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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-2744] Incorrect diskloc tracking when migrations exceed max BSON size</title>
                <link>https://jira.mongodb.org/browse/SERVER-2744</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When migrated BSON objects hit size limit, i.e.:&lt;/p&gt;

&lt;p&gt;a.len() + o.objsize() + 1024 &amp;gt; BSONObjMaxUserSize&lt;/p&gt;

&lt;p&gt;the iterator is decremented.  When this iterator is used to erase disk locations, as in:&lt;/p&gt;

&lt;p&gt;_cloneLocs.erase( _cloneLocs.begin() , i )&lt;/p&gt;

&lt;p&gt;the semantics is to erase from [beginning to end) (note open end of interval).  Therefore, the last disk loc returned will &lt;b&gt;not&lt;/b&gt; be removed from the list, and extra objects will be returned.  In the worst case when the objects are individually very large, the migration will send unlimited amounts of data since the disk locations will &lt;b&gt;never&lt;/b&gt; increment.  &lt;/p&gt;
</description>
                <environment></environment>
        <key id="15092">SERVER-2744</key>
            <summary>Incorrect diskloc tracking when migrations exceed max BSON size</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Mar 2011 21:10:25 +0000</created>
                <updated>Tue, 12 Jul 2016 00:19:29 +0000</updated>
                            <resolved>Fri, 11 Mar 2011 21:56:15 +0000</resolved>
                                                    <fixVersion>1.8.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="25797" author="auto" created="Fri, 11 Mar 2011 21:57:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: fix migrate with oversize docs &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2744&quot; title=&quot;Incorrect diskloc tracking when migrations exceed max BSON size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2744&quot;&gt;&lt;del&gt;SERVER-2744&lt;/del&gt;&lt;/a&gt; 180&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/742349b0184a97ec31f99b32551035f0b8ef0b83&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/742349b0184a97ec31f99b32551035f0b8ef0b83&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="25794" author="auto" created="Fri, 11 Mar 2011 21:52:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: test for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2744&quot; title=&quot;Incorrect diskloc tracking when migrations exceed max BSON size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2744&quot;&gt;&lt;del&gt;SERVER-2744&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/27c2d5f2a276b5bc90d4de703932d1c0885dabdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/27c2d5f2a276b5bc90d4de703932d1c0885dabdf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="25793" author="auto" created="Fri, 11 Mar 2011 21:52:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: fix migrate with oversize docs &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2744&quot; title=&quot;Incorrect diskloc tracking when migrations exceed max BSON size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2744&quot;&gt;&lt;del&gt;SERVER-2744&lt;/del&gt;&lt;/a&gt; 180&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3d6f23651f9df9974f02595d8f402f28f1fc361d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3d6f23651f9df9974f02595d8f402f28f1fc361d&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="11081" name="migrateBigger.js" size="1055" author="greg_10gen" created="Fri, 11 Mar 2011 21:13:26 +0000"/>
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