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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-55551] Remove drop index from create collection path</title>
                <link>https://jira.mongodb.org/browse/SERVER-55551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If we are creating a collection the following scenario might happen:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;We start sharding an empty collection with a hashed key index&lt;/li&gt;
	&lt;li&gt;There is a stepdown&lt;/li&gt;
	&lt;li&gt;A write sneaks in before resuming the coordinator&lt;/li&gt;
	&lt;li&gt;The new primary starts the phase two, but we cannot shard the collection with a hashed index that already has data so the shard collection fails&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In order to ensure there is no leftover data at command termination, a drop index was added to the create collection path that will be executed only if the index was not already on the collection and we are recovering from a step down, however, this might generate the following scenario:&lt;/p&gt;

&lt;p&gt;Imagine we have a 10TB collection and we try to shard the collection:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The request would block for 15 min in the critical section to create an index&lt;/li&gt;
	&lt;li&gt;The server is overwhelmed with parked network requests which block on the CS and crashes&lt;/li&gt;
	&lt;li&gt;The server comes back up and resumes shard collection, same thing happens over and over, because we drop the index and then recreate it again.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We must remove this drop index operation, in order to do so, we could, for example, use the same&#160;approach of resharding, by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55494&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;preventing writes on the collections on step up&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1660255">SERVER-55551</key>
            <summary>Remove drop index from create collection path</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                            <label>PM-1965-Milestone-1</label>
                    </labels>
                <created>Fri, 26 Mar 2021 12:24:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:55:43 +0000</updated>
                            <resolved>Mon, 19 Apr 2021 17:28:51 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3725567" author="xgen-internal-githook" created="Mon, 19 Apr 2021 17:02:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55551&quot; title=&quot;Remove drop index from create collection path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55551&quot;&gt;&lt;del&gt;SERVER-55551&lt;/del&gt;&lt;/a&gt; Add recoverable critical section in create collection path&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e14fe6935ef5b044deea74d0354356cc84f0fa6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e14fe6935ef5b044deea74d0354356cc84f0fa6&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1625532">SERVER-54587</issuekey>
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            <issuelink>
            <issuekey id="1657946">SERVER-55494</issuekey>
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            <issuekey id="1675894">SERVER-55969</issuekey>
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            <issuekey id="1691284">SERVER-56342</issuekey>
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