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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-61482] Updates to config.reshardingOperations wait for PrimaryOnlyService to be rebuilt while holding oplog slot, stalling replication on config server indefinitely</title>
                <link>https://jira.mongodb.org/browse/SERVER-61482</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b4517954a706b9f49b17d423f179113aa8632565/src/mongo/db/repl/primary_only_service.cpp#L366-L376&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;PrimaryOnlyService::onStepUp() waits for &lt;tt&gt;stepUpOpTime&lt;/tt&gt; to become majority&amp;#45;committed before attempting to rebuild any Instances&lt;/a&gt;. New optimes becoming majority&amp;#45;committed depend on the ability for secondaries to successfully read new entries from a forward&amp;#45;scanning oplog cursor, which in turn depend on there not being any outstanding storage transactions with oplog slots still reserved (aka a hole in the oplog).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b4517954a706b9f49b17d423f179113aa8632565/src/mongo/db/s/resharding/resharding_op_observer.cpp#L222&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ReshardingOpObserver::onUpdate() attempts to get the ReshardingCoordinator and its associated ReshardingCoordinatorObserver&lt;/a&gt; to update their in&amp;#45;memory states. Doing so must &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b4517954a706b9f49b17d423f179113aa8632565/src/mongo/db/repl/primary_only_service.cpp#L550-L551&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wait until the ReshardingCoordinatorService has finished rebuilding&lt;/a&gt;. However, ReshardingOpObserver::onUpdate() currently waits for the ReshardingCoordinatorService to have finished rebuilding with its storage transaction still active and after having acquired an oplog slot for the update to config.reshardingOperations. If the ReshardingCoordinatorService wasn&apos;t already rebuilt before the update to the config.reshardingOperations collection came in from the donor or recipient shard, then it won&apos;t ever finish rebuilding. Nor will replication on the config server be able to make progress with the oplog hole present.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1925319">SERVER-61482</key>
            <summary>Updates to config.reshardingOperations wait for PrimaryOnlyService to be rebuilt while holding oplog slot, stalling replication on config server indefinitely</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>sharding-nyc-subteam1</label>
                    </labels>
                <created>Mon, 15 Nov 2021 15:28:16 +0000</created>
                <updated>Sun, 29 Oct 2023 21:46:02 +0000</updated>
                            <resolved>Wed, 17 Nov 2021 12:39:40 +0000</resolved>
                                    <version>5.0.0</version>
                    <version>5.1.0</version>
                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.0.5</fixVersion>
                    <fixVersion>5.1.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4194108" author="xgen-internal-githook" created="Wed, 17 Nov 2021 03:51:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61482&quot; title=&quot;Updates to config.reshardingOperations wait for PrimaryOnlyService to be rebuilt while holding oplog slot, stalling replication on config server indefinitely&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61482&quot;&gt;&lt;del&gt;SERVER-61482&lt;/del&gt;&lt;/a&gt; Avoid resharding holding open an oplog hole on configsvr.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 2d3592d80fb851e00b519bfeeea513aaff6d0c95)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/963c540bdc58509e4938f2d5981f13c66e012b59&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/963c540bdc58509e4938f2d5981f13c66e012b59&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4194102" author="xgen-internal-githook" created="Wed, 17 Nov 2021 03:49:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61482&quot; title=&quot;Updates to config.reshardingOperations wait for PrimaryOnlyService to be rebuilt while holding oplog slot, stalling replication on config server indefinitely&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61482&quot;&gt;&lt;del&gt;SERVER-61482&lt;/del&gt;&lt;/a&gt; Avoid resharding holding open an oplog hole on configsvr.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 2d3592d80fb851e00b519bfeeea513aaff6d0c95)&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a96a30f357990094f7e7b464cc143cab05716238&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a96a30f357990094f7e7b464cc143cab05716238&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4193056" author="xgen-internal-githook" created="Tue, 16 Nov 2021 20:16:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61482&quot; title=&quot;Updates to config.reshardingOperations wait for PrimaryOnlyService to be rebuilt while holding oplog slot, stalling replication on config server indefinitely&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61482&quot;&gt;&lt;del&gt;SERVER-61482&lt;/del&gt;&lt;/a&gt; Avoid resharding holding open an oplog hole on configsvr.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d3592d80fb851e00b519bfeeea513aaff6d0c95&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d3592d80fb851e00b519bfeeea513aaff6d0c95&lt;/a&gt;&lt;/p&gt;</comment>
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