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    <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>[DOCS-1708] Documentation isn&apos;t clear on what a &apos;blocking index build&apos; is</title>
                <link>https://jira.mongodb.org/browse/DOCS-1708</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The documentation correctly states that a foreground index build is a blocking operation.  However, it does not explain what this means.&lt;/p&gt;

&lt;p&gt;When a foreground index build is occurring on a particular collection in a particular database, it holds a write lock for that database for the entire duration of the index build, and does not release it until the index build is complete.  This means that while the index build is ongoing:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;You cannot access (read, insert, update, delete) any documents in any collection in the same database as the index build&lt;/li&gt;
	&lt;li&gt;You cannot perform any operation that requires a read or write lock on all databases ( &quot;listDatabases&quot; comes to mind, but there are probably others ).&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If and when collection-level locking gets implemented, this will change.&lt;/p&gt;</description>
                <environment>&lt;a href=&quot;http://docs.mongodb.org/manual/core/indexes/#background-construction&quot;&gt;http://docs.mongodb.org/manual/core/indexes/#background-construction&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/build-indexes-in-the-background/#build-indexes-in-the-background&quot;&gt;http://docs.mongodb.org/manual/tutorial/build-indexes-in-the-background/#build-indexes-in-the-background&lt;/a&gt;</environment>
        <key id="82349">DOCS-1708</key>
            <summary>Documentation isn&apos;t clear on what a &apos;blocking index build&apos; is</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="9">Done</resolution>
                                        <assignee username="zack.brown@10gen.com">Zack Brown</assignee>
                                    <reporter username="william.zola@10gen.com">William Zola</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Jul 2013 20:42:26 +0000</created>
                <updated>Mon, 19 Aug 2013 20:47:22 +0000</updated>
                            <resolved>Thu, 15 Aug 2013 19:46:07 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="406696" author="auto" created="Mon, 19 Aug 2013 20:45:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1708&quot; title=&quot;Documentation isn&amp;#39;t clear on what a &amp;#39;blocking index build&amp;#39; is&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1708&quot;&gt;&lt;del&gt;DOCS-1708&lt;/del&gt;&lt;/a&gt;: edits background indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a5d059070ef4f824563eaad429c5d193a3e18e66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a5d059070ef4f824563eaad429c5d193a3e18e66&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="406695" author="auto" created="Mon, 19 Aug 2013 20:45:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;Zackrobat&apos;, u&apos;name&apos;: u&apos;Zack Brown&apos;, u&apos;email&apos;: u&apos;zack.brown@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1708&quot; title=&quot;Documentation isn&amp;#39;t clear on what a &amp;#39;blocking index build&amp;#39; is&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1708&quot;&gt;&lt;del&gt;DOCS-1708&lt;/del&gt;&lt;/a&gt;: Documentation isn&apos;t clear on what a &apos;blocking index build&apos; is&lt;/p&gt;

&lt;p&gt;Signed-off-by: Sam Kleinman &amp;lt;samk@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ee296f516eaed93357851b406d5a934cf500797b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ee296f516eaed93357851b406d5a934cf500797b&lt;/a&gt;&lt;/p&gt;</comment>
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