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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-22030] Abort if oplog is uncapped when starting in repl mode</title>
                <link>https://jira.mongodb.org/browse/SERVER-22030</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 3.0.7 (MMAPv1), oplog entries have been observed to be in non-monotonic order on secondaries where the oplog is not a capped collection.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20858&quot; title=&quot;Invariant failure in OplogStones for non-capped oplog creation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20858&quot;&gt;&lt;del&gt;SERVER-20858&lt;/del&gt;&lt;/a&gt; prevents non-capped oplogs from being created, however, this does not help if the system already has a non-capped oplog.  However, in versions where &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20858&quot; title=&quot;Invariant failure in OplogStones for non-capped oplog creation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20858&quot;&gt;&lt;del&gt;SERVER-20858&lt;/del&gt;&lt;/a&gt; isn&apos;t fixed, this is an easy situation to accidentally get into, eg. by following the &lt;a href=&quot;https://docs.mongodb.org/v3.0/tutorial/change-oplog-size/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oplog resize procedure&lt;/a&gt; but forgetting/missing the &lt;tt&gt;capped: true&lt;/tt&gt; parameter, or just forgetting/missing the createCollection step entirely (the next step will create the (uncapped) collection when the last oplog entry is inserted).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20912&quot; title=&quot;rs.initiate allows the creation of a non-capped oplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20912&quot;&gt;&lt;del&gt;SERVER-20912&lt;/del&gt;&lt;/a&gt; hints at a &quot;preflight check&quot;.  This ticket is to request that a startup warning be generated if --replSet is specified and a non-capped oplog is found.  It would also be good to have &lt;tt&gt;rs.printReplicationInfo()&lt;/tt&gt; print a warning if the oplog isn&apos;t capped.  Both warnings should direct the user to resize their oplog.&lt;/p&gt;</description>
                <environment></environment>
        <key id="245273">SERVER-22030</key>
            <summary>Abort if oplog is uncapped when starting in repl mode</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Dec 2015 05:51:34 +0000</created>
                <updated>Wed, 8 Feb 2017 21:45:58 +0000</updated>
                            <resolved>Thu, 19 May 2016 18:29:39 +0000</resolved>
                                    <version>3.0.7</version>
                                    <fixVersion>3.2.13</fixVersion>
                    <fixVersion>3.3.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1495470" author="xgen-internal-githook" created="Wed, 8 Feb 2017 21:44:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22030&quot; title=&quot;Abort if oplog is uncapped when starting in repl mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22030&quot;&gt;&lt;del&gt;SERVER-22030&lt;/del&gt;&lt;/a&gt; abort if oplog is uncapped when starting in repl mode&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4e7318bcb63eea1c0cbe453bede94d0e908b351c)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/05fb02461089988d244c49401d921473530b7a76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/05fb02461089988d244c49401d921473530b7a76&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1269210" author="milkie" created="Thu, 19 May 2016 18:30:27 +0000"  >&lt;p&gt;Note this only affects MMAP storage engine, which does not guarantee insertion order in non-capped collections.&lt;/p&gt;</comment>
                            <comment id="1269206" author="xgen-internal-githook" created="Thu, 19 May 2016 18:28:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22030&quot; title=&quot;Abort if oplog is uncapped when starting in repl mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22030&quot;&gt;&lt;del&gt;SERVER-22030&lt;/del&gt;&lt;/a&gt; abort if oplog is uncapped when starting in repl mode&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4e7318bcb63eea1c0cbe453bede94d0e908b351c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4e7318bcb63eea1c0cbe453bede94d0e908b351c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1266825" author="milkie" created="Tue, 17 May 2016 20:05:20 +0000"  >&lt;p&gt;Since version 3.0.9, in the 3.0 branch, users no longer have the ability to create an uncapped oplog (even implicitly).&lt;/p&gt;</comment>
