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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-6825] Hard shutdown can leave replication in unrestartable state</title>
                <link>https://jira.mongodb.org/browse/SERVER-6825</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Leading to the member fatal asserting on restart.&lt;/p&gt;</description>
                <environment></environment>
        <key id="47860">SERVER-6825</key>
            <summary>Hard shutdown can leave replication in unrestartable state</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="kristina">Kristina Chodorow</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Aug 2012 16:40:57 +0000</created>
                <updated>Mon, 11 Jul 2016 17:56:08 +0000</updated>
                            <resolved>Wed, 22 Aug 2012 17:58:52 +0000</resolved>
                                                    <fixVersion>2.2.0-rc2</fixVersion>
                    <fixVersion>2.3.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="155821" author="auto" created="Wed, 22 Aug 2012 17:53:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-22T10:39:55-07:00&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6825&quot; title=&quot;Hard shutdown can leave replication in unrestartable state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6825&quot;&gt;&lt;del&gt;SERVER-6825&lt;/del&gt;&lt;/a&gt; convert updates to upserts on oplog application&lt;/p&gt;

&lt;p&gt;During initial sync, you must apply updates as updates and upserts as upserts,&lt;br/&gt;
since it is possible that an in-place update will move a document backwards and&lt;br/&gt;
cause the cloner to miss it.  We need to detect this situation on the secondary.&lt;/p&gt;

&lt;p&gt;However, during normal replication, we need all updates to be upserts.&lt;br/&gt;
Consider the situation where the oplog is replayed (possibly due to a server&lt;br/&gt;
crash).  If an update and subsequent delete are played and then replyed,&lt;br/&gt;
the reply will hit an error on the update because the document will not exist.&lt;br/&gt;
Converting the update to an upsert will allow oplog application to proceed;&lt;br/&gt;
while it may result in an incomplete document, this document will be deleted&lt;br/&gt;
soon afterward.&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/380b30c4843fb82e9cc378837e66b83567c16814&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/380b30c4843fb82e9cc378837e66b83567c16814&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="155819" author="auto" created="Wed, 22 Aug 2012 17:50:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-22T10:39:55-07:00&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6825&quot; title=&quot;Hard shutdown can leave replication in unrestartable state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6825&quot;&gt;&lt;del&gt;SERVER-6825&lt;/del&gt;&lt;/a&gt; convert updates to upserts on oplog application&lt;/p&gt;

&lt;p&gt;During initial sync, you must apply updates as updates and upserts as upserts,&lt;br/&gt;
since it is possible that an in-place update will move a document backwards and&lt;br/&gt;
cause the cloner to miss it.  We need to detect this situation on the secondary.&lt;/p&gt;

&lt;p&gt;However, during normal replication, we need all updates to be upserts.&lt;br/&gt;
Consider the situation where the oplog is replayed (possibly due to a server&lt;br/&gt;
crash).  If an update and subsequent delete are played and then replyed,&lt;br/&gt;
the reply will hit an error on the update because the document will not exist.&lt;br/&gt;
Converting the update to an upsert will allow oplog application to proceed;&lt;br/&gt;
while it may result in an incomplete document, this document will be deleted&lt;br/&gt;
soon afterward.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/38b899385691c1473dfd3964d026b0bdf8f77685&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/38b899385691c1473dfd3964d026b0bdf8f77685&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="155797" author="milkie" created="Wed, 22 Aug 2012 16:54:23 +0000"  >&lt;p&gt;If, in addition to minValid, we also had something like a maxValid value that showed how far we attempted to write operations (this would be updated when we begin a batch), we might then ignore update errors while replaying ops less than &quot;maxValid&quot;?&lt;/p&gt;</comment>
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            <issuekey id="54113">SERVER-7452</issuekey>
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