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<title>Distributed cache</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Distributed cache</span></span>

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In <a href="Computing" title="Computing">computing</a>, a <b>distributed cache</b> is an extension of the traditional concept of <a href="Cache_(computing)" title="Cache (computing)">cache</a> used in a single <a href="Locale_(computer_hardware)" title="Locale (computer hardware)">locale</a>. A distributed cache may span multiple servers so that it can grow in size and in transactional capacity. It is mainly used to store application data residing in <a href="Database" title="Database">database</a> and web <a href="Session_(computer_science)" title="Session (computer science)">session</a> data. The idea of distributed caching<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> has become feasible now because <a href="Random-access_memory" title="Random-access memory">main memory</a> has become very cheap and <a href="Network_interface_controller" title="Network interface controller">network cards</a> have become very fast, with 1 Gbit now standard everywhere and 10 Gbit gaining traction. Also, a distributed cache works well on lower cost machines usually employed for <a href="Web_server" title="Web server">web servers</a> as opposed to <a href="Database_server" title="Database server">database servers</a> which require expensive hardware.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

An emerging internet architecture known as <a href="Information-centric_networking" title="Information-centric networking">Information-centric networking</a> (ICN) is one of the best examples of a distributed cache network. The ICN is a network level solution hence the existing distributed network cache management schemes are not well suited for ICN.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> In the <a href="Supercomputer" title="Supercomputer">supercomputer</a> environment, distributed cache is typically implemented in the form of <a href="Burst_buffer" title="Burst buffer">burst buffer</a>.

</p><p>In distributed caching, each cache key is assigned to a specific <a href="Shard_(database_architecture)" title="Shard (database architecture)">shard</a> (a.k.a. partition). There are different sharding strategies:<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>

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<ul><li>Modulus sharding</li>

<li>Range-based sharding</li>

<li><a href="Consistent_hashing" title="Consistent hashing">Consistent hashing</a> evenly distributes cache keys across shards, even if some of the shards crash or become unavailable.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></li></ul>

<div class="mw-heading mw-heading2"><h2 id="Examples">Examples</h2></div>

<ul><li><a href="Aerospike_(database)" title="Aerospike (database)">Aerospike</a></li>

<li><a href="Apache_Ignite" title="Apache Ignite">Apache Ignite</a></li>

<li><a href="Couchbase_Server" title="Couchbase Server">Couchbase</a></li>

<li><a href="Ehcache" title="Ehcache">Ehcache</a></li>

<li><a href="GigaSpaces" title="GigaSpaces">GigaSpaces</a></li>

<li><a href="Hazelcast" title="Hazelcast">Hazelcast</a></li>

<li><a href="Infinispan" title="Infinispan">Infinispan</a></li>

<li><a href="Memcached" title="Memcached">Memcached</a></li>

<li><a href="Oracle_Coherence" title="Oracle Coherence">Oracle Coherence</a></li>

<li><a href="Redis" title="Redis">Redis</a></li>

<li><a href="Tarantool" title="Tarantool">Tarantool</a></li>

<li>Velocity/AppFabric</li></ul>

<ul><li><a href="Cache_algorithms" class="mw-redirect" title="Cache algorithms">Cache algorithms</a></li>

<li><a href="Cache_coherence" title="Cache coherence">Cache coherence</a></li>

<li><a href="Cache-oblivious_algorithm" title="Cache-oblivious algorithm">Cache-oblivious algorithm</a></li>

<li><a href="Cache_stampede" title="Cache stampede">Cache stampede</a></li>

<li><a href="Cache_language_model" title="Cache language model">Cache language model</a></li>

<li><a href="Database_cache" class="mw-redirect" title="Database cache">Database cache</a></li>

<li><a href="Cache_manifest_in_HTML5" title="Cache manifest in HTML5">Cache manifest in HTML5</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFPaulZ_Fei2001" class="citation journal cs1">Paul, S; Z Fei (1 February 2001). "Distributed caching with centralized control". <i>Computer Communications</i>. <b>24</b> (2): <span class="nowrap">256–</span>268. <a href="CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.38.1094">10.1.1.38.1094</a></span>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2FS0140-3664%2800%2900322-4">10.1016/S0140-3664(00)00322-4</a>.</cite></span>

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<cite id="CITEREFKhan" class="citation journal cs1">Khan, Iqbal. <a rel="nofollow" class="external text" href="http://msdn.microsoft.com/en-us/magazine/dd942840.aspx">"Distributed Caching on the Path To Scalability"</a>. <i>MSDN</i> (July 2009)<span class="reference-accessdate">. Retrieved <span class="nowrap">30 March</span> 2012</span>.</cite></span>

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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFBilal,_Muhammad2017" class="citation journal cs1">Bilal, Muhammad; et al. (2017). "A Cache Management Scheme for Efficient Content Eviction and Replication in Cache Networks". <i>IEEE Access</i>. <b>5</b>: <span class="nowrap">1692–</span>1701. <a href="ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/1702.04078">1702.04078</a></span>. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2017arXiv170204078B">2017arXiv170204078B</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FACCESS.2017.2669344">10.1109/ACCESS.2017.2669344</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:14517299">14517299</a>.</cite></span>

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<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite class="citation book cs1"><i>Foundations of Scalable Systems</i>. O'Reilly Media. 2022. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>9781098106034</bdi>.</cite></span>

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<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite class="citation book cs1"><i>Designing Distributed Systems Patterns and Paradigms for Scalable, Reliable Services</i>. O'Reilly Media. 2018. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>9781491983607</bdi>.</cite></span>

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