |
| }, |
| "rocksdb.checkpoint.reserve_time_seconds": { |
| "limitation": ">= 0", |
| "sample": "3600", |
| "type": "unsigned int32" |
| }, |
| "rocksdb.num_levels": { |
| "limitation": "In range [1, 10]", |
| "sample": "6", |
| "type": "unsigned int64" |
| }, |
| "rocksdb.usage_scenario": { |
| "limitation": "bulk_load | normal | prefer_write", |
| "sample": "normal", |
| "type": "string" |
| }, |
| "rocksdb.write_buffer_size": { |
| "limitation": "In range [16777216, 536870912]", |
| "sample": "16777216", |
| "type": "unsigned int64" |
| }, |
| "user_specified_compaction": { |
| "limitation": "", |
| "sample": "", |
| "type": "string" |
| } |
| } |
| </code></pre></div></div> |
| |
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