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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-19244] Secondary position information can be erroneous if nodes leave and rejoin a cluster with less data than before</title>
                <link>https://jira.mongodb.org/browse/SERVER-19244</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For example, say a node with member id 2 in the config crashes.  The data is restored from backup taken a day prior and restarted.  Now the node begins reporting upstream for id 2 a position that is behind where id 2 had previously reported.&lt;br/&gt;
Today&apos;s position managing code does not change a node&apos;s position if it is reported to have moved backward.&lt;/p&gt;

&lt;p&gt;This is a problem because nodes can thus appear to contain data that they do not actually have.&lt;/p&gt;</description>
                <environment></environment>
        <key id="214312">SERVER-19244</key>
            <summary>Secondary position information can be erroneous if nodes leave and rejoin a cluster with less data than before</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="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Jul 2015 18:18:08 +0000</created>
                <updated>Tue, 6 Dec 2022 04:48:55 +0000</updated>
                            <resolved>Mon, 11 Apr 2022 18:23:27 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2703959" author="milkie" created="Sat, 4 Jan 2020 14:51:05 +0000"  >&lt;p&gt;I&apos;m pretty sure this is still the case.  We can&apos;t move reported nodes&apos; positions backwards because it&apos;s possible for updatePosition messages from the same node to arrive out of order at a primary, if the messages take different paths through the spanning tree and the spanning tree changes during propagation of the messages.&lt;/p&gt;</comment>
                            <comment id="2703530" author="judah.schvimer" created="Fri, 3 Jan 2020 23:33:34 +0000"  >&lt;p&gt;I&apos;m not sure if this is still the case. This would also be a problem for a node that resyncs from a stale node. We will need to address this as part of initial sync semantics (PM-1096). Marking as blocked on that.&lt;/p&gt;</comment>
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