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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-27746] Integrate LogicalClock with oplog</title>
                <link>https://jira.mongodb.org/browse/SERVER-27746</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once this task is implemented we will have functionally equivalent to existing global_timestamp  implementation that uses LogicalClock and LogicalTime classes.&lt;br/&gt;
The follow up performance test is required to confirm that the mutex based serialization does not introduce performance degradation.&lt;/p&gt;

&lt;p&gt;1) Add LogicalClock to serverContext &lt;br/&gt;
To place it on ServiceContext add member&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;std::unique_ptr&amp;lt;LogicalClock&amp;gt; _logicalClock;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;and provide an accessor&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;LogicalClock* getLogicalClock() const;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;2) use LogicalClock with oplog instead of global_timestamp defined function calls.&lt;br/&gt;
This will include changing the set(time) &lt;/p&gt;
{ return (time +1) }
&lt;p&gt;get() &lt;/p&gt;
{return time-1 }
&lt;p&gt; behavior&lt;br/&gt;
&lt;a href=&quot;https://github.com/mikety/mongo/blob/v3.4/src/mongo/db/global_timestamp.cpp#L44-L51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mikety/mongo/blob/v3.4/src/mongo/db/global_timestamp.cpp#L44-L51&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Its implemented this way to support reserving ticks currently needed at oplog &lt;a href=&quot;https://github.com/mikety/mongo/blob/v3.4/src/mongo/db/repl/oplog.cpp#L162&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mikety/mongo/blob/v3.4/src/mongo/db/repl/oplog.cpp#L162&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;3) replace all usages of global_timestamp defined function calls and remove the file.&lt;/p&gt;

&lt;p&gt;4) verify that there are no BF.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="346844">SERVER-27746</key>
            <summary>Integrate LogicalClock with oplog</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="9">Done</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Jan 2017 00:00:24 +0000</created>
                <updated>Wed, 5 Apr 2017 11:43:33 +0000</updated>
                            <resolved>Wed, 15 Feb 2017 19:56:47 +0000</resolved>
                                                    <fixVersion>3.5.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1499588" author="xgen-internal-githook" created="Wed, 15 Feb 2017 19:53:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;mikety&apos;, u&apos;name&apos;: u&apos;Misha Tyulenev&apos;, u&apos;email&apos;: u&apos;misha@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27746&quot; title=&quot;Integrate LogicalClock with oplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27746&quot;&gt;&lt;del&gt;SERVER-27746&lt;/del&gt;&lt;/a&gt;: Integrate LogicalClock with oplog&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7d36244539cff23adb813f9cc006b1e9fe4305e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7d36244539cff23adb813f9cc006b1e9fe4305e0&lt;/a&gt;&lt;/p&gt;</comment>
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