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            <title>[SERVER-57438] XOR based compression for doubles</title>
                <link>https://jira.mongodb.org/browse/SERVER-57438</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implement an encoder and decoder for the XOR based compression for double-precision floating-points as described in the &quot;Gorilla: A Fast, Scalable, In-Memory Time Series Database&quot; paper by Pelkonen et al.&lt;/p&gt;

&lt;p&gt;Doubles are XOR&apos;ed with previous value and number of leading and trailing zeroes in the result are counted. The remaining &quot;value&quot; bits are called meaningful bits.&lt;/p&gt;

&lt;p&gt;A bit stream is encoded with the following control bits followed by data:&lt;/p&gt;

&lt;p&gt;&apos;0&apos;: XOR yieleded zero (value is same as previous), nothing more to store.&lt;/p&gt;

&lt;p&gt;&apos;10&apos;: If number of leading and trailing zeros are at least as many as previous &apos;11&apos; state, we reuse these bits and store just the meaningful bits.&lt;/p&gt;

&lt;p&gt;&apos;11&apos;: count of leading zeros are stored in the next 5 bits, then number of meaningful bits are stored in the next 6 bits and last the actual meaningful bits are stored. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1768952">SERVER-57438</key>
            <summary>XOR based compression for doubles</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
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                <created>Fri, 4 Jun 2021 13:05:43 +0000</created>
                <updated>Tue, 6 Dec 2022 01:15:27 +0000</updated>
                            <resolved>Mon, 2 Aug 2021 20:09:58 +0000</resolved>
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