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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35167] AsyncResultsMerger can block networking threads in callbacks</title>
                <link>https://jira.mongodb.org/browse/SERVER-35167</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;The AsyncResultsMerger holds a lock while it runs callbacks, and while it calls nextEvent()&lt;/li&gt;
	&lt;li&gt;running askForNextBatch_inlock does repl targetting&lt;/li&gt;
	&lt;li&gt;repl targetting can hang for up to 20 seconds&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The bad scenario is:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Bunch of remotes are established&lt;/li&gt;
	&lt;li&gt;The first host suceeds in targetting and runs&lt;/li&gt;
	&lt;li&gt;The second host cannot satisfy it&apos;s read pref, blocking holding a lock in nextEvent()&lt;/li&gt;
	&lt;li&gt;The first request comes back, blocking on the mutex waiting to call handleBatchResponse&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If you have enough of those, you saturate all the background networking threads and hang your mongos.&lt;/p&gt;

&lt;p&gt;This isn&apos;t a problem in 3.6 and later because targetting was moved into the ARS and&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34582&quot; title=&quot;AsyncRequestsSender can block network threads during construction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34582&quot;&gt;&lt;del&gt;SERVER-34582&lt;/del&gt;&lt;/a&gt; fixes the problem there&lt;/p&gt;</description>
                <environment></environment>
        <key id="547737">SERVER-35167</key>
            <summary>AsyncResultsMerger can block networking threads in callbacks</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 May 2018 18:46:48 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:25 +0000</updated>
                            <resolved>Thu, 6 Feb 2020 14:06:58 +0000</resolved>
                                    <version>3.2.20</version>
                    <version>3.4.15</version>
                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="2810103" author="sheeri.cabral" created="Thu, 6 Feb 2020 14:06:58 +0000"  >&lt;p&gt;minimum supported version is 3.6, and this issue is only &amp;lt;3.6&lt;/p&gt;</comment>
                            <comment id="1903646" author="kaloian.manassiev" created="Tue, 29 May 2018 17:57:48 +0000"  >&lt;p&gt;Unfortunately, this is very hard to fix in the 3.4 code base since it would require making the replica set monitor event-driven. Given that 3.2 and 3.4 have been out for a while and since it is an extremely rare condition, I am putting it on the Backlog.&lt;/p&gt;</comment>
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