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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-29151] Does wiredtiger.truncate satisfy the snapshot-isolation sematics?</title>
                <link>https://jira.mongodb.org/browse/SERVER-29151</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In oplog cleaning,  mongo use session-&amp;gt;truncate to cleanup oldest oplogs.&lt;br/&gt;
Which may still be held by snapshot-manager&apos;s uncommitted_snapshots.&lt;br/&gt;
If session-&amp;gt;truncate does not satisfy snapshot-isolation, snapshot-manager&apos;s uncommitted_snapshots are not dropped but the data are deleted.&lt;br/&gt;
If session-&amp;gt;truncate does satisfy snapshot-isolation, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29150&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;link SERVER-29150&lt;/a&gt; should be a problem?&lt;/p&gt;</description>
                <environment></environment>
        <key id="382861">SERVER-29151</key>
            <summary>Does wiredtiger.truncate satisfy the snapshot-isolation sematics?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="-1">Unassigned</assignee>
                                    <reporter username="wolf_kdy">deyukong</reporter>
                        <labels>
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                <created>Fri, 12 May 2017 02:54:17 +0000</created>
                <updated>Fri, 12 May 2017 15:17:08 +0000</updated>
                            <resolved>Fri, 12 May 2017 13:57:20 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1569731" author="wolf_kdy" created="Fri, 12 May 2017 15:17:08 +0000"  >&lt;p&gt;OK, thanks. I will forward this question into the group.&lt;/p&gt;</comment>
                            <comment id="1569632" author="milkie" created="Fri, 12 May 2017 13:57:20 +0000"  >&lt;p&gt;Thanks for your report. Please note that SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-developer related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-dev&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-dev group&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-dev group.&lt;/p&gt;</comment>
                            <comment id="1569628" author="milkie" created="Fri, 12 May 2017 13:54:05 +0000"  >&lt;p&gt;WiredTiger&apos;s fast truncate() does support read isolation levels appropriately, including snapshot isolation.  As described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29150&quot; title=&quot;Oplog/Snapshot/Memory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29150&quot;&gt;&lt;del&gt;SERVER-29150&lt;/del&gt;&lt;/a&gt;, performance will suffer if the committed snapshot does not move but new writes continue to happen.&lt;/p&gt;</comment>
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