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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-22247] Parsing old config.collection documents fails because of missing &apos;lastmodEpoch&apos; field</title>
                <link>https://jira.mongodb.org/browse/SERVER-22247</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &apos;lastmodEpoch&apos; field in the collection document specifies the collection&apos;s creation epoch. It is used to differentiate requests for the same collection name in the cases where the collection was dropped and immediately recreated.&lt;/p&gt;

&lt;p&gt;This field was introduced in version 2.2, so collection metadata from earlier versions will not have it. Upgrades do not add this field, so 3.2 mongos reading such legacy metadata will start failing with the following error:&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;error while parsing config.collections document: { _id: &quot;dbname.collname&quot;, lastmod: new Date(1369013796), dropped: true } : NoSuchKey Missing expected field &quot;lastmodEpoch&quot;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;We should make &apos;lastmodEpoch&apos; an optional field during &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v3.2/src/mongo/s/catalog/type_collection.cpp#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;collection metadata parsing&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="259703">SERVER-22247</key>
            <summary>Parsing old config.collection documents fails because of missing &apos;lastmodEpoch&apos; field</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>code-and-test</label>
                    </labels>
                <created>Wed, 20 Jan 2016 18:46:26 +0000</created>
                <updated>Wed, 23 Nov 2016 14:58:38 +0000</updated>
                            <resolved>Thu, 21 Jan 2016 19:02:06 +0000</resolved>
                                    <version>3.2.1</version>
                    <version>3.3.0</version>
                                    <fixVersion>3.2.3</fixVersion>
                    <fixVersion>3.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1150647" author="xgen-internal-githook" created="Thu, 21 Jan 2016 22:50:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22247&quot; title=&quot;Parsing old config.collection documents fails because of missing &amp;#39;lastmodEpoch&amp;#39; field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22247&quot;&gt;&lt;del&gt;SERVER-22247&lt;/del&gt;&lt;/a&gt; Fix clang compile error&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a06749d784cef76d1b090449927a579bc8f1191b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a06749d784cef76d1b090449927a579bc8f1191b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1150645" author="xgen-internal-githook" created="Thu, 21 Jan 2016 22:49:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22247&quot; title=&quot;Parsing old config.collection documents fails because of missing &amp;#39;lastmodEpoch&amp;#39; field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22247&quot;&gt;&lt;del&gt;SERVER-22247&lt;/del&gt;&lt;/a&gt; Fix clang compile error&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ab315e0b2a2b7d15e1aad8632ab64a5a9409215f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ab315e0b2a2b7d15e1aad8632ab64a5a9409215f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1150296" author="xgen-internal-githook" created="Thu, 21 Jan 2016 19:03:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22247&quot; title=&quot;Parsing old config.collection documents fails because of missing &amp;#39;lastmodEpoch&amp;#39; field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22247&quot;&gt;&lt;del&gt;SERVER-22247&lt;/del&gt;&lt;/a&gt; Do not fail when parsing pre-2.2 sharding collection metadata&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/040efca71bd822b7ad3b0fb5149e6a5bd04ecb16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/040efca71bd822b7ad3b0fb5149e6a5bd04ecb16&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1150284" author="xgen-internal-githook" created="Thu, 21 Jan 2016 18:59:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22247&quot; title=&quot;Parsing old config.collection documents fails because of missing &amp;#39;lastmodEpoch&amp;#39; field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22247&quot;&gt;&lt;del&gt;SERVER-22247&lt;/del&gt;&lt;/a&gt; Do not fail when parsing pre-2.2 sharding collection metadata&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cdbcef1a5f509a0677b0bdc6a74be1c82d39b9e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cdbcef1a5f509a0677b0bdc6a74be1c82d39b9e2&lt;/a&gt;&lt;/p&gt;</comment>
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