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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-57952] Resharding donor shards cannot complete a shard version refresh after acquiring the critical section, stalling the resharding operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-57952</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Shards during a resharding operation &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3befdc7d70fa56085bbdc9606da0db84b5b48ccd/src/mongo/db/s/resharding/resharding_donor_recipient_common.cpp#L340&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;rely on a shard version refresh to be triggered after a new primary has stepped up&lt;/a&gt; for the DonorStateMachine and RecipientStateMachines to learn of a change to the coordinator&apos;s state. However, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3befdc7d70fa56085bbdc9606da0db84b5b48ccd/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L120-L121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a shard version refresh won&apos;t be able to complete while the critical section is held&lt;/a&gt;. This means if &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3befdc7d70fa56085bbdc9606da0db84b5b48ccd/src/mongo/db/s/resharding/resharding_donor_service.cpp#L603&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the write to acquire the critical section&lt;/a&gt; becomes majority&amp;#45;committed but the write to transition to DonorStateEnum::kBlockingWrites doesn&apos;t, then the donor shard will be stuck unable to advance past DonorStateEnum::kDonatingOplogEntries. The shard version refresh won&apos;t be able to complete while the critical section is held and so the donor shard won&apos;t realize it is safe for it to complete its transition to DonorStateEnum::kBlockingWrites.&lt;/p&gt;

&lt;p&gt;The DonorStateEnum::kPreparingToBlockWrites state had been removed as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55677&quot; title=&quot;Remove resharding&amp;#39;s DonorStateEnum::kPreparingToBlockWrites state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55677&quot;&gt;&lt;del&gt;SERVER-55677&lt;/del&gt;&lt;/a&gt; but could be reintroduced to solve this issue. A donor shard coming up in DonorStateEnum::kPreparingToBlockWrites would mean the donor shard doesn&apos;t need to wait for a shard version refresh to complete before it can complete its transition to DonorStateEnum::kBlockingWrites.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1792903">SERVER-57952</key>
            <summary>Resharding donor shards cannot complete a shard version refresh after acquiring the critical section, stalling the resharding operation</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-lifecycle</label>
                            <label>post-rc0</label>
                    </labels>
                <created>Tue, 22 Jun 2021 16:44:00 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:46 +0000</updated>
                            <resolved>Thu, 24 Jun 2021 12:31:00 +0000</resolved>
                                                    <fixVersion>5.0.0-rc4</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4106946" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:13:21 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3896193" author="xgen-internal-githook" created="Thu, 24 Jun 2021 11:47:46 +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-57952&quot; title=&quot;Resharding donor shards cannot complete a shard version refresh after acquiring the critical section, stalling the resharding operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57952&quot;&gt;&lt;del&gt;SERVER-57952&lt;/del&gt;&lt;/a&gt; Re-add DonorStateEnum::kPreparingToBlockWrites.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit bd1a5b70ff899b8a5271136cfbb989094442d75b)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6b14a422616c84e5f8eab8c3bf81618bcf7ebc17&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6b14a422616c84e5f8eab8c3bf81618bcf7ebc17&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3895405" author="xgen-internal-githook" created="Wed, 23 Jun 2021 21:26:28 +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-57952&quot; title=&quot;Resharding donor shards cannot complete a shard version refresh after acquiring the critical section, stalling the resharding operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57952&quot;&gt;&lt;del&gt;SERVER-57952&lt;/del&gt;&lt;/a&gt; Re-add DonorStateEnum::kPreparingToBlockWrites.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bd1a5b70ff899b8a5271136cfbb989094442d75b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bd1a5b70ff899b8a5271136cfbb989094442d75b&lt;/a&gt;&lt;/p&gt;</comment>
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