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    <link>https://jira.mongodb.org</link>
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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-47167] Make hedged read tests more robust</title>
                <link>https://jira.mongodb.org/browse/SERVER-47167</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The test setup in hedged_reads.js and hedging_metrics_server_status.js currently have unintended effects on commands that are run outside of the test cases. This has led to various failures on evergreen.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The failpoint &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37cc846c365b41f6ba238eb694008c4d3713f792/src/mongo/executor/network_interface_tl.cpp#L423&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;networkInterfaceSendRequestsToTargetHostsInAlphabeticalOrder&#160;&lt;/a&gt;forces NetworkInterfaceTL to&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/executor/network_interface_tl.cpp#L509&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wait to acquire a connection from each target host&lt;/a&gt;&#160;so that requests can be sent in deterministic order. However, since the command&apos;s&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/37cc846c365b41f6ba238eb694008c4d3713f792/src/mongo/executor/network_interface_tl.cpp#L288&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;timer&lt;/a&gt;&#160;is&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/37cc846c365b41f6ba238eb694008c4d3713f792/src/mongo/executor/network_interface_tl.cpp#L527&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;not set until the request is about to get sent after the connection is already acquired&lt;/a&gt;, all commands are effectively run without timeouts when this failpoint is enabled. That leads to various unexpected behaviors such as timeouts (see BF-16720 and BF-16680--). To solve this, we should add a predicate to the failpoint so that it can only be entered when the operation should be hedged.&#160;&lt;/li&gt;
	&lt;li&gt;The tests use blockConnection to simulate delays on target nodes. When the failpoint is enabled, other commands could also block (e.g. mirrored commands). This causes the command to run longer than it should (the block time is 5mn) and sometimes lead to failures. To solve this, we should use mode {times: 1} and pass namespace into data so only one command will be blocked on each node.&lt;/li&gt;
	&lt;li&gt;Unfortunately, _killOperations sent to the slower node by NetworkInterfaceTL when the command finishes could sometimes arrive and finish on the &quot;slower&quot; node before the command starts on that node. So the operation will never get killed. This is an undesirable behavior. However, it is caused by the delay on the host itself so there is no obvious way around it yet. For now, we should make the command block on the faster node for some time to allow the operation to start on the slower node.&#160;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1294601">SERVER-47167</key>
            <summary>Make hedged read tests more robust</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 Mar 2020 22:01:52 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:13 +0000</updated>
                            <resolved>Mon, 30 Mar 2020 01:50:09 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3012250" author="xgen-internal-githook" created="Mon, 30 Mar 2020 02:12:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47167&quot; title=&quot;Make hedged read tests more robust&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47167&quot;&gt;&lt;del&gt;SERVER-47167&lt;/del&gt;&lt;/a&gt; Make hedged read tests more robust&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ffff3f7fce95d45192c8b6cb65845907d6128922)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/73deb0a22f6b3fd1cfdf525499608100d4340dd2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/73deb0a22f6b3fd1cfdf525499608100d4340dd2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3012240" author="xgen-internal-githook" created="Mon, 30 Mar 2020 01:48:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47167&quot; title=&quot;Make hedged read tests more robust&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47167&quot;&gt;&lt;del&gt;SERVER-47167&lt;/del&gt;&lt;/a&gt; Make hedged read tests more robust&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ffff3f7fce95d45192c8b6cb65845907d6128922&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ffff3f7fce95d45192c8b6cb65845907d6128922&lt;/a&gt;&lt;/p&gt;</comment>
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