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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-20406] Replication code misunderstands which storage engine is being used in some circumstances</title>
                <link>https://jira.mongodb.org/browse/SERVER-20406</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e61e8a9cbd3c5c1e5a46fc74f4b5ab5ce879c115/src/mongo/db/db.cpp#L752-L757&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;code&lt;/a&gt; used at start up to inform the replication subsystem whether or not the storage engine supports read committed is incorrect. If the user has not specified a storage engine in the config file or at the command line, &lt;tt&gt;storageGlobalParams.engine&lt;/tt&gt; will be set to &lt;tt&gt;wiredTiger&lt;/tt&gt;, but in that scenario the &lt;em&gt;actual&lt;/em&gt; storage engine is chosen based on the contents of the &lt;tt&gt;--dbpath&lt;/tt&gt; directory. This scenario is detected by consulting the &lt;tt&gt;storageGlobalParams.engineSetByUser&lt;/tt&gt; predicate, but in this case there is no way to find out the actual type of the storage engine at this point in time.&lt;/p&gt;

&lt;p&gt;Unfortunately, the current implementation leads to bad behavior when configuring a replica set to act as a config server, because such sets should refuse to admit mmapv1 nodes as members.&lt;/p&gt;

&lt;p&gt;This problem is related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19739&quot; title=&quot;Support replica set config servers with any storage engine that supports majority read concern&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19739&quot;&gt;&lt;del&gt;SERVER-19739&lt;/del&gt;&lt;/a&gt;, and has the same challenge w.r.t. fixing it, as noted in the code comment linked above.&lt;/p&gt;</description>
                <environment></environment>
        <key id="229706">SERVER-20406</key>
            <summary>Replication code misunderstands which storage engine is being used in some circumstances</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="9">Done</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Sep 2015 23:13:32 +0000</created>
                <updated>Wed, 25 Jan 2017 22:00:05 +0000</updated>
                            <resolved>Thu, 15 Oct 2015 19:49:48 +0000</resolved>
                                                    <fixVersion>3.2.0-rc1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1062080" author="xgen-internal-githook" created="Thu, 15 Oct 2015 19:46:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20406&quot; title=&quot;Replication code misunderstands which storage engine is being used in some circumstances&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20406&quot;&gt;&lt;del&gt;SERVER-20406&lt;/del&gt;&lt;/a&gt; update topology coordinator settings for read committed support when starting replication&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6dc5f202409a94027190611af1f48a17a93ef318&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6dc5f202409a94027190611af1f48a17a93ef318&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1029972" author="milkie" created="Tue, 15 Sep 2015 13:18:38 +0000"  >&lt;p&gt;The condition for determining whether the storage engine supports read committed becomes known after startThreads() is called in the repl coord external state.  We could tell the topology coordinator at the same time.&lt;/p&gt;</comment>
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            <issuekey id="223956">SERVER-19739</issuekey>
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