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            <title>[SERVER-84] when replicating capped collection, _id index is created at the target</title>
                <link>https://jira.mongodb.org/browse/SERVER-84</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Regardless of whether or not a source capped collection has an _id index, our replication code will create an _id index on the target collection to make op replay detection efficient.  As a consequence, insertion into the target collection could potentially be slower than insertion into the source collection, eventually causing the slave to become out of sync if there is a high frequency of writes to the master.  One way to resolve this would be to detect replays by verifying the _id of the newest element in the capped collection (the one which will precede the new object to be added if the new object described in the op is in fact added). &lt;/p&gt;</description>
                <environment></environment>
        <key id="10185">SERVER-84</key>
            <summary>when replicating capped collection, _id index is created at the target</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
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                <created>Mon, 1 Jun 2009 10:24:53 +0000</created>
                <updated>Fri, 7 Mar 2014 20:27:03 +0000</updated>
                            <resolved>Thu, 28 Oct 2010 17:17:01 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="19773" author="eliot" created="Thu, 28 Oct 2010 17:17:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2019&quot; title=&quot;_id index on capped collection : inconsistent between master and slave&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2019&quot;&gt;&lt;del&gt;SERVER-2019&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
the other has some updated information&lt;/p&gt;</comment>
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