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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-6981] maxPasses assertion (on allocation failure) can make capped collection unreadable</title>
                <link>https://jira.mongodb.org/browse/SERVER-6981</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The maxPasses assertion (triggered on repeated allocation failure from a capped collection) can leave capped collection in non iterable state.  In particular&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the capExtent extent can be empty (contain no documents)&lt;/li&gt;
	&lt;li&gt;it&apos;s possible to have capExtent non null and capFirstNewRecord null, in which case the capped cursors will not work properly&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Should also investigate when the maxPasses assertion can be triggered.&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;            if( ++passes &amp;gt; maxPasses ) {&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;                log() &amp;lt;&amp;lt; &quot;passes ns:&quot; &amp;lt;&amp;lt; ns &amp;lt;&amp;lt; &quot; len:&quot; &amp;lt;&amp;lt; len &amp;lt;&amp;lt; &quot; maxPasses: &quot; &amp;lt;&amp;lt; maxPasses &amp;lt;&amp;lt; &apos;\n&apos;;&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;                log() &amp;lt;&amp;lt; &quot;passes max:&quot; &amp;lt;&amp;lt; maxCappedDocs() &amp;lt;&amp;lt; &quot; nrecords:&quot; &amp;lt;&amp;lt; stats.nrecords &amp;lt;&amp;lt; &quot; datasize: &quot; &amp;lt;&amp;lt; stats.datasize &amp;lt;&amp;lt; endl;&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;                massert( 10345 ,  &quot;passes &amp;gt;= maxPasses in capped collection alloc&quot;, false );&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;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="50003">SERVER-6981</key>
            <summary>maxPasses assertion (on allocation failure) can make capped collection unreadable</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Sun, 9 Sep 2012 18:21:24 +0000</created>
                <updated>Mon, 3 Dec 2018 11:02:24 +0000</updated>
                            <resolved>Mon, 8 Dec 2014 22:37:12 +0000</resolved>
                                                    <fixVersion>2.8.0-rc3</fixVersion>
                                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="2078123" author="dffrench" created="Mon, 3 Dec 2018 11:02:24 +0000"  >&lt;p&gt;My apologies Eric and thank you for the quick response. I have created a post on the mongodb-user group here. &lt;a href=&quot;https://groups.google.com/forum/#!topic/mongodb-user/bABNI7te1J0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!topic/mongodb-user/bABNI7te1J0&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="2074451" author="milkie" created="Wed, 28 Nov 2018 19:43:21 +0000"  >&lt;p&gt;Hi David, I don&apos;t think your question is related to this ticket.  The SERVER project in general is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-user group.  Thank you!&lt;/p&gt;</comment>
                            <comment id="2074398" author="dffrench" created="Wed, 28 Nov 2018 19:29:09 +0000"  >&lt;p&gt;Apologies, I know this issue hasn&apos;t been updated in quite some time but I am hoping someone will be able to provide an answer for me.&lt;/p&gt;

&lt;p&gt;In a scenario with a replica set, do you know if having a write concern &amp;gt; 1 will ensure the operation has been successful on the secondaries?&lt;/p&gt;</comment>
                            <comment id="1020895" author="jblackburn" created="Wed, 2 Sep 2015 17:53:12 +0000"  >&lt;p&gt;I think this data-loss bug can affect the operation log, which means that MongoDB will randomly fail to replicate documents to secondaries.  However it successfully writes the document to the primary!  It appears this would particularly affect the oplog due to the unconstrained nature of the write workload to this collection.&lt;/p&gt;

&lt;p&gt;As far as I can see this issue exists in the latest 2.4.x and 2.6.x stable branches:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/v2.4/src/mongo/db/cap.cpp#L276&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v2.4/src/mongo/db/cap.cpp#L276&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/v2.6/src/mongo/db/structure/catalog/cap.cpp#L295&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v2.6/src/mongo/db/structure/catalog/cap.cpp#L295&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This is likely the root cause of the sporadic, and persistent, data loss bugs we&apos;ve encountered  in 2.2.x and 2.4.x  CS-23187 CS-8955&lt;/p&gt;</comment>
                            <comment id="780861" author="xgen-internal-githook" created="Mon, 8 Dec 2014 16:53:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6981&quot; title=&quot;maxPasses assertion (on allocation failure) can make capped collection unreadable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6981&quot;&gt;&lt;del&gt;SERVER-6981&lt;/del&gt;&lt;/a&gt; Remove maxPasses limit and unify capped no-space errors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/545b4f727d2b74f1a50034cf63f22911a2dd0962&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/545b4f727d2b74f1a50034cf63f22911a2dd0962&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="158358">SERVER-15265</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="158885">SERVER-15303</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="66076">SERVER-8666</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="136151">SERVER-13914</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="101970">SERVER-12058</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="189091">SERVER-17561</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10220">
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                                                        </outwardlinks>
                                                        </issuelinktype>
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