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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-39169] Add testing-only support for doing snapshot reads outside of a transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-39169</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Testing-only support for running transactions that only do reads on secondaries is going away with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39139&quot; title=&quot;Remove testing support for secondary transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39139&quot;&gt;&lt;del&gt;SERVER-39139&lt;/del&gt;&lt;/a&gt; and the &lt;tt&gt;CheckReplDBHashInBackground&lt;/tt&gt; hook is being disabled along with it. We&apos;d like to retain the ability to detect transient data inconsistency failures (e.g. related to timestamping differences between the primary and secondary of a replica set) that have been resolved by the time we&apos;ve finished waiting for all operations to have replicated.&lt;/p&gt;

&lt;p&gt;A testing-only query option should be introduced to call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.7/src/mongo/db/storage/recovery_unit.h#L281-L329&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;RecoveryUnit::setTimestampReadSource()&lt;/tt&gt;&lt;/a&gt; with a supplied &lt;tt&gt;clusterTime&lt;/tt&gt; to the &lt;tt&gt;find&lt;/tt&gt; and &lt;tt&gt;dbHash&lt;/tt&gt; commands. The &lt;tt&gt;run_check_repl_dbhash_background.js&lt;/tt&gt; hook should be update to use this new option for getting the dbhash of a particular snapshot and computing the diff between replica set members should a mismatch arise.&lt;/p&gt;

&lt;p&gt;Some care will need to be taken to handle (e.g. by retrying) the cursor getting killed as a result the collection or an index on the collection being dropped when attempting to compute the diff.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="677165">SERVER-39169</key>
            <summary>Add testing-only support for doing snapshot reads outside of a transaction</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>tig-dataconsistency</label>
                    </labels>
                <created>Thu, 24 Jan 2019 04:49:03 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:50 +0000</updated>
                            <resolved>Mon, 11 Feb 2019 20:44:18 +0000</resolved>
                                                    <fixVersion>4.1.8</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2145076" author="xgen-internal-githook" created="Mon, 11 Feb 2019 20:43:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39169&quot; title=&quot;Add testing-only support for doing snapshot reads outside of a transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39169&quot;&gt;&lt;del&gt;SERVER-39169&lt;/del&gt;&lt;/a&gt; Add $_internalReadAtClusterTime option to find and dbHash.&lt;/p&gt;

&lt;p&gt;The new $_internalReadAtClusterTime option replaces all usages of&lt;br/&gt;
running the dbHash command inside of a multi-statement transaction. It&lt;br/&gt;
can be used to read from a consistent snapshot in place of specifying an&lt;br/&gt;
atClusterTime read concern.&lt;/p&gt;

&lt;p&gt;Unlike multi-statement transactions, the new $_internalReadAtClusterTime&lt;br/&gt;
option doesn&apos;t cause locks to be left on the server after returning a&lt;br/&gt;
network response. It instead restores the snapshot to read from as part&lt;br/&gt;
of handling the request.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9db1a8dffe753808bea0d8c47d9fc959eaea9ea0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9db1a8dffe753808bea0d8c47d9fc959eaea9ea0&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="683624">SERVER-39372</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="681289">SERVER-39321</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="1637460">SERVER-54899</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="736553">SERVER-40589</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="689008">SERVER-39565</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="700218">SERVER-39660</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="537576">SERVER-34778</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="537577">SERVER-34779</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="676205">SERVER-39139</issuekey>
        </issuelink>
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                                    </issuelinktype>
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