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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-11261] SlaveOk won&apos;t work after slave had a network exception</title>
                <link>https://jira.mongodb.org/browse/SERVER-11261</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If network exception occurs when mongos read response from secondary, Mongos will call function &amp;lt;isntSecondary&amp;gt; . Mongos will perhaps choose PRIMARY for query, and this decision will be keeped in this woker thread&apos;s lifetime, SlaveOk won&apos;t work.&lt;/p&gt;</description>
                <environment>Linux</environment>
        <key id="94762">SERVER-11261</key>
            <summary>SlaveOk won&apos;t work after slave had a network exception</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="hustchensi">chensi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Oct 2013 01:46:50 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:13 +0000</updated>
                            <resolved>Fri, 18 Oct 2013 14:18:00 +0000</resolved>
                                    <version>2.2.4</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="443631" author="hustchensi" created="Mon, 21 Oct 2013 02:06:13 +0000"  >&lt;p&gt;The logic as you have said is quite right. But network exception is not often, switching the query back to the previous slave node have little effective &lt;/p&gt;</comment>
                            <comment id="442924" author="renctan" created="Fri, 18 Oct 2013 14:17:48 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;Mongos will pin a node once it was chosen for the thread until an error occurred or settings changed (read preference changed). The motivation for this behavior is to avoid reading back in time as much as possible. Example of &quot;reading back in time&quot; if the nodes are not pinned.&lt;/p&gt;

&lt;p&gt;Ops:&lt;br/&gt;
1. insert doc A&lt;br/&gt;
2. update doc A.&lt;/p&gt;

&lt;p&gt;Replset status:&lt;br/&gt;
P: ok&lt;br/&gt;
S1: applied up to op#1&lt;br/&gt;
S2: applied up to op#2&lt;/p&gt;

&lt;p&gt;1. Mongos chose S2 for a query. Updated doc A is returned.&lt;br/&gt;
2. A query is performed again, this time, S1 is chosen, old doc A is returned.&lt;/p&gt;

&lt;p&gt;As you can see, this can be very confusing, so mongos tries it&apos;s best to stick to the same node after it is chosen to avoid this situation.&lt;/p&gt;</comment>
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