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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-43232] Eliminate the trailing comma when opening &quot;overwrite=false&quot; index cursors </title>
                <link>https://jira.mongodb.org/browse/SERVER-43232</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42218&quot; title=&quot;Enable getCursor() in the RecordStore to retrieve checkpoint cursors for WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42218&quot;&gt;&lt;del&gt;SERVER-42218&lt;/del&gt;&lt;/a&gt;&#160;changed the default configuration string for normal index cursors from&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d8de0a489533877bbedc22e1480156f50401b13#diff-9ab88ddb5e1d8d1ee91f0ce9d9d823bcL120&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;overwrite=false&quot;&lt;/a&gt;&#160;to the string&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d8de0a489533877bbedc22e1480156f50401b13#diff-645b0ac36d48b01aec5d1176f98d1622R51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;overwrite=false,&quot;&lt;/a&gt;. The difference is the trailing comma at the end.&lt;/p&gt;

&lt;p&gt;The WiredTiger cursor cache has&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2c3e8294acf82fff975a620b5fc45778c6ef2a45/src/third_party/wiredtiger/src/cursor/cur_std.c#L730-L733&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an optimization to skip parsing the config string&lt;/a&gt;, but only if it is&#160;&lt;b&gt;exactly&lt;/b&gt;&#160;equal to &quot;overwrite=false&quot;.&#160;In this case, the additional comma eluded the fast-path and required WiredTiger to parse the config string for every index cursor. This introduced performance regressions on workloads that open many index cursors.&lt;/p&gt;

&lt;p&gt;The fix should be to construct a comma-less &quot;overwrite=false&quot; config string for normal index cursors.&lt;/p&gt;</description>
                <environment></environment>
        <key id="920687">SERVER-43232</key>
            <summary>Eliminate the trailing comma when opening &quot;overwrite=false&quot; index cursors </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="13201">Fixed</resolution>
                                        <assignee username="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Sep 2019 17:33:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:17:22 +0000</updated>
                            <resolved>Tue, 10 Sep 2019 17:20:28 +0000</resolved>
                                    <version>4.3.1</version>
                                    <fixVersion>4.3.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2414843" author="xgen-internal-githook" created="Tue, 10 Sep 2019 17:05:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;username&apos;: &apos;louiswilliams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43232&quot; title=&quot;Eliminate the trailing comma when opening &amp;quot;overwrite=false&amp;quot; index cursors &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43232&quot;&gt;&lt;del&gt;SERVER-43232&lt;/del&gt;&lt;/a&gt; Eliminate the trailing comma when opening &apos;overwrite=false&apos; index cursors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/740edbcd17406d7e2d4d11e67625b6f14a510977&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/740edbcd17406d7e2d4d11e67625b6f14a510977&lt;/a&gt;&lt;/p&gt;</comment>
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