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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-4439] Replica set members shouldn&apos;t sync from a node that is very behind</title>
                <link>https://jira.mongodb.org/browse/SERVER-4439</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In initial and &quot;normal&quot; sync.&lt;/p&gt;</description>
                <environment></environment>
        <key id="26063">SERVER-4439</key>
            <summary>Replica set members shouldn&apos;t sync from a node that is very behind</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Dec 2011 06:34:38 +0000</created>
                <updated>Tue, 27 Oct 2015 14:29:42 +0000</updated>
                            <resolved>Fri, 15 Jun 2012 19:01:37 +0000</resolved>
                                                    <fixVersion>2.1.2</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="133422" author="ian@10gen.com" created="Fri, 15 Jun 2012 19:01:37 +0000"  >&lt;p&gt;Bulk of the work is done, new ticket created and linked to represent improvements to testing that must be made.&lt;/p&gt;</comment>
                            <comment id="123261" author="auto" created="Fri, 25 May 2012 20:27:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4439&quot; title=&quot;Replica set members shouldn&amp;#39;t sync from a node that is very behind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4439&quot;&gt;&lt;del&gt;SERVER-4439&lt;/del&gt;&lt;/a&gt; don&apos;t sync from a node that is more than 10 minutes behind the primary&lt;/p&gt;

&lt;p&gt;This only affects choosing a sync target; if a target eventually falls 10 minutes behind,&lt;br/&gt;
a different target is not then chosen.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ec0ca41bdc2a80454fb7d89d4e40d6d7479b769a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ec0ca41bdc2a80454fb7d89d4e40d6d7479b769a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="107467" author="robert.dibetta@autodesk.com" created="Fri, 6 Apr 2012 21:22:40 +0000"  >&lt;p&gt;Hello,&lt;br/&gt;
  Can this fix be backported into a 2.0.x release ?&lt;/p&gt;

&lt;p&gt;thanks much !&lt;br/&gt;
  Bob DiBetta&lt;/p&gt;</comment>
                            <comment id="107123" author="geoff.gallaway" created="Thu, 5 Apr 2012 20:01:37 +0000"  >&lt;p&gt;I&apos;d like this to be tunable somehow. 10 minute-stale data is ancient if you have code making business decisions (routing, stats, etc) on that data. This is especially true since the times when the replication delay is the most harmful (traffic spikes, etc) are the times when secondaries are likely to fall behind. 1 minute would be more comfortable but may cause too many reconnections and flapping.&lt;/p&gt;

&lt;p&gt;I&apos;d assume this will make sure there is a secondary that is more up to date and reconnect to that secondary rather than randomly bouncing around looking for a more up-to-date secondary?&lt;/p&gt;</comment>
                            <comment id="71152" author="eliot" created="Tue, 6 Dec 2011 15:19:17 +0000"  >&lt;p&gt;I think 10 minutes is a good starting point.&lt;/p&gt;</comment>
                            <comment id="71150" author="kristina" created="Tue, 6 Dec 2011 15:15:47 +0000"  >&lt;p&gt;How far behind should be allowed?  1 minute? 10?  How should that be balanced with trying to clone from the nearest member?  &lt;/p&gt;

&lt;p&gt;I assume that this should be adjusted for a syncDelay node. &lt;/p&gt;

&lt;p&gt;And I&apos;m assuming, if there&apos;s no primary, it&apos;ll just clone from whomever.&lt;/p&gt;</comment>
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            <issuekey id="28151">SERVER-4664</issuekey>
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            <issuekey id="35041">SERVER-5454</issuekey>
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            <issuelink>
            <issuekey id="41425">SERVER-6106</issuekey>
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            <issuekey id="32513">DOCS-154</issuekey>
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            <issuekey id="29000">SERVER-4750</issuekey>
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