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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-29096] Set readPreference to secondary in causally_consistent_jscore_passthrough suite</title>
                <link>https://jira.mongodb.org/browse/SERVER-29096</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently all the reads in jscore suite run under causally_consistent_jscore_passthrough executor send to the primary. Once the safe secondary reads project is completed it should send the reads to secondary. For that &lt;br/&gt;
1. enable_causal_consitency.js need to add the following line&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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-top: 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;db.getMongo().setReadPref(&quot;secondary&quot;);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;2. As setReadPref(&quot;secondary&quot;) doesn&apos;t actually do anything&lt;br/&gt;
on the underlying DBClientReplicaSet instance to ensure all appropriate&lt;br/&gt;
operations are routed to the secondary. The value is read via getReadPrefMode()&lt;br/&gt;
when calling DB.prototype.runReadCommand() and causes the command object to be&lt;br/&gt;
wrapped as &lt;/p&gt;
{query: cmdObj, $readPreference: getReadPref()}
&lt;p&gt;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/shell/db.js#L100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/shell/db.js#L100&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Hence, need  override Mongo.prototype.runCommand() to&lt;br/&gt;
ensure that the command object is getting wrapped for all appropriate&lt;br/&gt;
operations. For example, in tests such as&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.6/jstests/core/find_getmore_cmd.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.6/jstests/core/find_getmore_cmd.js&lt;/a&gt;&lt;br/&gt;
that explicitly do runCommand(&lt;/p&gt;
{find: ...}
&lt;p&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="381317">SERVER-29096</key>
            <summary>Set readPreference to secondary in causally_consistent_jscore_passthrough suite</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="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="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 May 2017 20:23:34 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:59 +0000</updated>
                            <resolved>Thu, 3 Aug 2017 23:17:30 +0000</resolved>
                                                    <fixVersion>3.5.12</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1645611" author="xgen-internal-githook" created="Thu, 10 Aug 2017 20:58:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Misha Tyulenev&apos;, &apos;email&apos;: &apos;misha@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29096&quot; title=&quot;Set readPreference to secondary in causally_consistent_jscore_passthrough suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29096&quot;&gt;&lt;del&gt;SERVER-29096&lt;/del&gt;&lt;/a&gt; set readPreference to secondary in causally_consistent_jscore_passthrough suite&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5ab64bbe07e98b7cc0b8a88b6adb3b348e174651&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5ab64bbe07e98b7cc0b8a88b6adb3b348e174651&lt;/a&gt;&lt;/p&gt;</comment>
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