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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-20604] CSRS with protocol version 1 is slow when doing reads from secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-20604</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="231327">SERVER-20604</key>
            <summary>CSRS with protocol version 1 is slow when doing reads from secondaries</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Sep 2015 14:29:57 +0000</created>
                <updated>Fri, 19 May 2017 09:49:50 +0000</updated>
                            <resolved>Tue, 6 Oct 2015 14:09:54 +0000</resolved>
                                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1055280" author="xgen-internal-githook" created="Thu, 8 Oct 2015 13:49:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20604&quot; title=&quot;CSRS with protocol version 1 is slow when doing reads from secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20604&quot;&gt;&lt;del&gt;SERVER-20604&lt;/del&gt;&lt;/a&gt; fix getMoreRequest.toBSON&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fcb0320edf3a82ab644433319eb717db29532485&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fcb0320edf3a82ab644433319eb717db29532485&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1052377" author="xgen-internal-githook" created="Tue, 6 Oct 2015 13:30:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20604&quot; title=&quot;CSRS with protocol version 1 is slow when doing reads from secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20604&quot;&gt;&lt;del&gt;SERVER-20604&lt;/del&gt;&lt;/a&gt; unblock AwaitData queries if commit level needs updating downstream.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a8e6c0ebc70fad95a5e05281076cfa4b6db500c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a8e6c0ebc70fad95a5e05281076cfa4b6db500c2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1050231" author="milkie" created="Fri, 2 Oct 2015 20:06:38 +0000"  >&lt;p&gt;Also, we need to send up the current known commit level, so that we can return immediately from getMore and not block, if the commit level has already advanced.  Otherwise, we will block waiting for the AwaitData timeout and won&apos;t update the commit level in a timely manner.&lt;/p&gt;</comment>
                            <comment id="1050129" author="milkie" created="Fri, 2 Oct 2015 18:32:53 +0000"  >&lt;p&gt;This is partly due to AwaitData delaying the propagation of the commit level down to the secondaries from the primary.  If we can signal the AwaitData to return immediately when the commit level changes, this should go a long way to speeding up reads from secondaries.&lt;/p&gt;</comment>
                            <comment id="1042570" author="spencer" created="Thu, 24 Sep 2015 19:56:55 +0000"  >&lt;p&gt;We should revert &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1af86515e2fa8b12ef697a4c1fc573ac6ae3cd03/src/mongo/shell/shardingtest.js#L351&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt; once this has been fixed&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="232409">SERVER-20722</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="233355">SERVER-20800</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="230500">SERVER-20493</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="384758">SERVER-29275</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="232662">SERVER-20749</issuekey>
        </issuelink>
                            </inwardlinks>
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