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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-27892] Clarify locking rules for _canAcceptNonLocalWrites and _canServeNonLocalReads</title>
                <link>https://jira.mongodb.org/browse/SERVER-27892</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="351022">SERVER-27892</key>
            <summary>Clarify locking rules for _canAcceptNonLocalWrites and _canServeNonLocalReads</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="9">Done</resolution>
                                        <assignee username="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Feb 2017 00:41:17 +0000</created>
                <updated>Thu, 28 Jan 2021 23:51:43 +0000</updated>
                            <resolved>Fri, 6 Oct 2017 17:30:08 +0000</resolved>
                                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3588719" author="shane.harvey" created="Thu, 28 Jan 2021 23:51:43 +0000"  >&lt;p&gt;I&apos;m doing a bit of error code research for DRIVERS-1152 and discovered this change improved mapReduce error reporting when mistakenly executing a non-inline mapReduce command on a secondary. Before this change (on MongoDB &amp;lt;=3.4) the secondary would return this generic error without an error code:&lt;/p&gt;
&lt;p/&gt;
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					&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;{&apos;ok&apos;: 0.0, &apos;errmsg&apos;: &apos;not master&apos;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;After this change (on MongoDB &amp;gt;=3.6) the secondary returns PrimarySteppedDown with an error code: &lt;/p&gt;
&lt;p/&gt;
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					&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;{&apos;ok&apos;: 0.0, &apos;errmsg&apos;: &apos;no longer primary while dropping temporary collection for mapReduce: test.tmp.mr.test_1&apos;, &apos;code&apos;: 189, &apos;codeName&apos;: &apos;PrimarySteppedDown&apos;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
                            <comment id="1691718" author="xgen-internal-githook" created="Fri, 6 Oct 2017 17:29:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;spencer@mongodb.com&apos;, &apos;name&apos;: &apos;Spencer T Brody&apos;, &apos;username&apos;: &apos;stbrody&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27892&quot; title=&quot;Clarify locking rules for _canAcceptNonLocalWrites and _canServeNonLocalReads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27892&quot;&gt;&lt;del&gt;SERVER-27892&lt;/del&gt;&lt;/a&gt; Clarify locking rules for _canAcceptNonLocalWrites&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ce87416479155a9cf8e38a0f6b0c6bad194c9cfc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ce87416479155a9cf8e38a0f6b0c6bad194c9cfc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1689212" author="xgen-internal-githook" created="Wed, 4 Oct 2017 17:27:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;spencer@mongodb.com&apos;, &apos;name&apos;: &apos;Spencer T Brody&apos;, &apos;username&apos;: &apos;stbrody&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27892&quot; title=&quot;Clarify locking rules for _canAcceptNonLocalWrites and _canServeNonLocalReads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27892&quot;&gt;&lt;del&gt;SERVER-27892&lt;/del&gt;&lt;/a&gt; Fix find and getMore commands to only check whether they can run after acquiring locks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cea80793198c198fc2819808982ac3d5ef7c1105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cea80793198c198fc2819808982ac3d5ef7c1105&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1529877" author="xgen-internal-githook" created="Tue, 21 Mar 2017 22:12:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27892&quot; title=&quot;Clarify locking rules for _canAcceptNonLocalWrites and _canServeNonLocalReads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27892&quot;&gt;&lt;del&gt;SERVER-27892&lt;/del&gt;&lt;/a&gt; Don&apos;t call canAcceptWritesFor in mapReduce until after grabing locks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7cd3934080fcf0a14e8133074cd77598285126a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7cd3934080fcf0a14e8133074cd77598285126a1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1507421" author="spencer" created="Thu, 23 Feb 2017 18:52:34 +0000"  >&lt;p&gt;Note, stepdown command currently takes global lock in S mode - this is needed in order to allow secondaries to continue catching up as the stepdown is pending.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="369166">SERVER-28544</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="357081">SERVER-28103</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="341793">SERVER-27555</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="356979">SERVER-28097</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="147685">SERVER-14601</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="420525">SERVER-30852</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="441420">SERVER-31431</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="441421">SERVER-31432</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="351619">SERVER-27914</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="351614">SERVER-27911</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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