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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-33639] Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time</title>
                <link>https://jira.mongodb.org/browse/SERVER-33639</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Starting with MongoDB 3.6.0, the creation of sharded databases was made explicit from the point of view of MongoS and the creation logic was moved to the config server. Since the default distributed lock acquisition timeout is still 20 seconds, this causes timeouts when large number of threads suddenly try to write against a database, which does not exist.&lt;/p&gt;

&lt;p&gt;What happens is a convoying effect on the &lt;tt&gt;-movePrimary&lt;/tt&gt; distributed lock, which times out and fails writes even though the database is already created. I am able to reproduce this problem 100% using the load phase of the YCSB benchmark with 40 threads.&lt;/p&gt;

&lt;p&gt;In order to avoid this effect, before taking the distributed lock, we should take some form of lock manager X lock, like with the other metadata commands after which we should check the database for existence before taking the distributed lock, in order to mitigate the convoying effect.&lt;/p&gt;</description>
                <environment></environment>
        <key id="504973">SERVER-33639</key>
            <summary>Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time</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="13201">Fixed</resolution>
                                        <assignee username="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Mar 2018 21:57:23 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:11 +0000</updated>
                            <resolved>Wed, 23 May 2018 14:34:09 +0000</resolved>
                                    <version>3.6.3</version>
                    <version>3.7.2</version>
                                    <fixVersion>3.6.6</fixVersion>
                    <fixVersion>4.0.0-rc1</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1901891" author="xgen-internal-githook" created="Fri, 25 May 2018 15:48:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jannaerin&apos;, &apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33639&quot; title=&quot;Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33639&quot;&gt;&lt;del&gt;SERVER-33639&lt;/del&gt;&lt;/a&gt; Protect against distlock acquisition timeout at createDatabase time&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c1cc37fa0958963427000ec1ac2368efe2ea8177)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1a58ef4331ead1add54710e5c9a1f5b117706c2f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1a58ef4331ead1add54710e5c9a1f5b117706c2f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1901884" author="xgen-internal-githook" created="Fri, 25 May 2018 15:45:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jannaerin&apos;, &apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33639&quot; title=&quot;Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33639&quot;&gt;&lt;del&gt;SERVER-33639&lt;/del&gt;&lt;/a&gt; Protect against distlock acquisition timeout at createDatabase time&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c1cc37fa0958963427000ec1ac2368efe2ea8177)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1d296f2e5bf33274e52be0b0bbb823e07ad6b8dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1d296f2e5bf33274e52be0b0bbb823e07ad6b8dd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1901878" author="xgen-internal-githook" created="Fri, 25 May 2018 15:41:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jannaerin&apos;, &apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33639&quot; title=&quot;Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33639&quot;&gt;&lt;del&gt;SERVER-33639&lt;/del&gt;&lt;/a&gt; Protect against distlock acquisition timeout at createDatabase time&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c1cc37fa0958963427000ec1ac2368efe2ea8177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c1cc37fa0958963427000ec1ac2368efe2ea8177&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1899963" author="xgen-internal-githook" created="Wed, 23 May 2018 19:33:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jannaerin&apos;, &apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33639&quot; title=&quot;Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33639&quot;&gt;&lt;del&gt;SERVER-33639&lt;/del&gt;&lt;/a&gt; Protect against distlock acquisition timeout at createDatabase time&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c8497a2c85e65680b439603caba6874b54082355&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c8497a2c85e65680b439603caba6874b54082355&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1899507" author="xgen-internal-githook" created="Wed, 23 May 2018 14:31:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jannaerin&apos;, &apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33639&quot; title=&quot;Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33639&quot;&gt;&lt;del&gt;SERVER-33639&lt;/del&gt;&lt;/a&gt; Protect against distlock acquisition timeout at createDatabase time&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8ba9e8eb48d948c082ff5cb85dc059322f5ea5cb)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fea3de5fb3fff05c2051e6c8ac8d04d5359b922b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fea3de5fb3fff05c2051e6c8ac8d04d5359b922b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1899476" author="janna.golden" created="Wed, 23 May 2018 14:16:39 +0000"  >&lt;p&gt;A different ticket was committed with this ticket number, removed that commit comment from this ticket.&lt;/p&gt;</comment>
                            <comment id="1899451" author="xgen-internal-githook" created="Wed, 23 May 2018 14:00:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jannaerin&apos;, &apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33639&quot; title=&quot;Concurrent writes against non-existent database can fail due to distlock acquisition timeout at `createDatabase` time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33639&quot;&gt;&lt;del&gt;SERVER-33639&lt;/del&gt;&lt;/a&gt; Protect against distlock acquisition timeout at createDatabase time&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8ba9e8eb48d948c082ff5cb85dc059322f5ea5cb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8ba9e8eb48d948c082ff5cb85dc059322f5ea5cb&lt;/a&gt;&lt;/p&gt;</comment>
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