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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-45818] Increase default mirroring sampling rate</title>
                <link>https://jira.mongodb.org/browse/SERVER-45818</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Until we have reliable data on the efficacy of mirroring, the default sampling rate for command mirroring will be 0.0. Once we complete our testing, we should increase this to a reasonable fraction.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1118544">SERVER-45818</key>
            <summary>Increase default mirroring sampling rate</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="ben.caimano@mongodb.com">Benjamin Caimano</assignee>
                                    <reporter username="ben.caimano@mongodb.com">Benjamin Caimano</reporter>
                        <labels>
                    </labels>
                <created>Tue, 28 Jan 2020 16:37:11 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:48 +0000</updated>
                            <resolved>Mon, 2 Mar 2020 19:14:24 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2932133" author="kelly.lewis" created="Tue, 3 Mar 2020 15:52:17 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben.caimano&quot; class=&quot;user-hover&quot; rel=&quot;ben.caimano&quot;&gt;ben.caimano&lt;/a&gt;, are you able to close the 3 BFs depending on this ticket?&lt;/p&gt;</comment>
                            <comment id="2923487" author="xgen-internal-githook" created="Mon, 2 Mar 2020 19:11:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ben Caimano&apos;, &apos;email&apos;: &apos;ben.caimano@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45818&quot; title=&quot;Increase default mirroring sampling rate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45818&quot;&gt;&lt;del&gt;SERVER-45818&lt;/del&gt;&lt;/a&gt; Increase default mirroring rate&lt;/p&gt;

&lt;p&gt;This commit:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Introduces two new resmoke suites for max mirroring&lt;/li&gt;
	&lt;li&gt;Blacklists jstests/replsets/read_operations_during_step_up.js&lt;/li&gt;
	&lt;li&gt;Increases the default mirrorReads.samplingRate to 0.01&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1be1c6745a834847ea26afc9d21f9062f9952ca1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1be1c6745a834847ea26afc9d21f9062f9952ca1&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="2923486" author="xgen-internal-githook" created="Mon, 2 Mar 2020 19:11:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ben Caimano&apos;, &apos;email&apos;: &apos;ben.caimano@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45818&quot; title=&quot;Increase default mirroring sampling rate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45818&quot;&gt;&lt;del&gt;SERVER-45818&lt;/del&gt;&lt;/a&gt; Rework read mirroring infrastructure&lt;/p&gt;

&lt;p&gt;This commit:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Fixes a busy polling bug in the TopologyVersionObserver&lt;/li&gt;
	&lt;li&gt;Alters the MirroringSampler to sample in bursts&lt;/li&gt;
	&lt;li&gt;Adjusts the MirrorMaestro to make use of the changed MirroringSampler&lt;/li&gt;
	&lt;li&gt;Disables update command mirroring temporarily&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8c0293225af97f60131db8754f89be24cfd42174&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8c0293225af97f60131db8754f89be24cfd42174&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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            <issuekey id="1217263">SERVER-46578</issuekey>
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            <issuekey id="1217339">SERVER-46580</issuekey>
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