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    <title>MongoDB Jira</title>
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    <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>[JAVA-202] Load balancing read requests between slaves in a replica set</title>
                <link>https://jira.mongodb.org/browse/JAVA-202</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;I&apos;ve made a read-heavy benchmark on a replica set with 1 master and 3 slaves. The client is using the java driver and set the slaveOk(), but the repartition of the requests was unequal.&lt;/p&gt;

&lt;p&gt;The loads of the servers were:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;0.02 for the master (I think the client send it only the very few writes)&lt;/li&gt;
	&lt;li&gt;60 for the first slave (it was the goal of the bench to push MongoDB to its limits)&lt;/li&gt;
	&lt;li&gt;5 on the second slave&lt;/li&gt;
	&lt;li&gt;only 2 on the last slave.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I was expecting that the load on the 3 slaves was similar.&lt;/p&gt;</description>
                <environment>4 servers with 8 cores</environment>
        <key id="13506">JAVA-202</key>
            <summary>Load balancing read requests between slaves in a replica set</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="brmichel">Bruno Michel</reporter>
                        <labels>
                    </labels>
                <created>Tue, 26 Oct 2010 11:21:11 +0000</created>
                <updated>Fri, 29 Oct 2010 02:48:53 +0000</updated>
                            <resolved>Wed, 27 Oct 2010 20:10:19 +0000</resolved>
                                    <version>2.2</version>
                                    <fixVersion>2.3</fixVersion>
                                    <component>Cluster Management</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="19693" author="brmichel" created="Wed, 27 Oct 2010 10:38:51 +0000"  >&lt;p&gt;&amp;gt; Part of the algorithm is ping time to nodes - are these all located on the same network?&lt;/p&gt;

&lt;p&gt;Yes, the 4 servers are on the same network (more precisely, on the same dedicated switch).&lt;/p&gt;

&lt;p&gt;&amp;gt; Can you try with HEAD of the driver?&lt;/p&gt;

&lt;p&gt;I&apos;ll try it next week.&lt;/p&gt;</comment>
                            <comment id="19686" author="eliot" created="Wed, 27 Oct 2010 04:47:29 +0000"  >&lt;p&gt;Just made some improvements.&lt;br/&gt;
Part of the algorithm is ping time to nodes - are these all located on the same network?&lt;br/&gt;
Can you try with HEAD of the driver?&lt;/p&gt;</comment>
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