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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-5141] can you document more behavior for read isolation</title>
                <link>https://jira.mongodb.org/browse/DOCS-5141</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Cursor/transaction isolation is more interesting now that we have mmapv1, WiredTiger and RocksDB. Some doc updates have been done:&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4681&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/DOCS-4681&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2908&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/DOCS-2908&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Can we also update the docs to state that WiredTiger uses a snapshot per network call for queries as Dan mentions here?&lt;br/&gt;
&lt;a href=&quot;https://groups.google.com/forum/#!topic/mongodb-dev/XXk-OsujsKw&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!topic/mongodb-dev/XXk-OsujsKw&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="193152">DOCS-5141</key>
            <summary>can you document more behavior for read isolation</summary>
                <type id="5" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14716&amp;avatarType=issuetype">Sub-task</type>
                            <parent id="185670">DOCS-4856</parent>
                                    <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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="mdcallag">Mark Callaghan</reporter>
                        <labels>
                            <label>pull-request</label>
                    </labels>
                <created>Tue, 31 Mar 2015 16:15:45 +0000</created>
                <updated>Wed, 11 Jan 2017 22:35:39 +0000</updated>
                            <resolved>Thu, 21 May 2015 00:04:58 +0000</resolved>
                                                    <fixVersion>01112017-cleanup</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="919918" author="xgen-internal-githook" created="Thu, 21 May 2015 00:03:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5141&quot; title=&quot;can you document more behavior for read isolation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5141&quot;&gt;&lt;del&gt;DOCS-5141&lt;/del&gt;&lt;/a&gt; clean up documentation of isolation guarantees&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/aecfb5918c342f7f744f324e1130d6ea5be9eba8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/aecfb5918c342f7f744f324e1130d6ea5be9eba8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="919917" author="xgen-internal-githook" created="Thu, 21 May 2015 00:03:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5141&quot; title=&quot;can you document more behavior for read isolation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5141&quot;&gt;&lt;del&gt;DOCS-5141&lt;/del&gt;&lt;/a&gt; clean up documentation of isolation guarantees&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0e81c4fcb8b140fa84aeca510c491ea005c5ecc7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0e81c4fcb8b140fa84aeca510c491ea005c5ecc7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="872614" author="dan@10gen.com" created="Fri, 3 Apr 2015 20:36:31 +0000"  >&lt;p&gt;Hi Mark,&lt;br/&gt;
Sorry about the confusion, at the time I made that statement (on Dec. 4th) it was true that WT used a snapshot per network roundtrip.  We had to later introduce yielding within each roundtrip late that month.  We will update the &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;Concurrency FAQ&lt;/a&gt; to make it a bit more clear and add some more examples, but in essence, both MMAP and WT provide the same read isolation guarantees in 3.0.  &lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="199572">DOCS-5259</issuekey>
        </issuelink>
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