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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>[DOCS-474] Documentation on concurrency doesn&apos;t include information on concurrency in r2.2</title>
                <link>https://jira.mongodb.org/browse/DOCS-474</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Documentation should cover concurrency and locking information for MongoDB 2.2.&lt;/p&gt;

&lt;p&gt;This should probably include a table indicating the lock level required for various operations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="49100">DOCS-474</key>
            <summary>Documentation on concurrency doesn&apos;t include information on concurrency in r2.2</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="william.zola@10gen.com">William Zola</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Aug 2012 23:33:29 +0000</created>
                <updated>Mon, 10 Dec 2012 16:01:35 +0000</updated>
                            <resolved>Sat, 8 Dec 2012 20:14:37 +0000</resolved>
                                                                        <due></due>
                            <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="211119" author="auto" created="Mon, 10 Dec 2012 16:01:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-08T20:12:07Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-474&quot; title=&quot;Documentation on concurrency doesn&amp;#39;t include information on concurrency in r2.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-474&quot;&gt;&lt;del&gt;DOCS-474&lt;/del&gt;&lt;/a&gt; adding version changed notes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/398c7bd1e0e30841ffa10c2563f7f95874817a50&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/398c7bd1e0e30841ffa10c2563f7f95874817a50&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="209917" author="samk" created="Sat, 8 Dec 2012 20:13:59 +0000"  >&lt;p&gt;added a couple of version changed notes. The manual explicitly documents 2.2.x+, and will note when things were introduced in 2.x (and in some cases 2.0, for some behaviors) but to provide consistency, will not (and should not) document previous behavior to prevent confusion and abstruse information presentation... &lt;/p&gt;</comment>
                            <comment id="209093" author="william.zola@10gen.com" created="Fri, 7 Dec 2012 17:14:40 +0000"  >&lt;p&gt;I note that both these sections have paragraphs marked &apos;changed in version 2.2&apos;:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/faq/concurrency/#what-type-of-locking-does-mongodb-use&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/concurrency/#what-type-of-locking-does-mongodb-use&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/faq/concurrency/#does-a-read-or-write-ever-yield-the-lock&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/concurrency/#does-a-read-or-write-ever-yield-the-lock&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Since folks will be using 2.0 for some time to come, I think that these are a good idea.  I don&apos;t see why this shouldn&apos;t apply to the section on replication as well.&lt;/p&gt;</comment>
                            <comment id="209087" author="scotthernandez" created="Fri, 7 Dec 2012 17:04:08 +0000"  >&lt;p&gt;The manual is versioned at the current version (2.2+) and we are not writing versions for old releases.&lt;/p&gt;</comment>
                            <comment id="209084" author="william.zola@10gen.com" created="Fri, 7 Dec 2012 16:58:28 +0000"  >&lt;p&gt;Information in the last section ( &lt;a href=&quot;http://docs.mongodb.org/manual/faq/concurrency/#how-does-concurrency-affect-secondaries&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/concurrency/#how-does-concurrency-affect-secondaries&lt;/a&gt;) is correct for version 2.2, but not correct for version 2.0.&lt;/p&gt;

&lt;p&gt;In version 2.0, operations are read individually off the oplog and applied serially to the secondary.&lt;/p&gt;</comment>
                            <comment id="209060" author="samk" created="Fri, 7 Dec 2012 16:29:33 +0000"  >&lt;p&gt;new page: &lt;a href=&quot;http://docs.mongodb.org/manual/faq/concurrency/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/concurrency/&lt;/a&gt;&lt;/p&gt;</comment>
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