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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>
    </build-info>


<item>
            <title>[SERVER-43664] Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()</title>
                <link>https://jira.mongodb.org/browse/SERVER-43664</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25025&quot; title=&quot;Improve startup time when there are tens of thousands of collections/indexes on WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25025&quot;&gt;&lt;del&gt;SERVER-25025&lt;/del&gt;&lt;/a&gt; targets inefficiencies in startup initialization in MongoDB&apos;s use of WiredTiger.&lt;/p&gt;

&lt;p&gt;Even with these optimizations, given a large number of collections, we could still benefit from parallelizing the startup procedure. It is currently single-threaded and mostly CPU-bound, spending almost all CPU time-per-collection in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ef1ae393690ba84164994617add68f11cc12fa89/src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp#L574&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setTableLogging().&lt;/a&gt;&#160;This uses an expensive &quot;metadata:create&quot; cursor to determine whether or not a table is logged.&lt;/p&gt;</description>
                <environment></environment>
        <key id="942420">SERVER-43664</key>
            <summary>Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 Sep 2019 21:17:28 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:45 +0000</updated>
                            <resolved>Thu, 3 Sep 2020 02:52:01 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                    <fixVersion>4.2.11</fixVersion>
                                    <component>Storage</component>
                                        <votes>3</votes>
                                    <watches>23</watches>
                                                                                                                <comments>
                            <comment id="3464644" author="xgen-internal-githook" created="Tue, 27 Oct 2020 14:41:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43664&quot; title=&quot;Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43664&quot;&gt;&lt;del&gt;SERVER-43664&lt;/del&gt;&lt;/a&gt; Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8e64b07e3bb363347ee2c11a56aba873365ed74a)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3a55bbd37a050841bc2791b13489dd66c9bc7c67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3a55bbd37a050841bc2791b13489dd66c9bc7c67&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3439502" author="xgen-internal-githook" created="Mon, 12 Oct 2020 15:11:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43664&quot; title=&quot;Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43664&quot;&gt;&lt;del&gt;SERVER-43664&lt;/del&gt;&lt;/a&gt; Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 97fdfbefdc6841d0b07d0bf54a28c86c70ca5e19.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5454f3bf6391624e42efbc2538536cb0e8bdaab2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5454f3bf6391624e42efbc2538536cb0e8bdaab2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3424064" author="xgen-internal-githook" created="Sat, 3 Oct 2020 04:03:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43664&quot; title=&quot;Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43664&quot;&gt;&lt;del&gt;SERVER-43664&lt;/del&gt;&lt;/a&gt; Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8e64b07e3bb363347ee2c11a56aba873365ed74a)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/97fdfbefdc6841d0b07d0bf54a28c86c70ca5e19&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/97fdfbefdc6841d0b07d0bf54a28c86c70ca5e19&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3424026" author="xgen-internal-githook" created="Sat, 3 Oct 2020 00:27:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43664&quot; title=&quot;Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43664&quot;&gt;&lt;del&gt;SERVER-43664&lt;/del&gt;&lt;/a&gt; Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8e64b07e3bb363347ee2c11a56aba873365ed74a)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/66999d4a0c312052f2987f7f283155d468a995f5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/66999d4a0c312052f2987f7f283155d468a995f5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3377085" author="alexander.gorrod" created="Mon, 7 Sep 2020 06:54:05 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gregory.wlodarek&quot; class=&quot;user-hover&quot; rel=&quot;gregory.wlodarek&quot;&gt;gregory.wlodarek&lt;/a&gt; - that is a great improvement!&lt;/p&gt;</comment>
                            <comment id="3374970" author="xgen-internal-githook" created="Thu, 3 Sep 2020 15:57:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43664&quot; title=&quot;Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43664&quot;&gt;&lt;del&gt;SERVER-43664&lt;/del&gt;&lt;/a&gt; Fix file name lookup in wt_table_checks*.js for Windows&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4f430e6e495c139a2fa4511d18b35dbf6ccaca80&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4f430e6e495c139a2fa4511d18b35dbf6ccaca80&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3373719" author="xgen-internal-githook" created="Thu, 3 Sep 2020 02:26:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43664&quot; title=&quot;Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43664&quot;&gt;&lt;del&gt;SERVER-43664&lt;/del&gt;&lt;/a&gt; Speedup WiredTiger storage engine startup for many tables by optimizing WiredTigerUtil::setTableLogging()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8e64b07e3bb363347ee2c11a56aba873365ed74a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8e64b07e3bb363347ee2c11a56aba873365ed74a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3373545" author="gregory.wlodarek" created="Wed, 2 Sep 2020 23:30:11 +0000"  >&lt;p&gt;The change for this is now in the commit queue, so I thought I&apos;d follow up with a summary of the results.&lt;/p&gt;

&lt;p&gt;I ran some basic performance results on the time spent starting up and shutting down mongod averaged out over ten executions.&lt;/p&gt;

&lt;p&gt;On master:&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&amp;#35; Tables&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Time Spent&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.3013s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.5038s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.7056s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;10000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2.1347s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;20000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;3.2862s&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;On v4.4:&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&amp;#35; Tables&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Time Spent&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.8004s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.9329s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;3.4488s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;10000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5.0004s&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;20000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;8.7877s&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;Difference:&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&amp;#35; Tables&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Speedup&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.38x&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1.28x&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2.02x&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;10000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2.34x&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;20000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2.67x&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;
</comment>
                            <comment id="2704671" author="alexander.gorrod" created="Sun, 5 Jan 2020 21:17:42 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; that sounds like a good idea to me. If we make a change here I think we should also check to make sure that opening an old database with a new version gets a useful error message, and doesn&apos;t either try to proceed without updating the logging settings or (worse) corrupting the database. I remember that it was a bit of a journey to get to this solution with upgrade/downgrade considerations (I think &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37483&quot; title=&quot;Reintroduce live changes to table logging settings&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37483&quot;&gt;&lt;del&gt;SERVER-37483&lt;/del&gt;&lt;/a&gt; is the most recent relevant ticket to that).&lt;/p&gt;</comment>
                            <comment id="2691331" author="milkie" created="Mon, 30 Dec 2019 13:32:29 +0000"  >&lt;p&gt;After examining this behavior, I think we should work on removing the blanket check for table logging instead of trying to speed it up.  I believe we only need to go through all the tables when making an actual change to logging, and we can simply assume the logging is set correctly otherwise.   The logging setting changes when switching between replica set and standalone, and when starting a replica set member in standalone maintenance mode.&lt;/p&gt;</comment>
                    </comments>
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