forked from docs/doc-exports
Ru, Li Yi
cd74617674
Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com> Co-authored-by: Ru, Li Yi <liyiru7@huawei.com> Co-committed-by: Ru, Li Yi <liyiru7@huawei.com>
22 lines
2.3 KiB
HTML
22 lines
2.3 KiB
HTML
<a name="dds_01_0002"></a><a name="dds_01_0002"></a>
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<h1 class="topictitle1">Cluster</h1>
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<div id="body1529654902838"><p id="dds_01_0002__p03931746111514">Each DDS cluster consists of a config node, and multiple dds mongos and shard nodes. The following diagram shows the node relationships.</p>
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<div class="fignone" id="dds_01_0002__fig921302217450"><span class="figcap"><b>Figure 1 </b>Diagram of node relationships</span><br><span><img id="dds_01_0002__image1921411225458" src="en-us_image_0000001845343652.png"></span></div>
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<div class="section" id="dds_01_0002__section2471635113117"><h4 class="sectiontitle">dds mongos</h4><p id="dds_01_0002__p5397278143035">A dds mongos is a router for reading and writing data, providing a unified interface for accessing DB instances.</p>
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<ul id="dds_01_0002__ul7747113611462"><li id="dds_01_0002__li1782033319534">Each DB instance has 2 to 32 dds mongos. You can specify the quantity.</li><li id="dds_01_0002__li474733612462">A dds mongos reads configuration settings from configs and allocates read and write requests to shards. You can connect to a dds mongos directly.</li></ul>
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</div>
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<div class="section" id="dds_01_0002__section109912514314"><h4 class="sectiontitle">config</h4><p id="dds_01_0002__p49633946153220">A config stores configuration settings for DB instances and consists of one replica set.</p>
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<ul id="dds_01_0002__ul17872294911"><li id="dds_01_0002__li158713234917">The availability of a config is the prerequisite to deploying a DB instance or modifying the instance information.</li><li id="dds_01_0002__li787112154919">You cannot connect to a config directly.</li></ul>
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</div>
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<div class="section" id="dds_01_0002__section16795142043220"><h4 class="sectiontitle">shard</h4><p id="dds_01_0002__p32858642161053">In the cluster instance, shards are used to store user data.</p>
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<ul id="dds_01_0002__ul165293820493"><li id="dds_01_0002__li9973142115417">Each cluster instance has 2 to 32 shards. You can specify the quantity.</li><li id="dds_01_0002__li55295884911">Each shard is deployed as a replica set to ensure data redundancy and high reliability.</li><li id="dds_01_0002__li155291189493">You cannot connect to a shard directly.</li></ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_01_0001.html">Basic Concepts</a></div>
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</div>
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</div>
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