                            <comment id="1124408" author="kevin.pulo@10gen.com" created="Thu, 31 Dec 2015 05:21:11 +0000"  >&lt;p&gt;I have been able to repro to confirm the impact &amp;#8212; an uncapped oplog, at least on 3.0.8 MMAPv1 secondaries, results in oplog entries that are out of order.  I wouldn&apos;t be surprised if the impact was wider (eg. perhaps also primaries, perhaps also WT, perhaps also 3.2/master), but it doesn&apos;t really matter because even this alone is bad enough.&lt;/p&gt;

&lt;p&gt;The repro I used was simple:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;mlaunch a 3.0.8 MMAPv1 3 member replset (1 arbiter), with --smallfiles.&lt;/li&gt;
	&lt;li&gt;Restart the secondary as a standalone on another port, save the last oplog entry, drop the oplog, and insert the saved entry (creating an uncapped oplog).  Restart back in the replset.&lt;/li&gt;
	&lt;li&gt;Load up the replset with this script:
&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;thead&gt;
			&lt;tr id=&quot;syntaxplugin_title&quot;&gt;
			&lt;td bgcolor=&quot;#f5f5f5&quot; style=&quot;font-family: Arial,sans-serif; color: #333; border-bottom: 1px solid #bbb; background-color: #f5f5f5 !important; font-weight: bold; line-height: 1em;&quot; &gt;
				&lt;p style=&quot;margin: 5px 10px; padding: 0;&quot;&gt;dumpdata&lt;/p&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/thead&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;#!/bin/bash&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;size=&quot;$1&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;dest=&quot;$2&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongo --port 27017 --eval &apos;size=&apos;&quot;$size&quot;&apos;; dest=&quot;&apos;&quot;$dest&quot;&apos;&quot;; payload = (new Array(size)).join(&quot; &quot;); c = db.getMongo().getCollection(dest); while(1) { for(i=0; i&amp;lt;1000; i++) { c.insert({payload: payload}); } c.drop() }&apos;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;And run several instances of it:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ ./dumpdata 200 a.a &amp;amp; ./dumpdata 20000 b.b &amp;amp; ./dumpdata 200 c.c &amp;amp; ./dumpdata 200 d.d &amp;amp; ./dumpdata 200 e.e &amp;amp; ./dumpdata 200 f.f &amp;amp;&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;/li&gt;
	&lt;li&gt;After a few minutes, use the following script on the secondary to observe out of order oplog entries:
&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;thead&gt;
			&lt;tr id=&quot;syntaxplugin_title&quot;&gt;
			&lt;td bgcolor=&quot;#f5f5f5&quot; style=&quot;font-family: Arial,sans-serif; color: #333; border-bottom: 1px solid #bbb; background-color: #f5f5f5 !important; font-weight: bold; line-height: 1em;&quot; &gt;
				&lt;p style=&quot;margin: 5px 10px; padding: 0;&quot;&gt;checkoplog&lt;/p&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/thead&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;#!/bin/bash&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;mongo --port 27018 --eval &apos;prev = null; db.getSiblingDB(&quot;local&quot;).oplog.rs.find({}, {ts:1}).hint({$natural:1}).forEach(function (x) { if (prev != null) { if ((x.ts.t &amp;lt; prev.ts.t) || (x.ts.t == prev.ts.t &amp;amp;&amp;amp; x.ts.i &amp;lt; prev.ts.i)) { print(&quot;PROBLEM: current ts &quot; + tojson(x.ts) + &quot; is &amp;lt;= prev ts &quot; + tojson(prev.ts)); } } prev = x; } )&apos;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ ./checkoplog&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;MongoDB shell version: 3.0.8&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;connecting to: 127.0.0.1:27018/test&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;PROBLEM: current ts Timestamp(1451530622, 16) is &amp;lt;= prev ts Timestamp(1451530623, 1277)&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;PROBLEM: current ts Timestamp(1451530622, 79) is &amp;lt;= prev ts Timestamp(1451530624, 