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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-25969] When featureCompatibilityVersion is 3.2, a 3.4 node can&apos;t initial sync decimal data</title>
                <link>https://jira.mongodb.org/browse/SERVER-25969</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the primary has &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; 3.4, and during initial sync, we copy over decimal data before copying &lt;tt&gt;admin.system.version&lt;/tt&gt;, then we reject the decimal data, and the initial sync fails.&lt;/p&gt;

&lt;p&gt;We would also like to successfully initial sync from a primary with &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; 3.2 that has decimal data, since a user can get into this state by inserting decimal data and then setting &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; to 3.2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="314336">SERVER-25969</key>
            <summary>When featureCompatibilityVersion is 3.2, a 3.4 node can&apos;t initial sync decimal data</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Sep 2016 17:37:43 +0000</created>
                <updated>Sat, 19 Nov 2016 00:06:06 +0000</updated>
                            <resolved>Tue, 20 Sep 2016 22:01:29 +0000</resolved>
                                                    <fixVersion>3.3.14</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1389303" author="xgen-internal-githook" created="Tue, 20 Sep 2016 22:00:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25969&quot; title=&quot;When featureCompatibilityVersion is 3.2, a 3.4 node can&amp;#39;t initial sync decimal data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25969&quot;&gt;&lt;del&gt;SERVER-25969&lt;/del&gt;&lt;/a&gt; make slaves and secondaries always use BSON 1.1 validation&lt;/p&gt;

&lt;p&gt;This allows secondaries and slaves to sync NumberDecimal even while&lt;br/&gt;
in featureCompatibilityVersion:&quot;3.2&quot; mode.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2ac0e07e7f82406e989fa272c68d1205ced81d78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2ac0e07e7f82406e989fa272c68d1205ced81d78&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1377615" author="schwerin" created="Tue, 6 Sep 2016 19:18:05 +0000"  >&lt;p&gt;That&apos;s not good enough. The primary might have decimal data, say, even though it has since had its FCV set to 3.2. The initial sync should not fail because of this.&lt;/p&gt;</comment>
                            <comment id="1377608" author="scotthernandez" created="Tue, 6 Sep 2016 19:13:01 +0000"  >&lt;p&gt;This seems to be because we start fetching documents (and storing them) before we clone the admin db, to get the upstream setting. Do you have a call-stack from exactly where this happens?&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;
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				&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;[replication-1] Error fetching oplog during initial sync: InvalidBSON: Cannot use decimal BSON type when the featureCompatibilityVersion is 3.2. See http://dochub.mongodb.org/core/3.4-feature-compatibility.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Initial sync does disable other types of validation (like document validation and index constraints) so if there was a way for initial sync to disable this while it executes that would probably be fine.&lt;/p&gt;</comment>
                            <comment id="1377592" author="tess.avitabile" created="Tue, 6 Sep 2016 18:55:25 +0000"  >&lt;p&gt;The secondary validates the incoming BSON. I&apos;m not sure if there is a way to prevent that (or if it is desirable). We could check in rpc/object_check.h whether we are the primary in order to decide which BSON validation version to use, but I&apos;m not sure we&apos;d want to introduce that dependency. If there were a way to construct a Validator&amp;lt;BSONObj&amp;gt; with a particular BSON validation version, we might be able to do that.&lt;/p&gt;</comment>
                            <comment id="1377586" author="schwerin" created="Tue, 6 Sep 2016 18:48:59 +0000"  >&lt;p&gt;Shouldn&apos;t we just assume that the upstream node was doing the right thing, and accept whatever data it gives us?&lt;/p&gt;</comment>
                    </comments>
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