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| <p class="title is-size-2 is-centered">Redis适配</p> |
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| <section class="section" style="padding-top: 2rem;"> |
| <div class="content"> |
| <h1 id="redis适配">Redis适配</h1> |
| |
| <h2 id="架构">架构</h2> |
| |
| <p>在pegasus上添加了redis proxy后，用户可以通过redis协议直接访问proxy，从而间接访问pegasus服务。整体架构如下：</p> |
| |
| <p><img src="/assets/images/redis_proxy_arch.png" alt="redis_proxy_arch.png" class="img-responsive" /></p> |
| |
| <p>redis客户端与redis proxy之间使用<a href="https://redis.io/topics/protocol">redis协议</a>，目前proxy已支持所有redis 数据类型（Simple Strings、Errors、Integers、Bulk Strings、Arrays）。</p> |
| |
| <p>redis proxy与pegasus集群之间使用pegasus的thrift协议，proxy在这里就类似一个普通的pegasus client，从meta server查询meta信息、与replica server进行用户数据的读写。</p> |
| |
| <h2 id="提供服务的形式">提供服务的形式</h2> |
| |
| <p>跟redis服务一样，以<code class="language-plaintext highlighter-rouge">host:port</code>形式提供，如果服务压力大，可以提供多个<code class="language-plaintext highlighter-rouge">host:port</code>来避免单点proxy压力过大造成瓶颈。当提供多个redis proxy地址时，由于后端访问的都是同一个集群的同一张表，数据是完全相同的。用户可以采用round robin, hash等方式进行负载均衡。</p> |
| |
| <blockquote> |
| <p>proxy的可执行文件为<code class="language-plaintext highlighter-rouge">pegasus_rproxy</code>, 由<code class="language-plaintext highlighter-rouge">./run.sh pack_tools</code>打包生成。</p> |
| </blockquote> |
| |
| <h2 id="配置">配置</h2> |
| |
| <p>redis proxy的配置文件规则遵循<a href="/zh/administration/config">配置说明</a>，参考<a href="https://github.com/apache/incubator-pegasus/blob/master/src/geo/bench/config.ini">示例</a>。</p> |
| |
| <p>在redis proxy中有几项特有的配置项需要注意：</p> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>[apps.proxy] |
| name = proxy |
| type = proxy |
| ; which pegasus cluster and table dose this proxy redirect to |
| ; 'onebox' is the cluster name which will be used in the next section |
| ; 'temp' is the table name in the cluster |
| arguments = onebox temp |
| ; if using GEO APIs, an extra table name which will store geo index data |
| ; should be appended, i.e. |
| ; arguments = onebox temp temp_geo |
| ; port serve for redis clients |
| ports = 6379 |
| pools = THREAD_POOL_DEFAULT |
| run = true |
| |
| [pegasus.clusters] |
| ; meta serer list the proxy redirect to |
| onebox = 127.0.0.1:34601,127.0.0.1:34602,127.0.0.1:34603 |
| </code></pre></div></div> |
| |
| <h2 id="apis">APIs</h2> |
| |
| <p>redis的原生命令请见<a href="https://redis.io/commands">这里</a> 。</p> |
| |
| <p>以下接口说明都兼容redis原生命令，但支持的参数可能少于redis，以下接口说明中都给出了目前Pegasus代理所支持的所有参数，未给出的目前不支持。</p> |
| |
| <h3 id="key规则">KEY规则</h3> |
| |
| <h4 id="kv-api">KV API</h4> |
| |
| <p>对于redis的普通key-value操作，key对应到Pegasus中的hashkey，而Pegasus中的sortkey被设置为空串<code class="language-plaintext highlighter-rouge">""</code>。如<code class="language-plaintext highlighter-rouge">SET</code>, <code class="language-plaintext highlighter-rouge">GET</code>, <code class="language-plaintext highlighter-rouge">TTL</code>, <code class="language-plaintext highlighter-rouge">INCR</code>等。</p> |
| |
| <h4 id="geo-api">GEO API</h4> |
| |
| <p>在原生redis中，<code class="language-plaintext highlighter-rouge">GEO*</code>接口操作的数据是通过<code class="language-plaintext highlighter-rouge">GEOADD key longitude latitude member</code>添加到数据库中的，这时<code class="language-plaintext highlighter-rouge">key</code>是一个namespace的概念，而不是<code class="language-plaintext highlighter-rouge">SET</code>操作时的key。</p> |
| |
| <p>而pegasus proxy的<code class="language-plaintext highlighter-rouge">GEO*</code>接口操作的数据是通过<code class="language-plaintext highlighter-rouge">SET</code>接口添加到数据库中的，<code class="language-plaintext highlighter-rouge">SET</code>的key对应于<code class="language-plaintext highlighter-rouge">GEO*</code>接口的member，而<code class="language-plaintext highlighter-rouge">GEO*</code>接口的key则只能是<code class="language-plaintext highlighter-rouge">""</code>。也就是说，在pegasus 的redis GEO数据中，不再有namespace的概念，全部数据在同一空间<code class="language-plaintext highlighter-rouge">""</code>下，若要区分key空间，则可以在pegasus层创建新的table实现。具体参考后面的示例。</p> |
| |
| <h3 id="set">SET</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>SET key value [EX seconds] |
| </code></pre></div></div> |
| |
| <h3 id="get">GET</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>GET key |
| </code></pre></div></div> |
| |
| <h3 id="del">DEL</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>DEL key |
