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    <title>MongoDB Jira</title>
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    <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-24997] Ignore &quot;cannot index parallel arrays&quot; errors during initial sync because they are transient</title>
                <link>https://jira.mongodb.org/browse/SERVER-24997</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During initial sync, there is a race between when we create our indexes and when we insert documents with multiple arrays. Consider the following order of events (possible in find_dedup.js):&lt;/p&gt;

&lt;p&gt;1. Secondary starts fetching operations from primary for its oplog buffer&lt;br/&gt;
2. Primary creates a compound index on two fields a and b&lt;br/&gt;
3. Primary drops the collection&lt;br/&gt;
4. Primary inserts document &lt;/p&gt;
{a: [1,2,3], b: [4,5,6]}
&lt;p&gt;5. Secondary copies the collection, including document &lt;/p&gt;
{a: [1,2,3], b: [4,5,6]}
&lt;p&gt;, but not including the compound index on fields a and b.&lt;br/&gt;
6. Secondary starts to apply its oplog&lt;br/&gt;
7. Secondary creates a compound index on fields a and b&lt;br/&gt;
8. Secondary gets a &quot;cannot index parallel arrays&quot; error.&lt;/p&gt;

&lt;p&gt;Later on the secondary will drop this collection and reinsert &lt;/p&gt;
{a: [1,2,3], b: [4,5,6]}
&lt;p&gt; and get to a consistent state if it is allowed to continue.&lt;/p&gt;</description>
                <environment></environment>
        <key id="300154">SERVER-24997</key>
            <summary>Ignore &quot;cannot index parallel arrays&quot; errors during initial sync because they are transient</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Jul 2016 20:16:25 +0000</created>
                <updated>Tue, 19 Jul 2016 17:04:12 +0000</updated>
                            <resolved>Tue, 12 Jul 2016 18:35:09 +0000</resolved>
                                    <version>3.0.12</version>
                    <version>3.2.7</version>
                    <version>3.3.9</version>
                                    <fixVersion>3.3.10</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1321727" author="xgen-internal-githook" created="Tue, 12 Jul 2016 18:34:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;judahschvimer&apos;, u&apos;name&apos;: u&apos;Judah Schvimer&apos;, u&apos;email&apos;: u&apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24997&quot; title=&quot;Ignore &amp;quot;cannot index parallel arrays&amp;quot; errors during initial sync because they are transient&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24997&quot;&gt;&lt;del&gt;SERVER-24997&lt;/del&gt;&lt;/a&gt; Ignore CannotIndexParallelArrays errors during initial sync&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/72d7a5572ff5b83800bb0615380d0da497d60084&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/72d7a5572ff5b83800bb0615380d0da497d60084&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1321726" author="xgen-internal-githook" created="Tue, 12 Jul 2016 18:34:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;judahschvimer&apos;, u&apos;name&apos;: u&apos;Judah Schvimer&apos;, u&apos;email&apos;: u&apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24997&quot; title=&quot;Ignore &amp;quot;cannot index parallel arrays&amp;quot; errors during initial sync because they are transient&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24997&quot;&gt;&lt;del&gt;SERVER-24997&lt;/del&gt;&lt;/a&gt; create CannotIndexParallelArrays error code&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/560c91cdeb146c733a7434888d124d73505dc0c1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/560c91cdeb146c733a7434888d124d73505dc0c1&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="293508">SERVER-24538</issuekey>
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