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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-19100] Start WiredTiger engine with the config_base=false</title>
                <link>https://jira.mongodb.org/browse/SERVER-19100</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://source.wiredtiger.com/2.5.2/group__wt.html#ga9e6adae3fc6964ef837a62795c7840ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Documentation for the &lt;tt&gt;config_base&lt;/tt&gt; option here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;WiredTiger starts up with a &lt;tt&gt;WiredTiger.basecfg&lt;/tt&gt; file in the &lt;tt&gt;dbpath&lt;/tt&gt; by default on initial startup.  This can cause needless issues with backwards compatibility, eg. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19073&quot; title=&quot;MongoDB WiredTiger 3.0.2 is not backward compatible with data files created with 3.0.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19073&quot;&gt;&lt;del&gt;SERVER-19073&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In addition to not creating the file for new instances, we should remove/ignore the file on existing clusters.&lt;/p&gt;</description>
                <environment></environment>
        <key id="212627">SERVER-19100</key>
            <summary>Start WiredTiger engine with the config_base=false</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="david.hows">David Hows</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Jun 2015 01:02:49 +0000</created>
                <updated>Wed, 23 Sep 2015 21:53:57 +0000</updated>
                            <resolved>Tue, 25 Aug 2015 02:07:21 +0000</resolved>
                                                    <fixVersion>3.1.8</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1013561" author="xgen-internal-githook" created="Tue, 25 Aug 2015 05:23:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;David Hows&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19100&quot; title=&quot;Start WiredTiger engine with the config_base=false&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19100&quot;&gt;&lt;del&gt;SERVER-19100&lt;/del&gt;&lt;/a&gt; - re-add missing failedConn lines into upgrade/downgrade test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/07728dc1e6721a3fe7c410fbb9ed28c316afe09b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/07728dc1e6721a3fe7c410fbb9ed28c316afe09b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1013501" author="xgen-internal-githook" created="Tue, 25 Aug 2015 02:06:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;David Hows&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19100&quot; title=&quot;Start WiredTiger engine with the config_base=false&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19100&quot;&gt;&lt;del&gt;SERVER-19100&lt;/del&gt;&lt;/a&gt; - disable config_base in WT Conn string&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8d4c5f743d1a72238a533cc4c69b75f3fbdbe637&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8d4c5f743d1a72238a533cc4c69b75f3fbdbe637&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1011389" author="david.hows" created="Fri, 21 Aug 2015 01:40:25 +0000"  >&lt;p&gt;Yes, &lt;a href=&quot;https://evergreen.mongodb.com/version/55d551623ff1223ae100008c_0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/version/55d551623ff1223ae100008c_0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1011378" author="michael.cahill" created="Fri, 21 Aug 2015 01:13:36 +0000"  >&lt;p&gt;Is there a new Evergreen build, including &lt;tt&gt;multiversion_WT&lt;/tt&gt;?&lt;/p&gt;</comment>
                            <comment id="1009749" author="xgen-internal-githook" created="Wed, 19 Aug 2015 16:42:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;IanWhalen&apos;, u&apos;name&apos;: u&apos;Ian Whalen&apos;, u&apos;email&apos;: u&apos;ian.whalen@gmail.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19100&quot; title=&quot;Start WiredTiger engine with the config_base=false&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19100&quot;&gt;&lt;del&gt;SERVER-19100&lt;/del&gt;&lt;/a&gt; - disable config_base in WT Conn string&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 6be756dd654c03049c094c55cb038b0b3305631b.&lt;/p&gt;

&lt;p&gt;Reverting due to failure in multiversion/upgrade_downgrade_mongod.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f35b70aa777cab34c0fa6e4595604deb6e80ca57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f35b70aa777cab34c0fa6e4595604deb6e80ca57&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1009682" author="milkie" created="Wed, 19 Aug 2015 15:58:42 +0000"  >&lt;p&gt;I believe this broke the multiversion test suite.&lt;/p&gt;</comment>
                            <comment id="1009232" author="xgen-internal-githook" created="Wed, 19 Aug 2015 06:08:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;David Hows&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19100&quot; title=&quot;Start WiredTiger engine with the config_base=false&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19100&quot;&gt;&lt;del&gt;SERVER-19100&lt;/del&gt;&lt;/a&gt; - disable config_base in WT Conn string&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6be756dd654c03049c094c55cb038b0b3305631b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6be756dd654c03049c094c55cb038b0b3305631b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1007909" author="michael.cahill" created="Tue, 18 Aug 2015 05:56:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daveh86&quot; class=&quot;user-hover&quot; rel=&quot;daveh86&quot;&gt;daveh86&lt;/a&gt;, I&apos;ve assigned this to you.&lt;/p&gt;

&lt;p&gt;Note that there are two parts to it: the obvious one is to set &lt;tt&gt;config_base=false&lt;/tt&gt; in the config string that MongoDB passes to WiredTiger.  The second part is about backwards compatibility: that flag currently just controls whether WiredTiger will &lt;b&gt;create&lt;/b&gt; the basecfg file.  It doesn&apos;t control whether WiredTiger will &lt;b&gt;read&lt;/b&gt; one that already exists.&lt;/p&gt;

&lt;p&gt;So we need to either change WiredTiger to ignore existing basecfg files or change MongoDB to remove them if they exist on startup.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="202618">SERVER-18356</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="200978">SERVER-18250</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="212345">SERVER-19073</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="215329">WT-1999</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="202620">WT-1923</issuekey>
        </issuelink>
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