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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>[DOCS-10808] Update oplog resizing instructions in advance of 3.6</title>
                <link>https://jira.mongodb.org/browse/DOCS-10808</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;If you follow the oplog resizing directions in the docs (&lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/change-oplog-size/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/tutorial/change-oplog-size/&lt;/a&gt;) for a 3.5.13 mmapv1 replica set, secondaries get into an error state when they are re-added to the replica set : &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;
		&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;   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;2017-09-19T14:01:17.567-0400 E REPL     [rsBackgroundSync] sync producer problem: Location40414: BSON field &apos;OplogEntryBase.op&apos; is missing but a required field&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;Note : The procedure in the docs works fine on 3.4.9. &lt;/p&gt;

&lt;p&gt;Not sure if this is just a change that needs to be made to the docs for 3.6, or a problem from 3.6 changes. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; suggested I assign this to replication, but feel free to reassign. &lt;/p&gt;</description>
                <environment></environment>
        <key id="429404">DOCS-10808</key>
            <summary>Update oplog resizing instructions in advance of 3.6</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="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="louisa.berger@mongodb.com">Louisa Berger</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Sep 2017 18:31:15 +0000</created>
                <updated>Mon, 30 Oct 2023 21:06:35 +0000</updated>
                            <resolved>Thu, 9 Nov 2017 20:15:04 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1721919" author="xgen-internal-githook" created="Thu, 9 Nov 2017 20:07:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;, &apos;email&apos;: &apos;kevin.albertson@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-10808&quot; title=&quot;Update oplog resizing instructions in advance of 3.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-10808&quot;&gt;&lt;del&gt;DOCS-10808&lt;/del&gt;&lt;/a&gt; fix oplog resize instructions on mmap&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/44b21c3f70e1fc41f5ea3584d168e8c86f40b8de&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/44b21c3f70e1fc41f5ea3584d168e8c86f40b8de&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1677696" author="spencer" created="Wed, 20 Sep 2017 15:48:24 +0000"  >&lt;p&gt;I think this approach should work for all mongodb versions, not just 3.6.&lt;/p&gt;</comment>
                            <comment id="1677694" author="spencer" created="Wed, 20 Sep 2017 15:47:33 +0000"  >&lt;p&gt;Okay, I figured out why it was written the way it was.  The problem is that oplog entries can contain update modifiers (like $set), but you can&apos;t actually store documents into collections with field names that start with a dollar sign.  So I think the thing to do is grab the whole oplog entry, then clear out the &apos;o&apos; and &apos;o2&apos; fields before storing it.  So where the docs currently say:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.temp.save( db.oplog.rs.find( { }, { ts: 1, h: 1 } ).sort( {$natural : -1} ).limit(1).next() )&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Change to &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;
		&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;var oplogEntry = db.oplog.rs.find().sort({$natural: -1}).limit(1).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;oplogEntry.op = &apos;n&apos;; // Change the entry to a no-op&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;oplogEntry.o = {}; // Remove any update modifiers that would prevent saving the oplog entry to a normal collection.&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;oplogEntry.o2 = {};&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;db.temp.save(oplogEntry);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1677663" author="louisa.berger@10gen.com" created="Wed, 20 Sep 2017 15:36:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt; &amp;#8211; is this what you&apos;d recommend for all mongodb versions, or just 3.6? &lt;/p&gt;</comment>
                            <comment id="1676871" author="milkie" created="Tue, 19 Sep 2017 19:00:09 +0000"  >&lt;p&gt;Note this will also affect anyone who has scripts that copy oplog entries for this purpose.&lt;/p&gt;</comment>
                            <comment id="1676870" author="spencer" created="Tue, 19 Sep 2017 18:59:33 +0000"  >&lt;p&gt;I have converted this into a documentation request.  The problem with the existing documented procedure is that when saving the seed oplog document to the new oplog we only save the &apos;ts&apos; and &apos;h&apos; fields, but we need to save the entire oplog entry.&lt;/p&gt;</comment>
                            <comment id="1676857" author="milkie" created="Tue, 19 Sep 2017 18:45:08 +0000"  >&lt;p&gt;Also I suspect that you would get this error for any storage engine, although there is no longer a need to do this procedure for WiredTiger now that we have online oplog resizing there.&lt;/p&gt;</comment>
                            <comment id="1676856" author="milkie" created="Tue, 19 Sep 2017 18:43:32 +0000"  >&lt;p&gt;My initial research suggests that this behavior changed when we converted oplog entry into an IDL.  It may be that we want to keep this behavior; however, we&apos;ll have to change documentation, and it will be a backwards-breaking change for those users who have been following the old directions.&lt;/p&gt;</comment>
                    </comments>
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