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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-55391] Command with snapshot read concern without &apos;atClusterTime&apos; can fail with SnapshotTooOld</title>
                <link>https://jira.mongodb.org/browse/SERVER-55391</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In snapshot read concern, when the client does not specify an &apos;atClusterTime&apos;, the server will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/106428d4d952fdb6ae34ac1a2bf5e68e2afb31f0/src/mongo/db/read_concern_mongod.cpp#L401&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;chose one in the command entry point&lt;/a&gt; to be the CurrentCommittedSnapshotOpTime. However, when the command gets executed, the currentCommitedSnapshotOpTime in the node could already have been advanced beyond the minSnapshotHistoryWindowInSeconds, so the command would fail to open the cursor and return SnapshotTooOld. This is because the selection of the opTime to read and the opening of the cursor does not happen atomically.&lt;br/&gt;
The client can retry on that error, but it seems that this situation can potentially keep happening on retries. Thus the client can&apos;t deterministically get that query to eventually succeed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1655165">SERVER-55391</key>
            <summary>Command with snapshot read concern without &apos;atClusterTime&apos; can fail with SnapshotTooOld</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="13202">Works as Designed</resolution>
                                        <assignee username="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Mar 2021 11:27:29 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:28 +0000</updated>
                            <resolved>Tue, 30 Mar 2021 14:45:03 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3691285" author="lingzhi.deng" created="Tue, 30 Mar 2021 14:45:03 +0000"  >&lt;p&gt;Closing as &quot;Works as Designed&quot;. Sharding might need to consider having a larger snapshot window on configsvr for catalog cache refreshes (which will also depends on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47855&quot; title=&quot;Change default value for minSnapshotHistoryWindowInSeconds to 5 minutes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47855&quot;&gt;&lt;del&gt;SERVER-47855&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;</comment>
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