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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-31241] check compact behavior re: timestamps</title>
                <link>https://jira.mongodb.org/browse/SERVER-31241</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;compact may or may not erase timestamp data on WiredTiger; we should check the behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="432467">SERVER-31241</key>
            <summary>check compact behavior re: timestamps</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Sep 2017 17:51:52 +0000</created>
                <updated>Tue, 6 Dec 2022 03:51:17 +0000</updated>
                            <resolved>Fri, 29 Sep 2017 14:08:22 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1681871" author="milkie" created="Tue, 26 Sep 2017 13:52:38 +0000"  >&lt;p&gt;No examples, we were just worried that something in the MongoDB code might affect timestamps.  It&apos;s good to know nothing in the WiredTiger code will affect them.&lt;/p&gt;</comment>
                            <comment id="1681568" author="alexander.gorrod" created="Tue, 26 Sep 2017 02:31:31 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; The way compact works in WiredTiger is that it creates new checkpoints in a file using a different block allocation algorithm, and then reclaims unused space at the end of a database file. Since checkpoints can only be created &quot;behind&quot; the stable timestamp the way WiredTiger implements compaction should not overlap with timestamp semantics.&lt;/p&gt;

&lt;p&gt;Have you seen an example where running compact alters the visibility of data?&lt;/p&gt;</comment>
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