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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-4766] Make initial sync restartable per collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-4766</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Be able to restart an initial sync node and it will only need to clone collections which haven&apos;t been completed.&lt;/p&gt;

&lt;p&gt;This will require ensuing that the oplog exists from the start of the cloning (from before the restart), and that no roll-back has occurred which would invalidate existing cloned data.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Old Description&lt;/b&gt;&lt;br/&gt;
Currently in initial sync, if the clone fails due to server crash or shutdown, we restart from scratch.  It seems like it ought to be possible to record progress as we go so that we can pick up from wherever we left off.  (For example, if the clone used the _id index and occasionally persisted the last written _id for each collection it visited, then it could pick up from the last _id seen.  Reasoning about the minvalid oplog entry would remain unchanged, I believe.)&lt;/p&gt;

&lt;p&gt;Operationally, this would make getting out of certain stuck cases less irritating for users, e.g., if a fresh node never goes from RECOVERING to SECONDARY for some reason, they could at least know that if they restart the process, we&apos;ll try our best to minimize subsequent recovery time, rather than starting over.&lt;/p&gt;</description>
                <environment></environment>
        <key id="29068">SERVER-4766</key>
            <summary>Make initial sync restartable per collection</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="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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="richard.kreuter">Richard Kreuter</reporter>
                        <labels>
                            <label>PM248</label>
                            <label>initialSync</label>
                    </labels>
                <created>Tue, 24 Jan 2012 23:18:19 +0000</created>
                <updated>Tue, 6 Dec 2022 05:37:29 +0000</updated>
                            <resolved>Wed, 20 Nov 2019 15:23:15 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>7</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2553737" author="steven.vannelli" created="Wed, 20 Nov 2019 15:23:15 +0000"  >&lt;p&gt;Closing this ticket out as the work for this project is captured within other tickets&lt;/p&gt;</comment>
                            <comment id="1256792" author="scotthernandez" created="Thu, 5 May 2016 18:02:08 +0000"  >&lt;p&gt;I expect that we will store a document per collection in a new &quot;local.replset.initialSyncProgress&quot; collection which looks something like this:&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ ns:&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;db.coll_name&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, documentCountAtStart:&lt;/span&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;###, start:{date:.., opTime:...}, end:{date:.., opTime:...}, elapsedTimeMS:{inserts:###, indexCommit:###, ...}}&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="28086">SERVER-4658</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="76185">SERVER-9752</issuekey>
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                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="69633">SERVER-9115</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="204915">SERVER-18521</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="259636">SERVER-22244</issuekey>
        </issuelink>
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