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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-48480] Abort initial sync upon transition to REMOVED state</title>
                <link>https://jira.mongodb.org/browse/SERVER-48480</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;That would probably cause the initial sync attempt to fail eventually, but it might be worth writing something that checks for REMOVED state proactively and helps us fail quickly and gracefully.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1365982">SERVER-48480</key>
            <summary>Abort initial sync upon transition to REMOVED state</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="13201">Fixed</resolution>
                                        <assignee username="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 May 2020 20:53:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:39 +0000</updated>
                            <resolved>Wed, 10 Jun 2020 17:32:02 +0000</resolved>
                                                    <fixVersion>4.4.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3198009" author="xgen-internal-githook" created="Tue, 9 Jun 2020 19:50:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@10gen.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48480&quot; title=&quot;Abort initial sync upon transition to REMOVED state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48480&quot;&gt;&lt;del&gt;SERVER-48480&lt;/del&gt;&lt;/a&gt; Abort initial sync upon transition to REMOVED state&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ba63f264cc0be3bbc77e35ed94306c394ca95d9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ba63f264cc0be3bbc77e35ed94306c394ca95d9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3157998" author="judah.schvimer" created="Mon, 1 Jun 2020 21:43:25 +0000"  >&lt;p&gt;&lt;tt&gt;requiresGhostCommitTimestampForCatalogWrite&lt;/tt&gt; is used for deciding to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6ad955d35137efbc1dee40a346b195a54b860cd/src/mongo/db/catalog/index_timestamp_helper.cpp#L126&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ghost timestamp&lt;/a&gt; index build writes. One idea is to include &lt;tt&gt;REMOVED&lt;/tt&gt; in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6ad955d35137efbc1dee40a346b195a54b860cd/src/mongo/db/catalog/index_timestamp_helper.cpp#L109&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this check&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt; confirms this is not entirely safe. He does note that on 4.6+, &quot;It&#8217;s safe on master because single-phase builds only happen synchronously with replication and don&#8217;t use ghost timestamps any more. Single-phase = empty collection&quot;.&lt;/p&gt;

&lt;p&gt;So I think on 4.4 we need to abort initial sync on entering &lt;tt&gt;REMOVED&lt;/tt&gt;. On 4.6+ we just want to add &lt;tt&gt;REMOVED&lt;/tt&gt; to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6ad955d35137efbc1dee40a346b195a54b860cd/src/mongo/db/catalog/index_timestamp_helper.cpp#L109&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this check&lt;/a&gt; to relax the invariant.&lt;/p&gt;</comment>
                            <comment id="3152233" author="daniel.gottlieb@10gen.com" created="Mon, 1 Jun 2020 18:43:12 +0000"  >&lt;p&gt;Given &lt;tt&gt;REMOVED&lt;/tt&gt; can be ephemeral and not terminal, the choice of what to do is more interesting. The way I see it, the invariant is a tool. Writes that happen in a &lt;tt&gt;REMOVED&lt;/tt&gt; state has so far fallen entirely under replication&apos;s responsibility, so it&apos;s your call on whether you want to opt-in to that tool or not.&lt;/p&gt;</comment>
                            <comment id="3151798" author="judah.schvimer" created="Mon, 1 Jun 2020 18:33:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;, are you alright with relaxing the invariant? If we think that&apos;s safe that is preferable to aborting initial sync. &lt;tt&gt;REMOVED&lt;/tt&gt; can be a transient state if a subsequent reconfig adds a node back in, or if the transition into &lt;tt&gt;REMOVED&lt;/tt&gt; is due to a DNS error and nodes retry to find themselves in their config with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35649&quot; title=&quot;Nodes removed due to isSelf failure should re-attempt to find themselves&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35649&quot;&gt;&lt;del&gt;SERVER-35649&lt;/del&gt;&lt;/a&gt;. If it&apos;s transient, not having failed initial sync could safe a lot of time. &lt;/p&gt;

&lt;p&gt;We would only want to relax the invariant if timestamping in &lt;tt&gt;REMOVED&lt;/tt&gt; will occur correctly.&lt;/p&gt;</comment>
                            <comment id="3150871" author="daniel.gottlieb@10gen.com" created="Mon, 1 Jun 2020 18:12:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42497&quot; title=&quot;Detect/log unintentional untimestamped writes to catalog table&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42497&quot;&gt;&lt;del&gt;SERVER-42497&lt;/del&gt;&lt;/a&gt; is only in 4.4&lt;/p&gt;</comment>
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