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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-29197] Dangling index records when initial syncing node clones a capped collection that deletes records during collection scan</title>
                <link>https://jira.mongodb.org/browse/SERVER-29197</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During an initial sync of a capped collection, the collection scan reads until it hits EOF.  If records are inserted on the sync source during the collection scan, the scan may read more documents than the collection cap allows, which will result in records being deleted during the collection scan.&lt;br/&gt;
The collection cloner for initial sync uses a MultiIndexBlock builder, which does not expect records to be deleted while it builds indexes.  If records are deleted before the MultiIndexBlock commits at the end of the collection scan, it can leave dangling index records pointing to deleted records.  On WiredTiger, this simply results in an error when the index records are scanned.  On MMAPv1, the index records point to invalid record data, which may or may not produce a BSON parsing error that looks like this:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2017-05-15T09:45:48.697-0400 I -        [conn3] Assertion: 10334:BSONObj size: -286331154 (0xEEEEEEEE) is invalid. Size must be between 0 and 16793600(16MB) First element: _id: ObjectId(&apos;5919b0b5f337b48af7a0be4d&apos;) src/mongo/bson/bsonobj.cpp 58&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The collections in question will fail an index validation by the validate command.  To repair this issue, run the reindex command.&lt;/p&gt;</description>
                <environment></environment>
        <key id="383517">SERVER-29197</key>
            <summary>Dangling index records when initial syncing node clones a capped collection that deletes records during collection scan</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="13201">Fixed</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 May 2017 13:56:20 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:50 +0000</updated>
                            <resolved>Wed, 31 May 2017 19:24:46 +0000</resolved>
                                    <version>3.4.0</version>
                    <version>3.4.1</version>
                    <version>3.4.2</version>
                    <version>3.4.3</version>
                    <version>3.4.4</version>
                                    <fixVersion>3.4.6</fixVersion>
                    <fixVersion>3.5.9</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1596492" author="xgen-internal-githook" created="Wed, 14 Jun 2017 13:07:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29197&quot; title=&quot;Dangling index records when initial syncing node clones a capped collection that deletes records during collection scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29197&quot;&gt;&lt;del&gt;SERVER-29197&lt;/del&gt;&lt;/a&gt; initial sync now builds capped indexes correctly&lt;/p&gt;

&lt;p&gt;In initial sync, capped indexes were built along with regular indexes, as documents were inserted, using the MultiIndexBlock.&lt;br/&gt;
This structure requires that no records are deleted before committing the index builds.  But the collection cap might delete records prior to commit.&lt;br/&gt;
The new way to build capped indexes will be to create the indexes on a capped collection prior to inserting any records, for initial sync.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3a3a6def395bab81e7545b15a93bee7799d9efb1)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/34d292df70c97fadbac07296dea3cb04b6021a4d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/34d292df70c97fadbac07296dea3cb04b6021a4d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1584187" author="xgen-internal-githook" created="Wed, 31 May 2017 19:05:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29197&quot; title=&quot;Dangling index records when initial syncing node clones a capped collection that deletes records during collection scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29197&quot;&gt;&lt;del&gt;SERVER-29197&lt;/del&gt;&lt;/a&gt; initial sync now builds capped indexes correctly&lt;/p&gt;

&lt;p&gt;In initial sync, capped indexes were built along with regular indexes, as documents were inserted, using the MultiIndexBlock.&lt;br/&gt;
This structure requires that no records are deleted before committing the index builds.  But the collection cap might delete records prior to commit.&lt;br/&gt;
The new way to build capped indexes will be to create the indexes on a capped collection prior to inserting any records, for initial sync.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3a3a6def395bab81e7545b15a93bee7799d9efb1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3a3a6def395bab81e7545b15a93bee7799d9efb1&lt;/a&gt;&lt;/p&gt;</comment>
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