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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>[DOCS-13090] Statement in production notes seems incorrect.</title>
                <link>https://jira.mongodb.org/browse/DOCS-13090</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;The statement &quot; WiredTiger storage engine may experience checkpoint hangs on systems with unreliable clocks.&quot; seems to have little supporting evidence among our engineers.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/v4.0/administration/production-notes/#clock-synchronization&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/v4.0/administration/production-notes/#clock-synchronization&lt;/a&gt;&lt;/p&gt;



&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="966394">DOCS-13090</key>
            <summary>Statement in production notes seems incorrect.</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="ravind.kumar">Ravind Kumar</assignee>
                                    <reporter username="john.page@mongodb.com">John Page</reporter>
                        <labels>
                            <label>docs-investigating</label>
                    </labels>
                <created>Thu, 10 Oct 2019 08:04:34 +0000</created>
                <updated>Mon, 30 Oct 2023 20:33:38 +0000</updated>
                            <resolved>Wed, 6 Nov 2019 21:06:32 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2521402" author="ravind.kumar" created="Wed, 6 Nov 2019 21:06:32 +0000"  >&lt;p&gt;Thanks for your patience. Publishing master -&amp;gt; 3.2 now with the updates.&lt;/p&gt;</comment>
                            <comment id="2521399" author="xgen-internal-githook" created="Wed, 6 Nov 2019 21:05:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ravind Kumar&apos;, &apos;email&apos;: &apos;ravind.kumar@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13090&quot; title=&quot;Statement in production notes seems incorrect.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13090&quot;&gt;&lt;del&gt;DOCS-13090&lt;/del&gt;&lt;/a&gt;: Revise outdated production notes guidance on clock sync&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c00f9fb9269b53f679733d46cc839a01d8310b9f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c00f9fb9269b53f679733d46cc839a01d8310b9f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2521397" author="xgen-internal-githook" created="Wed, 6 Nov 2019 21:05:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;ravind.kumar@mongodb.com&apos;, &apos;name&apos;: &apos;Ravind Kumar&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13090&quot; title=&quot;Statement in production notes seems incorrect.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13090&quot;&gt;&lt;del&gt;DOCS-13090&lt;/del&gt;&lt;/a&gt;: Revise outdated production notes guidance on clock sync&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/be53a124240f34b46a13263bb5b0b4384d1cedea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/be53a124240f34b46a13263bb5b0b4384d1cedea&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2521396" author="xgen-internal-githook" created="Wed, 6 Nov 2019 21:05:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ravind Kumar&apos;, &apos;email&apos;: &apos;ravind.kumar@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13090&quot; title=&quot;Statement in production notes seems incorrect.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13090&quot;&gt;&lt;del&gt;DOCS-13090&lt;/del&gt;&lt;/a&gt;: Revise outdated production notes guidance on clock sync&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/d5e5fd4c09fde6e9347d27d15a2ff73012da6449&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d5e5fd4c09fde6e9347d27d15a2ff73012da6449&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2521393" author="xgen-internal-githook" created="Wed, 6 Nov 2019 21:05:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ravind Kumar&apos;, &apos;email&apos;: &apos;ravind.kumar@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13090&quot; title=&quot;Statement in production notes seems incorrect.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13090&quot;&gt;&lt;del&gt;DOCS-13090&lt;/del&gt;&lt;/a&gt;: Revise outdated production notes guidance on clock sync&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/275323cc610772992bc5c87aac18dd5ab3b19970&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/275323cc610772992bc5c87aac18dd5ab3b19970&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2521247" author="xgen-internal-githook" created="Wed, 6 Nov 2019 20:19:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ravind Kumar&apos;, &apos;email&apos;: &apos;ravind.kumar@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13090&quot; title=&quot;Statement in production notes seems incorrect.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13090&quot;&gt;&lt;del&gt;DOCS-13090&lt;/del&gt;&lt;/a&gt;: Revise outdated production notes guidance on clock sync&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/cf621fe42d5b302938abfd9a4ceee52dae1a3171&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/cf621fe42d5b302938abfd9a4ceee52dae1a3171&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2478602" author="ravind.kumar" created="Fri, 11 Oct 2019 20:00:59 +0000"  >&lt;p&gt;I&apos;m checking w/ the server DS team to confirm whether the NTP clock is required for sharded transactions. cc &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; Based on that answer I&apos;ll move forward, as I may not be able to simply nuke the entire section as originally planned.&lt;/p&gt;</comment>
                            <comment id="2476116" author="ravind.kumar" created="Thu, 10 Oct 2019 17:39:08 +0000"  >&lt;p&gt;No worries, this seems a straightforward enough fix. I&apos;ll try to get to it before the end of the week. Thanks for raising it!&lt;/p&gt;</comment>
                            <comment id="2476089" author="john.page" created="Thu, 10 Oct 2019 17:26:24 +0000"  >&lt;p&gt;Was unaware of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29415&quot; title=&quot;Unable to start WiredTiger service due to corruption in WiredTiger.wt&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29415&quot;&gt;&lt;del&gt;WT-3347&lt;/del&gt;&lt;/a&gt;, as were others in MongoDB Tech Channel&lt;/p&gt;</comment>
                            <comment id="2476078" author="sue.loverso" created="Thu, 10 Oct 2019 17:22:57 +0000"  >&lt;blockquote&gt;&lt;p&gt;we can safely remove that graf in 3.6+, and perhaps generalize it for 3.2/3.4 to state that the problem is considered resolved in the latest point versions of those releases.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This seems very reasonable to me. The fix is in every latest point release now.&lt;/p&gt;</comment>
                            <comment id="2475705" author="ravind.kumar" created="Thu, 10 Oct 2019 14:33:08 +0000"  >&lt;p&gt;So from the original docs ticket, I see&lt;/p&gt;

&lt;p&gt;&amp;gt; We should warn users against using MongoDB &amp;lt;3.4.6 on a system with known clock issues.&lt;/p&gt;

&lt;p&gt;So maybe this warning only really applies to 3.4.5 and earlier?&lt;/p&gt;

&lt;p&gt;As noted in Kevin Arhelger&apos;s comment in #mongodb-tech:&lt;/p&gt;

&lt;p&gt;&amp;gt; Non-monotonic system clock is known to cause problems; related tickets include &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3327&quot; title=&quot;Checkpoints can hang if time runs backward&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3327&quot;&gt;&lt;del&gt;WT-3327&lt;/del&gt;&lt;/a&gt;, WT-&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29102&quot; title=&quot;WiredTiger does not rotate journal log files&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29102&quot;&gt;&lt;del&gt;SERVER-29102&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29230&quot; title=&quot;Journal files accumulating on ReplicaSet Secondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29230&quot;&gt;&lt;del&gt;SERVER-29230&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
 &amp;gt; Plus &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3461&quot; title=&quot;Avoid long sleeps when the system clock is adjusted&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3461&quot;&gt;&lt;del&gt;WT-3461&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We&apos;d probably want to confirm with someone from storage (perhaps &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sue.loverso&quot; class=&quot;user-hover&quot; rel=&quot;sue.loverso&quot;&gt;sue.loverso&lt;/a&gt; who worked on &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3327&quot; title=&quot;Checkpoints can hang if time runs backward&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3327&quot;&gt;&lt;del&gt;WT-3327&lt;/del&gt;&lt;/a&gt;?) that we can safely remove that graf in 3.6+, and perhaps generalize it for 3.2/3.4 to state that the problem is considered resolved in the latest point versions of those releases.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="406664">DOCS-10562</issuekey>
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