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    <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-37514] Snapshot readConcern without atClusterTime should always be speculative</title>
                <link>https://jira.mongodb.org/browse/SERVER-37514</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Read concern level snapshot executes speculatively if &lt;a href=&quot;https://github.com/mongodb/mongo/blob/352fd4700590fcb0adc1f356794bd4c4fa98befe/src/mongo/db/read_concern_mongod.cpp#L218-L219&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the command is&#160;run as part of a transaction and &lt;tt&gt;atClusterTime&lt;/tt&gt; is not provided&lt;/a&gt;. However, we allow read concern level snapshot &lt;a href=&quot;https://github.com/mongodb/mongo/blob/352fd4700590fcb0adc1f356794bd4c4fa98befe/src/mongo/db/service_entry_point_common.cpp#L784-L786&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if the command is run as part of an active &lt;b&gt;or killed&lt;/b&gt; transaction&lt;/a&gt;. This means that if the transaction has been killed, we will wait for read concern with non-speculative behavior. This behavior is not supported. When &lt;tt&gt;atClusterTime&lt;/tt&gt; is not specified, we always expect transactions to execute speculatively. One issue that could arise is that on mongods with &lt;tt&gt;enableMajorityReadConcern:&quot;false&quot;&lt;/tt&gt;, we will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/352fd4700590fcb0adc1f356794bd4c4fa98befe/src/mongo/db/read_concern_mongod.cpp#L328&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attempt to obtain a majority committed snapshot&lt;/a&gt;. This always returns a non-ok status, so we will loop forever waiting for majority reads to become available.&lt;/p&gt;

&lt;p&gt;Note that we expect this issue to be rare outside of tests. It only occurs when a &lt;tt&gt;readConcern&lt;/tt&gt; is specified on the operation, which a driver would only do if it is the first operation of the transaction. For a transaction to be killed on the first operation in a transaction, before the &lt;tt&gt;waitForReadConcern&lt;/tt&gt;, there would need to be a concurrent &lt;tt&gt;killSessions&lt;/tt&gt;. This issue is more likely to occur if there is a &lt;tt&gt;readConcern&lt;/tt&gt; on a subsequent transaction operation, which a driver would not do. In that case, the transaction could have been aborted earlier for any reason. We wait for read concern &lt;a href=&quot;https://github.com/mongodb/mongo/blob/352fd4700590fcb0adc1f356794bd4c4fa98befe/src/mongo/db/service_entry_point_common.cpp#L841&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; before we unstash resources &lt;a href=&quot;https://github.com/mongodb/mongo/blob/352fd4700590fcb0adc1f356794bd4c4fa98befe/src/mongo/db/service_entry_point_common.cpp#L394&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/352fd4700590fcb0adc1f356794bd4c4fa98befe/src/mongo/db/transaction_participant.cpp#L661-L663&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;throws if a read concern is provided and the transaction is in progress&lt;/a&gt;, so we do not catch the problem until we have already waited.&lt;/p&gt;</description>
                <environment></environment>
        <key id="615713">SERVER-37514</key>
            <summary>Snapshot readConcern without atClusterTime should always be speculative</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 Oct 2018 20:30:06 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:33 +0000</updated>
                            <resolved>Thu, 11 Oct 2018 14:25:58 +0000</resolved>
                                    <version>4.0.3</version>
                    <version>4.1.3</version>
                                    <fixVersion>4.0.4</fixVersion>
                    <fixVersion>4.1.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2030343" author="xgen-internal-githook" created="Thu, 11 Oct 2018 17:25:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37514&quot; title=&quot;Snapshot readConcern without atClusterTime should always be speculative&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37514&quot;&gt;&lt;del&gt;SERVER-37514&lt;/del&gt;&lt;/a&gt; Snapshot readConcern without atClusterTime should always be speculative&lt;/p&gt;

&lt;p&gt;(cherry picked from commit cc99b89e8c2ecbae3b4ae006f0a97927fe6040ce)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9059ddd51b864b35049f128eabaf8c89bd39d98e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9059ddd51b864b35049f128eabaf8c89bd39d98e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2030080" author="xgen-internal-githook" created="Thu, 11 Oct 2018 14:18:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37514&quot; title=&quot;Snapshot readConcern without atClusterTime should always be speculative&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37514&quot;&gt;&lt;del&gt;SERVER-37514&lt;/del&gt;&lt;/a&gt; Snapshot readConcern without atClusterTime should always be speculative&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cc99b89e8c2ecbae3b4ae006f0a97927fe6040ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cc99b89e8c2ecbae3b4ae006f0a97927fe6040ce&lt;/a&gt;&lt;/p&gt;</comment>
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