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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-41904] Change Events: fullDocument field is unexpectedly NULL</title>
                <link>https://jira.mongodb.org/browse/SERVER-41904</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We would like to report an issue where fullDocument field in ChangeEvent is not being populated&#160;every time&#160;and is NULL at times, for &apos;Update&apos; operation type.&lt;br/&gt;
Can you please let us know if it is an issue in MongoDB or it is expected to be NULL in certain scenarios (apart from when document is deleted or collection is dropped or renamed)?&lt;br/&gt;
&#160;&lt;br/&gt;
&lt;b&gt;Environment Details:&lt;/b&gt;&lt;br/&gt;
mongos: 3 servers (with 3 config servers)&lt;br/&gt;
mongod: 3 sharded replica sets, with each having one primary, two secondaries, and one arbiter&lt;br/&gt;
Mongo version: 4.0.5&lt;br/&gt;
Client Java Driver version: 3.10.1&lt;br/&gt;
&#160;&lt;br/&gt;
Write concern: w:1&lt;br/&gt;
Read preference:Primary&lt;br/&gt;
Read concern:Not configured (default)&lt;br/&gt;
&#160;&lt;br/&gt;
&lt;b&gt;Operations:&lt;/b&gt;&lt;br/&gt;
Insert a documentwith TxId:1234&lt;br/&gt;
Update-1 on inserted document&lt;br/&gt;
Update-2 on inserted document&lt;br/&gt;
Update-3 on inserted document&lt;br/&gt;
&#160;&lt;br/&gt;
&lt;b&gt;Issue:&lt;/b&gt; &lt;br/&gt;
Client is rightly receiving the Insert events and is able to find the document in fullDocument field,&lt;br/&gt;
However it&#160;is not finding document in every&#160;&lt;b&gt;update change event in fullDocument field, and at times it is NULL&lt;/b&gt;&lt;br/&gt;
&#160;&lt;br/&gt;
Connector watches change streams for Insert and Update events&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;   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; mongoCollection = mongoClient.getDatabase(mongodb_database).getCollection(mongodb_collection).withReadPreference(ReadPreference.primary());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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; cursor =&#160;mongoCollection.watch(pipeline).fullDocument(FullDocument.UPDATE_LOOKUP).iterator();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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;&#160;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;In poll method:&lt;br/&gt;
&#160;&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;
		&lt;tbody &gt;
				&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;   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;&#160; &#160; &#160; &#160; &#160; &#160;&#160; ChangeStreamDocument&amp;lt;Document&amp;gt; next = cursor.tryNext();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;&#160; &#160; &#160; &#160; &#160; &#160;&#160; if (null != next) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;                 Document fullDocument = next.getFullDocument();   //  (This field is NULL)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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;&#160;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/p&gt;

&lt;p&gt;Questions:&lt;br/&gt;
1.&#160;As per documentation we found, fullDocument is expected to be null when a document is deleted or a collection is dropped or renamed, but in our cases, neither of this is done.&lt;br/&gt;
We would like to understand why this field isn&apos;t being populated.&lt;br/&gt;
&#160;&lt;br/&gt;
2. As write and reads are from primary, and change event being generated inherently after &apos;majority&apos; commit, is there a possibility that reads might be going to secondary?&lt;br/&gt;
&#160;&lt;br/&gt;
3. We have a similar infrastructure with Mongo version 3.6, and are not observing these issues. &#160;Can you share if any changes with migration to 4.0.5 are causing this?&lt;/p&gt;</description>
                <environment>mongos: 3 servers (with 3 config servers)&lt;br/&gt;
mongod: 3 sharded replica sets, with each having one primary, two secondaries, and one arbiter&lt;br/&gt;
Mongo version: 4.0.5&lt;br/&gt;
Client Java Driver version: 3.10.1</environment>
        <key id="813593">SERVER-41904</key>
            <summary>Change Events: fullDocument field is unexpectedly NULL</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="4">Incomplete</resolution>
                                        <assignee username="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="vivek.nag">Vivek Nag Motamarri</reporter>
                        <labels>
                            <label>changestreams</label>
                    </labels>
                <created>Tue, 25 Jun 2019 13:55:46 +0000</created>
                <updated>Wed, 14 Jul 2021 00:11:14 +0000</updated>
                            <resolved>Wed, 4 Sep 2019 18:45:41 +0000</resolved>
                                    <version>4.0.5</version>
                                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2348889" author="daniel.hatcher" created="Mon, 29 Jul 2019 20:50:27 +0000"  >&lt;p&gt;Would it be possible to provide a full example of the code that reproduces the problem?&lt;/p&gt;</comment>
                            <comment id="2304738" author="daniel.hatcher" created="Fri, 28 Jun 2019 15:11:37 +0000"  >&lt;p&gt;I&apos;ve tried to reproduce what you&apos;re seeing but have been unsuccessful thus far. Could you provide a full example of the code that reproduces your problem? &lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="813686">JAVA-3333</issuekey>
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