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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-6322] Unbalanced read load on secondaries caused replRead.js in slowNightly to fail</title>
                <link>https://jira.mongodb.org/browse/SERVER-6322</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://buildlogs.mongodb.org/build/4ff70222d2a60f11a9000e2c/test/4ff70224d2a60f11c7000dd5/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://buildlogs.mongodb.org/build/4ff70222d2a60f11a9000e2c/test/4ff70224d2a60f11c7000dd5/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Excerpt from logs:&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@/home/yellow/buildslave/Linux_64bit_DUR_OFF/mongo/jstests/slowNightly/replReads.js:118&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Fri Jul  6 11:20:41 warning: log line attempted (10k) over max size(10k), printing beginning and end ... uncaught exception: [10] != [20] are not equal : Wrong number of read queries sent to secondary 0 [&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="43550">SERVER-6322</key>
            <summary>Unbalanced read load on secondaries caused replRead.js in slowNightly to fail</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>buildbot</label>
                    </labels>
                <created>Fri, 6 Jul 2012 15:37:12 +0000</created>
                <updated>Mon, 11 Jul 2016 18:32:53 +0000</updated>
                            <resolved>Mon, 9 Jul 2012 19:07:35 +0000</resolved>
                                    <version>2.1.2</version>
                                    <fixVersion>2.2.0-rc0</fixVersion>
                                    <component>Internal Client</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="140971" author="auto" created="Mon, 9 Jul 2012 19:05:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-06T08:47:47-07:00&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6322&quot; title=&quot;Unbalanced read load on secondaries caused replRead.js in slowNightly to fail&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6322&quot;&gt;&lt;del&gt;SERVER-6322&lt;/del&gt;&lt;/a&gt; Unbalanced read load on secondaries caused replRead.js in slowNightly to fail&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3b0834143f69813e27cc08fca4a06a1cf1f97c5d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3b0834143f69813e27cc08fca4a06a1cf1f97c5d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="140369" author="renctan" created="Fri, 6 Jul 2012 15:56:02 +0000"  >&lt;p&gt;Cause: the last host passed to the _selectNode method for round robin selection comes from the DBClientReplicaSet which is always initialized as an empty host for a newly created connection. This in turn will make _selectNode always select the same node at the first time a slaveOk operation is performed on DBClientReplicaSet.&lt;/p&gt;

&lt;p&gt;Fix: store the last host information in the ReplicaSetMonitor, just like the _nextSlave member variable used by the now deprecated getSlave() method (which only exists because it was part of the public interface).&lt;/p&gt;</comment>
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