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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-41560] MongoDB should default the snapshot window size to 0 when running with the WT inMemory storage engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-41560</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The WT inMemory storage engine does not need to maintain snapshot history nor does it have a metric which MongoDB can use to gauge cache pressure and control the snapshot history window size. The window size should be kept at 0 for v4.2. inMemory members of a replica set cannot actually run transactions in v4.2, though they can replicate them.&lt;/p&gt;

&lt;p&gt;Voting inMemory replica set members require the replica set config to set the writeConcernMajorityJournalDefault to false. Replica sets with such configuration are not currently allowed to run replica set / shared transactions.&lt;/p&gt;

&lt;p&gt;An inMemory replica set with writeConcernMajorityJournalDefault set to true must be non-voting. Therefore, such a member cannot be primary. Transactions are only run against primary replica set members. So again, the inMemory node cannot directly run transactions, only replicate them as a secondary.&lt;/p&gt;

&lt;p&gt;There is no need for inMemory nodes to maintain snapshot history.&lt;/p&gt;</description>
                <environment></environment>
        <key id="791232">SERVER-41560</key>
            <summary>MongoDB should default the snapshot window size to 0 when running with the WT inMemory storage engine</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Jun 2019 13:20:05 +0000</created>
                <updated>Sun, 29 Oct 2023 22:20:16 +0000</updated>
                            <resolved>Tue, 2 Jul 2019 01:37:30 +0000</resolved>
                                                    <fixVersion>4.2.0-rc3</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2317574" author="xgen-internal-githook" created="Tue, 9 Jul 2019 18:10:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41560&quot; title=&quot;MongoDB should default the snapshot window size to 0 when running with the WT inMemory storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41560&quot;&gt;&lt;del&gt;SERVER-41560&lt;/del&gt;&lt;/a&gt; default the snapshot window size to 0 when running with the WT inMemory storage engine&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 164e785735f0fd8db2e0c68b86c2278ddc92a671)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/62eb326eb1f2fc7ee874af28b0f5e4aca462d988&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/62eb326eb1f2fc7ee874af28b0f5e4aca462d988&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2307792" author="xgen-internal-githook" created="Tue, 2 Jul 2019 01:37:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41560&quot; title=&quot;MongoDB should default the snapshot window size to 0 when running with the WT inMemory storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41560&quot;&gt;&lt;del&gt;SERVER-41560&lt;/del&gt;&lt;/a&gt; default the snapshot window size to 0 when running with the WT inMemory storage engine&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/164e785735f0fd8db2e0c68b86c2278ddc92a671&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/164e785735f0fd8db2e0c68b86c2278ddc92a671&lt;/a&gt;&lt;/p&gt;</comment>
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