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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-46154] Make ReadThroughCache be driven by a vector clock</title>
                <link>https://jira.mongodb.org/browse/SERVER-46154</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of this change, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/876b3af1091b299884869c34a41f7f37d4dcc0bb/src/mongo/util/read_through_cache.h#L214&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ReadThroughCache&lt;/tt&gt;&lt;/a&gt;&apos;s template should be made to accept a separate parameter called &quot;Time&quot; (or alternatively it could be a required method on the &quot;Value&quot; type), which should be a sortable class, containing the vector clock timestamp of each value in the cache.&lt;/p&gt;

&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/876b3af1091b299884869c34a41f7f37d4dcc0bb/src/mongo/util/read_through_cache.h#L354&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;invalidate*&lt;/tt&gt;&lt;/a&gt; suite of methods should be replaced with an &lt;tt&gt;advanceTime(const Key&amp;amp; key, Time time)&lt;/tt&gt; method which cause the in-memory time of the specified &lt;tt&gt;key&lt;/tt&gt; to move forward, so that subsequent call to &lt;tt&gt;acquire&lt;/tt&gt; need to keep loading until the value fetched from the persisted store reaches &lt;tt&gt;time&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1149645">SERVER-46154</key>
            <summary>Make ReadThroughCache be driven by a vector clock</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="13201">Fixed</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-1645-Milestone-2</label>
                    </labels>
                <created>Fri, 14 Feb 2020 14:28:13 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:13 +0000</updated>
                            <resolved>Thu, 21 May 2020 06:00:21 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3098754" author="xgen-internal-githook" created="Thu, 21 May 2020 05:50:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46154&quot; title=&quot;Make ReadThroughCache be driven by a vector clock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46154&quot;&gt;&lt;del&gt;SERVER-46154&lt;/del&gt;&lt;/a&gt; Make ReadThroughCache support causal consistency&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a4c3cbd4060dc99e4aaa4a4472882e7995125431&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a4c3cbd4060dc99e4aaa4a4472882e7995125431&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3091369" author="xgen-internal-githook" created="Sun, 17 May 2020 15:16:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46154&quot; title=&quot;Make ReadThroughCache be driven by a vector clock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46154&quot;&gt;&lt;del&gt;SERVER-46154&lt;/del&gt;&lt;/a&gt; Pull the InProgressLookup outside of ReadThroughCache&lt;/p&gt;

&lt;p&gt;The InProgressLookup tracking already has quite complicated logic, so it&lt;br/&gt;
seems prudent to pull it into a separate class, outside of the&lt;br/&gt;
ReadThroughCache so it can be tested independently.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e2111ef33fc40959a254bd3109466176ae60718&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e2111ef33fc40959a254bd3109466176ae60718&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1039326">SERVER-44978</issuekey>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1152460">SERVER-46199</issuekey>
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            <issuelink>
            <issuekey id="1152467">SERVER-46202</issuekey>
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                                            <outwardlinks description="related to">
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            <issuekey id="1349563">SERVER-48181</issuekey>
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