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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-49189] Make the ReadThroughCache lookup send the old entry state to the lookup function</title>
                <link>https://jira.mongodb.org/browse/SERVER-49189</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ReadThroughCache lookup function can return a LookupResult with a value of boost::none to inicate the lookup didn&apos;t found any result. As written in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/54cc38653d534ae51c6153e04d52ee7c58aa5b6e/src/mongo/util/read_through_cache.h#L204-L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this comment&lt;/a&gt;, in those cases the time field of the LookupResult need to reflect the time for which the lookup request was issued. The problem is that in the scope of the LookupFn we don&apos;t have such a value, we only knows the key for which the lookup have been issued but not the time at which it was issued.&lt;/p&gt;



&lt;p&gt;Moreover this will be required in order to use the ReadThroughCache to store collection routing information. In fact the future lookup function of such instantiation &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dc3e5ecd374bc85d2fa4547e8c238a0b6ca5b550/src/mongo/s/catalog_cache.cpp#L684&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;will need access to the old routing information previously cached&lt;/a&gt; in order to perform an incremental refresh.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1395585">SERVER-49189</key>
            <summary>Make the ReadThroughCache lookup send the old entry state to the lookup function</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="kevin.pulo@mongodb.com">Kevin Pulo</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>PM-1645-Milestone-2</label>
                    </labels>
                <created>Tue, 30 Jun 2020 12:43:45 +0000</created>
                <updated>Sun, 29 Oct 2023 22:06:19 +0000</updated>
                            <resolved>Thu, 23 Jul 2020 06:15:58 +0000</resolved>
                                    <version>Backlog</version>
                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Catalog</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3306782" author="xgen-internal-githook" created="Mon, 27 Jul 2020 06:39:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;username&apos;: &apos;devkev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49189&quot; title=&quot;Make the ReadThroughCache lookup send the old entry state to the lookup function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49189&quot;&gt;&lt;del&gt;SERVER-49189&lt;/del&gt;&lt;/a&gt; add missed minor tweaks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21a3ee6079eb3cc83a5210cf53d98840cbc83a20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21a3ee6079eb3cc83a5210cf53d98840cbc83a20&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3298092" author="xgen-internal-githook" created="Thu, 23 Jul 2020 05:57:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;username&apos;: &apos;devkev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49189&quot; title=&quot;Make the ReadThroughCache lookup send the old entry state to the lookup function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49189&quot;&gt;&lt;del&gt;SERVER-49189&lt;/del&gt;&lt;/a&gt; pass current cachedValue (and time, if causally consistent) to ReadThroughCache::LookupFn&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6b5b168edf19e336dacff0a8c54a9dd1f32ed1e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6b5b168edf19e336dacff0a8c54a9dd1f32ed1e2&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1152467">SERVER-46202</issuekey>
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            <issuekey id="1419884">SERVER-49856</issuekey>
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