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    <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-63792] Improve coverage of blackholing network requests</title>
                <link>https://jira.mongodb.org/browse/SERVER-63792</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is likely a gap in our test coverage that can lead to longer unavailability windows than we&apos;d like.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1985957">SERVER-63792</key>
            <summary>Improve coverage of blackholing network requests</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
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                <created>Thu, 17 Feb 2022 20:41:29 +0000</created>
                <updated>Tue, 6 Dec 2022 00:30:55 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4370319" author="robert.guo" created="Tue, 22 Feb 2022 22:57:50 +0000"  >&lt;p&gt;Hm interesting question. We have the datacenter delay simulation mechanism in DSI using &lt;tt&gt;tc&lt;/tt&gt; that could trigger TCP retransmissions with a couple of small tweaks; the same invocation can be run in JS tests. But if we want to just test that this sequence of events do not cause additional delays, mongobridge&apos;s &lt;tt&gt;delayMessagesFrom&lt;/tt&gt; and a timer might be sufficient? The latter may be more deterministic and quicker. &lt;/p&gt;

&lt;p&gt;Another thing to systematically catch this type of issue that we should be able to do if there&apos;s enough value/interest is to add/extend a passthrough that delays commands at random with a fixed seed. If the resulting delay to running the next command is beyond some threshold, e.g. &amp;gt; 5x the delay amount of the original command, the test reports this increase in latency to the user.&lt;/p&gt;</comment>
                            <comment id="4364379" author="judah.schvimer" created="Fri, 18 Feb 2022 17:00:04 +0000"  >&lt;p&gt;We should ensure to include testing of sharded clusters with black holes between mongos and mongod and between shards as well.&lt;/p&gt;</comment>
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            <issuekey id="1979334">SERVER-63417</issuekey>
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            <issuekey id="1980808">SERVER-63512</issuekey>
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