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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-39593] Persist sizeStorer information before opening up backup cursor</title>
                <link>https://jira.mongodb.org/browse/SERVER-39593</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On normal clean shutdown, sizeStorer information will be &lt;a href=&quot;https://github.com/mongodb/mongo/blob/34a1ce6a681e2637d3c29a49a9412efe63821178/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L780&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;persisted on disk&lt;/a&gt;. Therefore, the sizeStorer information will be accurate on restart. However, we didn&apos;t do that before opening up a backup cursor, so the sizeStorer information may be completely outdated.&#160;&lt;/p&gt;

&lt;p&gt;Even if we persist the sizeStorer information &lt;b&gt;right before&lt;/b&gt;&#160;opening up backup cursor, there is still a window when more writes could go to disk (in the form of journal) and the sizeStorer information is outdated. So this improvement can only make the sizeStorer information more accurate but cannot guarantee 100% accurate unless we can stop writes in that window.&lt;/p&gt;</description>
                <environment></environment>
        <key id="697982">SERVER-39593</key>
            <summary>Persist sizeStorer information before opening up backup cursor</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="xiangyu.yao@mongodb.com">Xiangyu Yao</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Feb 2019 23:40:10 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:59 +0000</updated>
                            <resolved>Mon, 1 Apr 2019 12:08:03 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2199100" author="xgen-internal-githook" created="Tue, 2 Apr 2019 14:31:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39593&quot; title=&quot;Persist sizeStorer information before opening up backup cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39593&quot;&gt;&lt;del&gt;SERVER-39593&lt;/del&gt;&lt;/a&gt; Add requires_persistence flag&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/dd2d3d8f5bdacfe56b096ecc20a3d831d1001b40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/dd2d3d8f5bdacfe56b096ecc20a3d831d1001b40&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2197481" author="xgen-internal-githook" created="Mon, 1 Apr 2019 12:07:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39593&quot; title=&quot;Persist sizeStorer information before opening up backup cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39593&quot;&gt;&lt;del&gt;SERVER-39593&lt;/del&gt;&lt;/a&gt; Persist sizeStorer information before opening the backup cursor&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/3d52a91b5692954999bf2138677535a57d0da3f2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/3d52a91b5692954999bf2138677535a57d0da3f2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2197480" author="xgen-internal-githook" created="Mon, 1 Apr 2019 12:06:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39593&quot; title=&quot;Persist sizeStorer information before opening up backup cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39593&quot;&gt;&lt;del&gt;SERVER-39593&lt;/del&gt;&lt;/a&gt; Persist sizeStorer information before opening the backup cursor&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f6a54acac01be288dcf4ec1fc8df3cde92a6d36b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f6a54acac01be288dcf4ec1fc8df3cde92a6d36b&lt;/a&gt;&lt;/p&gt;</comment>
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