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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-49547] ephemeralForTest needs to keep track of the available history based on the oldest timestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-49547</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We need a way to keep track of the available history which allows us to open a snapshot at a point-in-time for new storage transactions. Ideally, the best spot for this would be in the KVEngine as a sorted map keyed with a Timestamp that holds a shared_ptr to the StringStore.&lt;/p&gt;

&lt;p&gt;Having this available history also lets us determine what the&#160;&lt;b&gt;oldest timestamp&lt;/b&gt; should be.&lt;/p&gt;

&lt;p&gt;As long as there are other open storage transactions with &lt;b&gt;active&lt;/b&gt; snapshots, those snapshots must be kept in the available history map until the last storage transaction closes its snapshot and notifies the KVEngine to allow the KVEngine to clean up the available history map appropriately based on the reference count and &lt;b&gt;oldest timestamp&lt;/b&gt;.&lt;/p&gt;

&lt;p&gt;When a transaction closes its snapshot, it&apos;s also going to drop its shared_ptr references to any StringStores it held onto. If the snapshot that&apos;s being closed was the last reference (excluding the reference from the available history map) to any of the StringStores it held onto, then we must notify the KVEngine so that it can remove the appropriate StringStores from the available history and update the &lt;b&gt;oldest timestamp&lt;/b&gt;&#160;appropriately.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Note&lt;/b&gt;: As StringStore&apos;s aren&apos;t timestamped when merged in today, we can temporarily assign each consecutive merge an incrementing timestamp to be able to avoid collisions in the available history map.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1412151">SERVER-49547</key>
            <summary>ephemeralForTest needs to keep track of the available history based on the oldest timestamp</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="bynn.lee@mongodb.com">Bynn Lee</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                            <label>intern_ephemeral_for_test</label>
                    </labels>
                <created>Thu, 16 Jul 2020 14:55:55 +0000</created>
                <updated>Sun, 29 Oct 2023 22:05:45 +0000</updated>
                            <resolved>Mon, 3 Aug 2020 19:24:12 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3318366" author="xgen-internal-githook" created="Mon, 3 Aug 2020 19:10:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bynn Lee&apos;, &apos;email&apos;: &apos;bynn.lee@mongodb.com&apos;, &apos;username&apos;: &apos;bynn&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49547&quot; title=&quot;ephemeralForTest needs to keep track of the available history based on the oldest timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49547&quot;&gt;&lt;del&gt;SERVER-49547&lt;/del&gt;&lt;/a&gt; ephemeralForTest needs to keep track of the available history for storage transactions with open snapshots&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/927f7ecc749db6c83b6a5d34b0397fc004f5517c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/927f7ecc749db6c83b6a5d34b0397fc004f5517c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3316539" author="xgen-internal-githook" created="Fri, 31 Jul 2020 21:36:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bynn Lee&apos;, &apos;email&apos;: &apos;bynn.lee@mongodb.com&apos;, &apos;username&apos;: &apos;bynn&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49547&quot; title=&quot;ephemeralForTest needs to keep track of the available history based on the oldest timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49547&quot;&gt;&lt;del&gt;SERVER-49547&lt;/del&gt;&lt;/a&gt; ephemeralForTest needs to keep track of the available history for storage transactions with open snapshots&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 70a223895e7d3ffd182d93518e58ec2961c6895f.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e3fe508733bcc375f3d4de1adbe1bd6d722c0025&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e3fe508733bcc375f3d4de1adbe1bd6d722c0025&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3315882" author="xgen-internal-githook" created="Fri, 31 Jul 2020 15:51:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bynn Lee&apos;, &apos;email&apos;: &apos;bynn.lee@mongodb.com&apos;, &apos;username&apos;: &apos;bynn&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49547&quot; title=&quot;ephemeralForTest needs to keep track of the available history based on the oldest timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49547&quot;&gt;&lt;del&gt;SERVER-49547&lt;/del&gt;&lt;/a&gt; ephemeralForTest needs to keep track of the available history for storage transactions with open snapshots&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/70a223895e7d3ffd182d93518e58ec2961c6895f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/70a223895e7d3ffd182d93518e58ec2961c6895f&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="1356702">SERVER-48314</issuekey>
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            <issuekey id="1412383">SERVER-49553</issuekey>
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