653)&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;PROBLEM: current ts Timestamp(1451530622, 334) is &amp;lt;= prev ts Timestamp(1451530624, 26)&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;PROBLEM: current ts Timestamp(1451530622, 576) is &amp;lt;= prev ts Timestamp(1451530623, 4848)&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;PROBLEM: current ts Timestamp(1451530622, 1042) is &amp;lt;= prev ts Timestamp(1451530623, 3633)&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;PROBLEM: current ts Timestamp(1451530623, 498) is &amp;lt;= prev ts Timestamp(1451530623, 1709)&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;PROBLEM: current ts Timestamp(1451530623, 2889) is &amp;lt;= prev ts Timestamp(1451530623, 4432)&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;PROBLEM: current ts Timestamp(1451530624, 849) is &amp;lt;= prev ts Timestamp(1451530625, 462)&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;PROBLEM: current ts Timestamp(1451530624, 4366) is &amp;lt;= prev ts Timestamp(1451530625, 7)&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;PROBLEM: current ts Timestamp(1451530626, 873) is &amp;lt;= prev ts Timestamp(1451530626, 2252)&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;PROBLEM: current ts Timestamp(1451530627, 3764) is &amp;lt;= prev ts Timestamp(1451530628, 1932)&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;PROBLEM: current ts Timestamp(1451530629, 3682) is &amp;lt;= prev ts Timestamp(1451530630, 353)&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;PROBLEM: current ts Timestamp(1451530633, 1145) is &amp;lt;= prev ts Timestamp(1451530633, 1691)&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;PROBLEM: current ts Timestamp(1451530638, 577) is &amp;lt;= prev ts Timestamp(1451530638, 1891)&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;PROBLEM: current ts Timestamp(1451530643, 1403) is &amp;lt;= prev ts Timestamp(1451530643, 2563)&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;PROBLEM: current ts Timestamp(1451530650, 2834) is &amp;lt;= prev ts Timestamp(1451530650, 3241)&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;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="1124317" author="kevin.pulo@10gen.com" created="Wed, 30 Dec 2015 23:13:00 +0000"  >&lt;p&gt;Sure.  Since &quot;downgrading&quot; from a replset to a standalone isn&apos;t really a thing, there isn&apos;t really any possibility of a &quot;vestigial&quot; oplog.&lt;/p&gt;</comment>
                            <comment id="1124277" author="milkie" created="Wed, 30 Dec 2015 21:54:27 +0000"  >&lt;p&gt;I think it would be easiest if we simply refuse to start, in repl mode, if the oplog is not capped.  Not sure we need a warning for standalone mode, since a user&apos;s reason for starting in standalone mode is almost guaranteed to be because mongod is refusing to start in repl mode due to an uncapped oplog.&lt;/p&gt;</comment>
                            <comment id="1124270" author="kevin.pulo@10gen.com" created="Wed, 30 Dec 2015 21:41:57 +0000"  >&lt;p&gt;Refusing to start would be fine, as long as it&apos;s only when replication (or master/slave) is enabled.  Refusing to start irrespective of supplied options is not okay, because it could effectively lock people out of their instance without any way of fixing the problem that&apos;s stopping the server from starting (ala &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21378&quot; title=&quot;Add a setParameter that will bypass auth metadata startup validation checks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21378&quot;&gt;&lt;del&gt;SERVER-21378&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;In the absence &lt;tt&gt;&amp;#45;&amp;#45;master&lt;/tt&gt;, &lt;tt&gt;--replSet&lt;/tt&gt; or &lt;tt&gt;replication.replSetName&lt;/tt&gt;, I guess a startup warning would be most appropriate.  Though I could probably be talked out of that (ie. no change from the current behaviour).&lt;/p&gt;</comment>
                            <comment id="1124208" author="milkie" created="Wed, 30 Dec 2015 19:58:00 +0000"  >&lt;p&gt;Should it be a warning, or simply refuse to start if the oplog isn&apos;t capped?&lt;/p&gt;</comment>
                    </comments>
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