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    <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-20439] Use OpTimes as SnapshotNames</title>
                <link>https://jira.mongodb.org/browse/SERVER-20439</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of the work on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19212&quot; title=&quot;New indexes shouldn&amp;#39;t be usable until they are in the committed view&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19212&quot;&gt;&lt;del&gt;SERVER-19212&lt;/del&gt;&lt;/a&gt; we made SnapshotNames be a simple monotonically increasing counter rather than using names derived from OpTimes. This made it possible to establish a happens before/after relationship between snapshots and events that do not change the OpTime, including background index builds on secondaries, and reindex and repair operations. This had the downside of introducing an additional notion of time that had to be tracked to ensure that w:majority could fulfil its full contract.&lt;/p&gt;

&lt;p&gt;We now think these operations can simply use an OpTime &amp;gt; now and request the creation of a new OpTime (on an &apos;n&apos; oplog entry) using a back channel such as heartbeats to handle a steady-state idle system where newer writes are not coming in. This will need to use an OpTime &amp;gt; now both as the last OpTime for the client and as the minimum OpTimes for collections and indexes. This should enable us to undo the change from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20260&quot; title=&quot;New indexes should bump their Collection&amp;#39;s minimum SnapshotName&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20260&quot;&gt;&lt;del&gt;SERVER-20260&lt;/del&gt;&lt;/a&gt; which was a temporary solution to this problem.&lt;/p&gt;</description>
                <environment></environment>
        <key id="230104">SERVER-20439</key>
            <summary>Use OpTimes as SnapshotNames</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="9">Done</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Sep 2015 17:58:06 +0000</created>
                <updated>Tue, 6 Dec 2022 04:44:18 +0000</updated>
                            <resolved>Mon, 26 Feb 2018 14:44:48 +0000</resolved>
                                                                    <component>Internal Code</component>
                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1815915" author="milkie" created="Mon, 26 Feb 2018 14:44:48 +0000"  >&lt;p&gt;SnapshotName was removed as part of the deployment of timestamps to all operations, so the work this ticket describes is now in effect.&lt;/p&gt;</comment>
                            <comment id="1033742" author="xgen-internal-githook" created="Thu, 17 Sep 2015 22:21:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20260&quot; title=&quot;New indexes should bump their Collection&amp;#39;s minimum SnapshotName&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20260&quot;&gt;&lt;del&gt;SERVER-20260&lt;/del&gt;&lt;/a&gt; New indexes should bump their Collection&apos;s minimum SnapshotName&lt;/p&gt;

&lt;p&gt;This is a temporary solution to ensure that indexes created with w:majority&lt;br/&gt;
are guaranteed to be usable to a read using majority readConcern level. These&lt;br/&gt;
changes will be made undone once we complete the work of reunifying OpTime and&lt;br/&gt;
SnapshotName for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20439&quot; title=&quot;Use OpTimes as SnapshotNames&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20439&quot;&gt;&lt;del&gt;SERVER-20439&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/480df0c4376f5faa572ba031e53483f071cf1423&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/480df0c4376f5faa572ba031e53483f071cf1423&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="434754">SERVER-31304</issuekey>
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            <issuekey id="228147">SERVER-20260</issuekey>
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