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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-14401] Behaviour of replication, and reading from secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-14401</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I would like to understand the behaviour of writes as they are replicated across to secondaries to confirm or debunk my understanding.&lt;/p&gt;

&lt;p&gt;In our situation we write batches of individual documents in what we call a snapshot, related by a field in each containing the snapshot id.  When we have completed writing a batch (20k+) of documents, we &apos;close&apos; the snapshot by updating an additional snapshot document, which contains meta data about when, by whom, and the state of the snapshot.  At that point no more documents can be written into that snapshot.  None of the documents that make up the snapshot can be mutated at any point.&lt;/p&gt;

&lt;p&gt;Am I correct in thinking that all writes to the primary are replayed in exactly the same order to the secondary, from the oplog.  If this statement holds true, I can then assume that once i &apos;see&apos; that snapshot as &apos;closed&apos; in the secondary, I can be sure that all the documents have also been replicated to the secondary.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="144785">SERVER-14401</key>
            <summary>Behaviour of replication, and reading from secondaries</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="-1">Unassigned</assignee>
                                    <reporter username="sj">simon</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Jul 2014 08:46:19 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:04 +0000</updated>
                            <resolved>Tue, 1 Jul 2014 18:26:26 +0000</resolved>
                                    <version>2.4.6</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="640881" author="thomasr" created="Tue, 1 Jul 2014 18:26:26 +0000"  >&lt;p&gt;Hi Simon,&lt;/p&gt;

&lt;p&gt;The SERVER project is for reporting bugs or feature suggestions for the MongoDB server. &lt;/p&gt;

&lt;p&gt;For MongoDB-related support discussion please post on the mongodb-users group (&lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user&lt;/a&gt;) or Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag. A question like this involving more discussion would be best posted on the mongodb-users group. &lt;/p&gt;

&lt;p&gt;I&apos;m closing this and your previous question, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14392&quot; title=&quot;Replica set step down behaviour for data not replicated.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14392&quot;&gt;&lt;del&gt;SERVER-14392&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="640432" author="sj" created="Tue, 1 Jul 2014 12:48:39 +0000"  >&lt;p&gt;Kunal pointed me to a video (&lt;a href=&quot;http://www.mongodb.com/presentations/replication-internals-life-write-0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.com/presentations/replication-internals-life-write-0&lt;/a&gt;) that explains what I was wanting to understand.  Could you please confirm that the &apos;replaying&apos; of changes are played in order on secondaries in 2.4.6.  Thanks, Simon&lt;/p&gt;</comment>
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