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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16449] Validate indexes early during initial sync</title>
                <link>https://jira.mongodb.org/browse/SERVER-16449</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Validate index definitions early in initial sync, otherwise If an invalid index is present (eg. field starts with &apos;$&apos;) this won&apos;t be discovered until much work has been done, which may include copying all the data for the database and applying parts of the oplog.&lt;/p&gt;</description>
                <environment></environment>
        <key id="173170">SERVER-16449</key>
            <summary>Validate indexes early during initial sync</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 Dec 2014 07:13:27 +0000</created>
                <updated>Tue, 6 Dec 2022 04:58:23 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="781434" author="kevin.pulo@10gen.com" created="Tue, 9 Dec 2014 01:04:16 +0000"  >&lt;p&gt;Yes, db.upgradeCheck() warns about these indexes.  However, it&apos;s only advisory &amp;#8212; if the replset is upgraded anyway (and it can be), then it will continue to function normally (until an initial sync fails in this way).&lt;/p&gt;

&lt;p&gt;You&apos;re correct that this is mostly about 2.4 -&amp;gt; 2.6, since these indexes can easily be made in 2.4 (and earlier), and are invalid in 2.6 (and later).  A backport to 2.6 would be very useful, however there is still value in having this fixed without a backport, since that would at least protect against the scenario of 2.4 -&amp;gt; 2.6 -&amp;gt; 2.8 in (relatively) rapid succession (i.e. without intervening initial syncs).&lt;/p&gt;

&lt;p&gt;There is also the issue of adding a 2.6/2.8 member to an otherwise 2.4 replset (e.g. for testing prior to upgrading).  Even though this isn&apos;t a great idea, it is possible and isn&apos;t great to have it fail after cloning.&lt;/p&gt;</comment>
                            <comment id="780764" author="milkie" created="Mon, 8 Dec 2014 15:47:54 +0000"  >&lt;p&gt;The upgradeChecker can be used to detect such indexes before upgrading to 2.6.  Is it correct that in order for this feature to be useful, it would be targeted at users who upgraded 2.4 to 2.6 without running the upgradeChecker?  We would have to backport this feature to the 2.6 series.&lt;/p&gt;</comment>
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