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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-7780] downgrading 2.3 to 2.0 causes local.oplog.rs Assertion failure len * 5 &gt; lastExtentSize</title>
                <link>https://jira.mongodb.org/browse/SERVER-7780</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At least with certain parameters (smallfiles, oplogsize : 40) restarting mongod 2.0 on data files created with mongod 2.3 can cause errors failures.  &lt;/p&gt;

&lt;p&gt;Discovered when running multi-version upgrade tests.&lt;/p&gt;</description>
                <environment></environment>
        <key id="57712">SERVER-7780</key>
            <summary>downgrading 2.3 to 2.0 causes local.oplog.rs Assertion failure len * 5 &gt; lastExtentSize</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="benjamin.becker">Ben Becker</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 27 Nov 2012 23:13:04 +0000</created>
                <updated>Wed, 14 Oct 2015 15:45:12 +0000</updated>
                            <resolved>Mon, 17 Dec 2012 16:38:07 +0000</resolved>
                                                    <fixVersion>2.3.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="206554" author="benjamin.becker" created="Tue, 4 Dec 2012 21:56:09 +0000"  >&lt;p&gt;To clarify, the issue is choosing the maximum bound on the number of documents in a capped collection.  To maintain backwards compatibility, we need to select a value to represent &apos;no max&apos; (or as close as possible) in all versions of mongod.  Because an on-disk format change is not possible at this time, the &apos;no max&apos; value was decided to be 2^31 (2147483647) documents.&lt;/p&gt;

&lt;p&gt;The caveat to this approach is that any collection with a max doc size of exactly 2147483647 documents will be treated as &apos;no max&apos; in v2.3.2+.  It should be noted that attempting to set the maximum number of documents on a capped collection to anything &amp;gt;= 2147483647 will result in no cap on the number of documents.&lt;/p&gt;</comment>
                            <comment id="206543" author="auto" created="Tue, 4 Dec 2012 21:47:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-04T21:46:51Z&apos;, u&apos;name&apos;: u&apos;Ben Becker&apos;, u&apos;email&apos;: u&apos;ben.becker@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7780&quot; title=&quot;downgrading 2.3 to 2.0 causes local.oplog.rs Assertion failure len * 5 &amp;gt; lastExtentSize&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7780&quot;&gt;&lt;del&gt;SERVER-7780&lt;/del&gt;&lt;/a&gt;: add test for explicit max doc count&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ed810cab19d462ae99c07c40ee976fd680435245&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ed810cab19d462ae99c07c40ee976fd680435245&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="206429" author="auto" created="Tue, 4 Dec 2012 19:59:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-04T19:59:39Z&apos;, u&apos;email&apos;: u&apos;ben.becker@10gen.com&apos;, u&apos;name&apos;: u&apos;Ben Becker&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7780&quot; title=&quot;downgrading 2.3 to 2.0 causes local.oplog.rs Assertion failure len * 5 &amp;gt; lastExtentSize&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7780&quot;&gt;&lt;del&gt;SERVER-7780&lt;/del&gt;&lt;/a&gt;: fix backwards compatability for max docs in capped collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/62cf5ad3e3b2e2c52f55f9b06e4d094047307923&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/62cf5ad3e3b2e2c52f55f9b06e4d094047307923&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="57775">DOCS-817</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="32711">SERVER-5285</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                <attachments>
                            <attachment id="22004" name="multi_cluster.js" size="4120" author="greg_10gen" created="Tue, 27 Nov 2012 23:13:04 +0000"/>
                            <attachment id="22005" name="multi_rs.js" size="2480" author="greg_10gen" created="Tue, 27 Nov 2012 23:13:04 +0000"/>
                            <attachment id="22002" name="test_failure_filtered.txt" size="164505" author="greg_10gen" created="Tue, 27 Nov 2012 23:13:04 +0000"/>
                            <attachment id="22003" name="upgrade_config_db.js" size="6353" author="greg_10gen" created="Tue, 27 Nov 2012 23:13:04 +0000"/>
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