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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-40165] generate wtimeout deadlines with the precise clock</title>
                <link>https://jira.mongodb.org/browse/SERVER-40165</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In ReplicationCoordinatorImpl::_awaitReplication_inlock, we generate our deadline for waiting on wtimeout with the fast clock.  Because we generate the deadline with the fast clock, but actually wait on it with the precise clock, it is possible for us to wtimeout early if there is significant drift between the precise and fast clocks.&lt;/p&gt;

&lt;p&gt;This is unlikely to happen very often in practice, but could happen if the thread responsible for pushing ahead the fast clock get&apos;s descheduled for a substantial period of time.  In that case, it is possible for the fast clock to drift multiple seconds behind the precise clock, and to immediately timeout in waitForConditionOrInterruptNoAssertUntil.&lt;/p&gt;</description>
                <environment></environment>
        <key id="717505">SERVER-40165</key>
            <summary>generate wtimeout deadlines with the precise clock</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Mar 2019 17:49:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:54 +0000</updated>
                            <resolved>Fri, 19 Apr 2019 17:56:41 +0000</resolved>
                                                    <fixVersion>3.4.21</fixVersion>
                    <fixVersion>3.6.13</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>1</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2219639" author="xgen-internal-githook" created="Fri, 19 Apr 2019 20:18:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Carey&apos;, &apos;username&apos;: &apos;hanumantmk&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40165&quot; title=&quot;generate wtimeout deadlines with the precise clock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40165&quot;&gt;&lt;del&gt;SERVER-40165&lt;/del&gt;&lt;/a&gt; set wtimeout deadlines with the precise clock&lt;/p&gt;

&lt;p&gt;In ReplicationCoordinatorImpl::_awaitReplication_inlock, we generate our&lt;br/&gt;
deadline for waiting on wtimeout with the fast clock. Because we&lt;br/&gt;
generate the deadline with the fast clock, but actually wait on it with&lt;br/&gt;
the precise clock, it is possible for us to wtimeout early if there is&lt;br/&gt;
significant drift between the precise and fast clocks.&lt;/p&gt;

&lt;p&gt;This is unlikely to happen very often in practice, but could happen if&lt;br/&gt;
the thread responsible for pushing ahead the fast clock get&apos;s&lt;br/&gt;
descheduled for a substantial period of time. In that case, it is&lt;br/&gt;
possible for the fast clock to drift multiple seconds behind the precise&lt;br/&gt;
clock, and to immediately timeout in&lt;br/&gt;
waitForConditionOrInterruptNoAssertUntil.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 46086585d49f2da53d46c3f121e9f8dc23b699a1)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c2da4180540e81ba591b858e14688d40f9455554&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c2da4180540e81ba591b858e14688d40f9455554&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2219432" author="xgen-internal-githook" created="Fri, 19 Apr 2019 17:56:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Carey&apos;, &apos;username&apos;: &apos;hanumantmk&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40165&quot; title=&quot;generate wtimeout deadlines with the precise clock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40165&quot;&gt;&lt;del&gt;SERVER-40165&lt;/del&gt;&lt;/a&gt; set wtimeout deadlines with the precise clock&lt;/p&gt;

&lt;p&gt;In ReplicationCoordinatorImpl::_awaitReplication_inlock, we generate our&lt;br/&gt;
deadline for waiting on wtimeout with the fast clock. Because we&lt;br/&gt;
generate the deadline with the fast clock, but actually wait on it with&lt;br/&gt;
the precise clock, it is possible for us to wtimeout early if there is&lt;br/&gt;
significant drift between the precise and fast clocks.&lt;/p&gt;

&lt;p&gt;This is unlikely to happen very often in practice, but could happen if&lt;br/&gt;
the thread responsible for pushing ahead the fast clock get&apos;s&lt;br/&gt;
descheduled for a substantial period of time. In that case, it is&lt;br/&gt;
possible for the fast clock to drift multiple seconds behind the precise&lt;br/&gt;
clock, and to immediately timeout in&lt;br/&gt;
waitForConditionOrInterruptNoAssertUntil.&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46086585d49f2da53d46c3f121e9f8dc23b699a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46086585d49f2da53d46c3f121e9f8dc23b699a1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2187745" author="jason.carey" created="Thu, 21 Mar 2019 18:02:36 +0000"  >&lt;p&gt;On reflection, after the changes in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40166&quot; title=&quot;Force BG clock now == Date_t::lastNow&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40166&quot;&gt;&lt;del&gt;SERVER-40166&lt;/del&gt;&lt;/a&gt;, I&apos;m going to avoid committing this on &amp;gt;3.6, preferring the more general change.&lt;/p&gt;

&lt;p&gt;But in the interest of resolving bugs on 3.4 and 3.6, I&apos;m still going to push forward with this change for those branches&lt;/p&gt;</comment>
                    </comments>
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