| </code></pre></div></div> |
| |
| <p>注意：</p> |
| |
| <ol> |
| <li>这里的接口返回值和redis的定义略有不同：当key不存在时，redis接口返回0，这里则返回1。</li> |
| </ol> |
| |
| <h3 id="setex">SETEX</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>SETEX key seconds value |
| </code></pre></div></div> |
| |
| <h3 id="ttl">TTL</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>TTL key |
| </code></pre></div></div> |
| |
| <h3 id="pttl">PTTL</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>PTTL key |
| </code></pre></div></div> |
| |
| <h3 id="incr">INCR</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>INCR key |
| </code></pre></div></div> |
| |
| <h3 id="incrby">INCRBY</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>INCRBY key increment |
| </code></pre></div></div> |
| |
| <h3 id="decr">DECR</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>DECR key |
| </code></pre></div></div> |
| |
| <h3 id="decrby">DECRBY</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>DECRBY key decrement |
| </code></pre></div></div> |
| |
| <h3 id="geodist">GEODIST</h3> |
| |
| <p><a href="geo">GEO接口的实现原理</a></p> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>GEODIST key member1 member2 [unit] |
| </code></pre></div></div> |
| |
| <p>注意：</p> |
| |
| <ol> |
| <li>key规则遵循GEO API的key规则：这里的key只能是<code class="language-plaintext highlighter-rouge">""</code>，而这里member对应于<code class="language-plaintext highlighter-rouge">SET</code>操作时的key。</li> |
| </ol> |
| |
| <h3 id="georadius">GEORADIUS</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>GEORADIUS key longitude latitude radius m|km|ft|mi [WITHCOORD][WITHDIST] [WITHHASH][COUNT count] [ASC|DESC] |
| </code></pre></div></div> |
| |
| <p>注意：</p> |
| <ol> |
| <li>key规则遵循GEO API的key规则：这里的key只能是<code class="language-plaintext highlighter-rouge">""</code>，而这里member对应于<code class="language-plaintext highlighter-rouge">SET</code>操作时的key。</li> |
| <li>我们对redis的<code class="language-plaintext highlighter-rouge">WITHHASH</code>参数进行了修改，使用它将会返回该member的value。</li> |
| </ol> |
| |
| <h3 id="georadiusbymember">GEORADIUSBYMEMBER</h3> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>GEORADIUSBYMEMBER key member radius m|km|ft|mi [WITHCOORD][WITHDIST] [WITHHASH][COUNT count] [ASC|DESC] |
| </code></pre></div></div> |
| |
| <p>注意：</p> |
| <ol> |
| <li>key规则同上，这里的key只能是<code class="language-plaintext highlighter-rouge">""</code>，而这里member对应于<code class="language-plaintext highlighter-rouge">SET</code>操作时的key。</li> |
| <li>我们对redis的<code class="language-plaintext highlighter-rouge">WITHHASH</code>参数进行了修改，使用它将会返回该member的value。</li> |
| </ol> |
| |
| <h2 id="示例">示例</h2> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>127.0.0.1:6379> SET abc 1 EX 60 |
| OK |
| |
| 127.0.0.1:6379> GET abc |
| "1" |
| |
| 127.0.0.1:6379> TTL abc |
| (integer) 52 |
| |
| 127.0.0.1:6379> INCR abc |
| (integer) 2 |
| |
| // 以下是GEO API, 注意需要提前创建好geo表 |
| 127.0.0.1:6379> SET 1cc0001000010290050356f "1cc0001000010290050356f|2018-06-10 23:59:59|2018-06-11 13:00:00|wx5j5ff05|116.886447|40.269031|4.863045|20.563248|0|-1" |
| OK |
| |
| 127.0.0.1:6379> SET 2cc0001000010290050356f "2cc0001000010290050356f|2018-06-10 23:59:59|2018-06-11 13:00:00|wx5j5ff05|115.886447|41.269031|4.863045|20.563248|0|-1" |
| OK |
| |
| 127.0.0.1:6379> GEORADIUS "" 116.889137 40.261774 1000 m COUNT 100 ASC WITHDIST WITHCOORD |
| 1) 1) "1cc0001000010290050356f" |
| 2) "838.600772" |
| 3) 1) "116.886447" |
| 2) "40.269031" |
| 4) "1cc0001000010290050356f|2018-06-10 23:59:59|2018-06-11 13:00:00|wx5j5ff05|116.886447|40.269031|4.863045|20.563248|0|-1" |
| |
| 127.0.0.1:6379> GEORADIUSBYMEMBER "" 1cc0001000010290050356f 1000 m WITHCOORD WITHDIST WITHHASH |
| 1) 1) "1cc0001000010290050356f" |
| 2) "0.000000" |
| 3) 1) "116.886447" |
| 2) "40.269031" |
| 4) "1cc0001000010290050356f|2018-06-10 23:59:59|2018-06-11 13:00:00|wx5j5ff05|116.886447|40.269031|4.863045|20.563248|0|-1" |
| |
| 127.0.0.1:6379> GEODIST "" 1cc0001000010290050356f 2cc0001000010290050356f m |
| "139483.293598" |
| </code></pre></div></div> |
| |
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| <li><a href="#redis适配">Redis适配</a> |
| <ul> |
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| <ul> |
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