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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-22766] Dynamic oplog sizing for WiredTiger nodes</title>
                <link>https://jira.mongodb.org/browse/SERVER-22766</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Proposed title: Dynamic oplog sizing of replica set&lt;/p&gt;

&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Jul 10, 2017&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;FEATURE DESCRIPTION&lt;/b&gt;&lt;br/&gt;
This new feature enables the dynamic resizing of a node&apos;s &lt;a href=&quot;https://docs.mongodb.com/manual/core/replica-set-oplog/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oplog&lt;/a&gt;, allowing users to &lt;em&gt;grow&lt;/em&gt; and &lt;em&gt;shrink&lt;/em&gt; the oplog to satisfy the operational needs of each node in a replica set.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;VERSIONS&lt;/b&gt;&lt;br/&gt;
This feature is available in the 3.5.10 and newer development versions of MongoDB, and in the 3.6 and newer production releases.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RATIONALE&lt;/b&gt;&lt;br/&gt;
In a MongoDB replica set, the oplog is a special capped collection used to replicate data to other nodes. Users may specify the size of the oplog for each node when &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/deploy-replica-set/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;deploying a replica set&lt;/a&gt;, but &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;altering that size required maintenance&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This new feature bypasses the need for maintance and allows users to dynamically change the size of the oplog &lt;b&gt;in MongoDB nodes running with the WiredTiger storage engine only&lt;/b&gt; (nodes running the MMAPv1 storage engine still need to follow the maintenance procedure linked above).&lt;/p&gt;


&lt;p&gt;&lt;b&gt;OPERATION&lt;/b&gt;&lt;br/&gt;
To display the size of the oplog, one can use the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.collection.stats/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;stats()&lt;/tt&gt; command&lt;/a&gt;. Here&apos;s a replica set primary node with a 9.1GB oplog:&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;replset:PRIMARY&amp;gt; use local&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;replset:PRIMARY&amp;gt; db.oplog.rs.stats()&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;{&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;        &quot;ns&quot; : &quot;local.oplog.rs&quot;,&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;        &quot;size&quot; : 6781,&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;        &quot;count&quot; : 60,&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;        &quot;avgObjSize&quot; : 113,&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;        &quot;storageSize&quot; : 36864,&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;        &quot;capped&quot; : true,&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;        &quot;max&quot; : -1,&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;        &quot;maxSize&quot; : NumberLong(&quot;9790804377&quot;),&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;        ...&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;}&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;The size of the oplog is displayed at deployment time in the logs as follows:&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;2017-07-17T17:47:11.870-0400 I REPL     [replication-0] creating replication oplog of size: 9337MB...&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;Users can change the size of the oplog with the &lt;tt&gt;replSetResizeOplog&lt;/tt&gt; command, specifying a &lt;b&gt;size in MB&lt;/b&gt;. For example:&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;replset:PRIMARY&amp;gt; use admin&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;replset:PRIMARY&amp;gt; db.runCommand({replSetResizeOplog:1, size: 16384})&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;{ &quot;ok&quot; : 1, &quot;operationTime&quot; : Timestamp(1500329291, 1) }&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;The command above changes the oplog size to 16384 MB (16GB/17179869184 bytes). This operation is recorded in the logs as follows:&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;2017-07-17T17:52:40.396-0400 I STORAGE  [conn11] replSetResizeOplog success, currentSize:17179869184&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;The output of the &lt;tt&gt;stats()&lt;/tt&gt; command also reflects the change:&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;replset:PRIMARY&amp;gt; use local&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;replset:PRIMARY&amp;gt; db.oplog.rs.stats()&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;{&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;        &quot;ns&quot; : &quot;local.oplog.rs&quot;,&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;        &quot;size&quot; : 6781,&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;        &quot;count&quot; : 60,&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;        &quot;avgObjSize&quot; : 113,&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;        &quot;storageSize&quot; : 36864,&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;
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&lt;p/&gt;

&lt;p&gt;&lt;b&gt;ADDITIONAL NOTES&lt;/b&gt;&lt;br/&gt;
Reducing the size of the oplog removes data from it. Reducing the size of the oplog in a given node may cause any members of a replica set syncing from that node to become stale and need a &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/resync-replica-set-member/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;resync&lt;/a&gt;.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;It would be very, very handy to have a method to alter the oplog size for an entire replicaset at the same time. That is, issue a command on the primary, it expands its oplog size, and the changes trickle down to the replicas.&lt;/p&gt;

