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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-19872] logging subsystem may block the event loop in NetworkInterfaceASIO</title>
                <link>https://jira.mongodb.org/browse/SERVER-19872</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Loging calls can periodically block the calling thread in our logsystem when we fsync the log file. &lt;/p&gt;

&lt;p&gt;Although we have not empirically measured the impact of this on NetworkInterfaceASIO, there is an assumption in the design of NIA that threads running in the event loop should never be blocked. If the event loop is blocked by the logging subsystem, this could potentially cause network operation handling to block as well.&lt;/p&gt;

&lt;p&gt;We should investigate potential workarounds, including implementing limited support for asynchronous logging.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt; &lt;/p&gt;</description>
                <environment></environment>
        <key id="225144">SERVER-19872</key>
            <summary>logging subsystem may block the event loop in NetworkInterfaceASIO</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="adam.midvidy">Adam Midvidy</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Aug 2015 19:35:50 +0000</created>
                <updated>Tue, 6 Dec 2022 04:46:34 +0000</updated>
                            <resolved>Tue, 29 Oct 2019 17:19:57 +0000</resolved>
                                                                    <component>Logging</component>
                    <component>Networking</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2507011" author="jason.carey" created="Tue, 29 Oct 2019 17:19:57 +0000"  >&lt;p&gt;We&apos;ve lived with blocking logging on networking threads for years.  I don&apos;t think we&apos;re going to end up fixing this&lt;/p&gt;</comment>
                            <comment id="1003961" author="schwerin" created="Thu, 13 Aug 2015 01:06:48 +0000"  >&lt;p&gt;I believe that implementing a non-blocking, best-effort logging subsystem is out of scope for the network interface asio project. The actual networking code in NetworkInterfaceASIO shouldn&apos;t log much at the default log level, anyways &amp;#8211; maybe nothing &amp;#8211; and we can stipulate that the callbacks must not log, just as they must not acquire database locks or perform other blocking actions.&lt;/p&gt;

&lt;p&gt;Eventually, I believe we&apos;ll want to replace the entire implementation of the logging system with one that supports best-effort asynchronous logging, at least for certain timing-sensitive paths like replication liveness transmission and the async networking layer, but I do not think it is necessary at this time.&lt;/p&gt;</comment>
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