&lt;p&gt;Better yet would be a dynamic oplog where it doesn&apos;t need to be a specific size. Capped collections have advantages, I understand, but perhaps there are ways around limitations of uncapped ones for oplog purposes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="266840">SERVER-22766</key>
            <summary>Dynamic oplog sizing for WiredTiger nodes</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="shakir.sadikali@mongodb.com">Shakir Sadikali</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Feb 2016 18:41:53 +0000</created>
                <updated>Wed, 23 Oct 2019 17:48:46 +0000</updated>
                            <resolved>Wed, 5 Jul 2017 21:48:32 +0000</resolved>
                                                    <fixVersion>3.4.19</fixVersion>
                    <fixVersion>3.5.10</fixVersion>
                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>22</watches>
                                                                                                                <comments>
                            <comment id="2083744" author="xgen-internal-githook" created="Fri, 7 Dec 2018 13:27:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;wolfkdy&apos;, &apos;email&apos;: &apos;kdy71107216@aliyun.com&apos;, &apos;username&apos;: &apos;wolfkdy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22766&quot; title=&quot;Dynamic oplog sizing for WiredTiger nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22766&quot;&gt;&lt;del&gt;SERVER-22766&lt;/del&gt;&lt;/a&gt; wiredtiger engine support update oplogsize online&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 93beb0234eba9dc58ab6070ad472022f96e019e6)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0802b5f4033e481cc3c2830d6f14a3fdd5b3ffcd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0802b5f4033e481cc3c2830d6f14a3fdd5b3ffcd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1614658" author="xgen-internal-githook" created="Wed, 5 Jul 2017 21:46:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;wolfkdy&apos;, u&apos;name&apos;: u&apos;wolfkdy&apos;, u&apos;email&apos;: u&apos;kdy71107216@aliyun.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22766&quot; title=&quot;Dynamic oplog sizing for WiredTiger nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22766&quot;&gt;&lt;del&gt;SERVER-22766&lt;/del&gt;&lt;/a&gt; wiredtiger engine support update oplogsize online&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/93beb0234eba9dc58ab6070ad472022f96e019e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/93beb0234eba9dc58ab6070ad472022f96e019e6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1591077" author="geert.bosch" created="Thu, 8 Jun 2017 15:49:58 +0000"  >&lt;p&gt;We&apos;ll be merging your change soon&lt;/p&gt;</comment>
                            <comment id="1580559" author="wolf_kdy" created="Fri, 26 May 2017 02:06:09 +0000"  >&lt;p&gt;Would you please take some time to review my last commit, thanks!&lt;/p&gt;</comment>
                            <comment id="1572890" author="wolf_kdy" created="Wed, 17 May 2017 00:04:29 +0000"  >&lt;p&gt;@Geert Bosch&lt;br/&gt;
Thanks for taking time.&lt;br/&gt;
I&apos;ve read your comments and taken your suggestions.&lt;br/&gt;
You may take a look at my latest changes.&lt;br/&gt;
Hoping for your reply&lt;/p&gt;</comment>
                            <comment id="1572107" author="wolf_kdy" created="Tue, 16 May 2017 12:52:19 +0000"  >&lt;p&gt;I refined my code, to update codes below:&lt;/p&gt;

&lt;p&gt;use checkAuthForCommand instead of addRequiredPrivileges&lt;br/&gt;
merge from upstream/master, resolve conflicts, use new api to get collection&lt;br/&gt;
do a fully new compile with no errors and check everything works ok.&lt;br/&gt;
I think it is the right time to merge the code. If time lasts longer, new conflicts will appear.&lt;br/&gt;
Hoping for your reply!&lt;/p&gt;</comment>
                            <comment id="1571254" author="wolf_kdy" created="Mon, 15 May 2017 15:42:32 +0000"  >&lt;p&gt;Happy Monday!&lt;br/&gt;
I&apos;m here again.&lt;br/&gt;
Ask the old question.&lt;br/&gt;
Do you have further plans about this issue and my pr?&lt;br/&gt;
Hoping for your reply!&lt;/p&gt;</comment>
                            <comment id="1568717" author="wolf_kdy" created="Thu, 11 May 2017 03:43:51 +0000"  >&lt;p&gt;I&apos;ve carefully read @Spencer T Brody&apos;s review comments, optimized my code and updated the pull request.&lt;/p&gt;</comment>
                            <comment id="1561036" author="wolf_kdy" created="Sun, 30 Apr 2017 16:13:02 +0000"  >&lt;p&gt;I&#8216;ve carefully read @Geert Bosch&apos;s review comments, optimized my code and updated the pull request.&lt;/p&gt;</comment>
                            <comment id="1516387" author="wolf_kdy" created="Mon, 6 Mar 2017 02:29:27 +0000"  >&lt;p&gt;I did not pass &#8220;resizeOplog&#8221; through the replication subsystem since oplogSize should be metadata of a single mongod rather than a repl-set.&lt;/p&gt;</comment>
                            <comment id="1516083" author="ramon.fernandez" created="Sat, 4 Mar 2017 15:15:48 +0000"  >&lt;p&gt;Thanks for taking the time to create a pull request &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=wolf_kdy&quot; class=&quot;user-hover&quot; rel=&quot;wolf_kdy&quot;&gt;wolf_kdy&lt;/a&gt;, we&apos;ll take a look and get back to you.&lt;/p&gt;</comment>
                            <comment id="1516044" author="wolf_kdy" created="Sat, 4 Mar 2017 08:52:05 +0000"  >&lt;p&gt;Hi, I devoted a pull request to solve this issue.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/pull/1138&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pull request&lt;/a&gt;&lt;br/&gt;
I have signed the contribution agreement, changed and passed related unittests.&lt;br/&gt;
Intergration-tests are also made to ensure the correctness under high pressure.&lt;br/&gt;
The two bug issues devoted last year by me can be a proof that I&apos;m experienced in mongodb sourcecode. So plz take a serious look into the pull request.&lt;br/&gt;
Hoping for your reply, thanks!&lt;/p&gt;</comment>
                    </comments>
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