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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>
    </build-info>


<item>
            <title>[SERVER-62065] Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-62065</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 4.0 we introduced support for a multi-version routing table (PM-1013). This later (in 4.2) became the basis for distributed transactions and snapshot reads. As part of this project, we introduced a &lt;a href=&quot;https://github.com/mongodb/mongo/commit/7db37fa2823760ae2a9f061f5682c6bb3c2c3ad0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;history&lt;/tt&gt;&lt;/a&gt; field to the persisted chunk type, but we never actually used it in 4.0.&lt;/p&gt;

&lt;p&gt;Since we never used it, the backup/restore procedures ever since 4.0 have referenced that this field is safe do delete on restore. However, it is actually not safe to do so, because it breaks snapshot reads (routing and filtering at a point in time).&lt;/p&gt;

&lt;p&gt;Furthermore, due to the optimisation done under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53274&quot; title=&quot;The force-write of the `history` field to all chunks on FCV upgrade from 3.6 to 4.0 is unnecessary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53274&quot;&gt;&lt;del&gt;SERVER-53274&lt;/del&gt;&lt;/a&gt;, we can again have chunks with not history field in the persisted shard-local &lt;tt&gt;config.system.cache.chunks&lt;/tt&gt; collection.&lt;/p&gt;

&lt;p&gt;As a result of the above, we can have 4.0, 4.2, 4.4, 5.0, 5.1, 5.2 clusters which are missing the history fields for some chunks, which in turn breaks snapshot reads and distributed transactions, which will fail with an error saying &lt;tt&gt;Chunk has no history entries&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;These clusters will not have any issue functioning, until customers start using distributed transactions and snapshot reads.&lt;/p&gt;

&lt;p&gt;This ticket is to provide manual procedure for restoring the history fields and to implement a command, which will restore the history fields automatically.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1950340">SERVER-62065</key>
            <summary>Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Dec 2021 15:00:03 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:01 +0000</updated>
                            <resolved>Wed, 5 Jan 2022 09:32:05 +0000</resolved>
                                    <version>4.0.27</version>
                    <version>4.2.17</version>
                    <version>4.4.10</version>
                    <version>5.0.5</version>
                    <version>5.1.1</version>
                    <version>5.2.0-rc1</version>
                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.0.6</fixVersion>
                    <fixVersion>4.2.19</fixVersion>
                    <fixVersion>4.0.29</fixVersion>
                    <fixVersion>5.2.1</fixVersion>
                    <fixVersion>4.4.13</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4307950" author="xgen-internal-githook" created="Sun, 23 Jan 2022 08:23:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Introduce the &apos;repairShardedCollectionChunksHistory&apos; command&lt;/p&gt;

&lt;p&gt;Make the CPP name of &apos;_flushRoutingTableCacheUpdates&apos; more user-friendly:&lt;br/&gt;
(cherry picked from commit bcadf746d07d2eb75103ca9b7956b02a481d7a7e)&lt;/p&gt;

&lt;p&gt;Remaining:&lt;br/&gt;
(cherry picked from commit 508f8dd9dd4aa27f15b327c84d5160146ffa8724)&lt;br/&gt;
(cherry picked from commit 949c3c821a419b3b6c3b284f5b19da2f645d39c3)&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1e4356dc8b944e56ba52a21f01eb8d1a9668a3d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1e4356dc8b944e56ba52a21f01eb8d1a9668a3d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4305002" author="sviatlana.zuiko" created="Fri, 21 Jan 2022 08:29:57 +0000"  >&lt;p&gt;Requesting a backport to 5.2&lt;/p&gt;</comment>
                            <comment id="4299526" author="xgen-internal-githook" created="Wed, 19 Jan 2022 07:19:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Fix linting error in &apos;configsvr_repair_sharded_collection_chunks_history_command.cpp&apos;&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/31d51388ae528e6ca2c25dbf5f8cca51fbd98f44&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/31d51388ae528e6ca2c25dbf5f8cca51fbd98f44&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4288449" author="xgen-internal-githook" created="Wed, 12 Jan 2022 15:45:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Introduce the &apos;repairShardedCollectionChunksHistory&apos; command&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 508f8dd9dd4aa27f15b327c84d5160146ffa8724)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/949c3c821a419b3b6c3b284f5b19da2f645d39c3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/949c3c821a419b3b6c3b284f5b19da2f645d39c3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4285526" author="xgen-internal-githook" created="Tue, 11 Jan 2022 14:30:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Make the CPP name of &apos;_flushRoutingTableCacheUpdates&apos; more user-friendly&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bcadf746d07d2eb75103ca9b7956b02a481d7a7e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bcadf746d07d2eb75103ca9b7956b02a481d7a7e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4284073" author="xgen-internal-githook" created="Mon, 10 Jan 2022 19:57:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Introduce the &apos;repairShardedCollectionChunksHistory&apos; command&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 146c18b9954abc116046621dc4849cc7d97ef523)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/508f8dd9dd4aa27f15b327c84d5160146ffa8724&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/508f8dd9dd4aa27f15b327c84d5160146ffa8724&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4282124" author="xgen-internal-githook" created="Sun, 9 Jan 2022 08:12:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Fix multiversion tests&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/af02b39db7129002de996f2fea6ceee744b530e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/af02b39db7129002de996f2fea6ceee744b530e7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4280813" author="xgen-internal-githook" created="Fri, 7 Jan 2022 17:23:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Introduce the &apos;repairShardedCollectionChunksHistory&apos; command&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3b56acfe78e91b607eafc737ebf88d237db1460a)&lt;br/&gt;
(cherry picked from commit bc2a34c6cb046127b6811ae8ae89abeb05a50b90)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/146c18b9954abc116046621dc4849cc7d97ef523&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/146c18b9954abc116046621dc4849cc7d97ef523&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4278088" author="xgen-internal-githook" created="Thu, 6 Jan 2022 12:36:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Introduce the &apos;repairShardedCollectionChunksHistory&apos; command&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3b56acfe78e91b607eafc737ebf88d237db1460a)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bc2a34c6cb046127b6811ae8ae89abeb05a50b90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bc2a34c6cb046127b6811ae8ae89abeb05a50b90&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4275660" author="xgen-internal-githook" created="Wed, 5 Jan 2022 09:26:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62065&quot; title=&quot;Upgrade path from 3.6 to 4.0 can leave chunk entries without history on the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62065&quot;&gt;&lt;del&gt;SERVER-62065&lt;/del&gt;&lt;/a&gt; Introduce the &apos;repairShardedCollectionChunksHistory&apos; command&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3b56acfe78e91b607eafc737ebf88d237db1460a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3b56acfe78e91b607eafc737ebf88d237db1460a&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>This change has introduced a new command called `repairShardedCollectionChunksHistory` to counteract the effects of the  bug described in this ticket.&lt;br/&gt;
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More about the operation of the command is available in its help option: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3b56acfe78e91b607eafc737ebf88d237db1460a/src/mongo/s/commands/cluster_repair_sharded_collection_chunks_history_cmd.cpp#L65&quot;&gt;https://github.com/mongodb/mongo/blob/3b56acfe78e91b607eafc737ebf88d237db1460a/src/mongo/s/commands/cluster_repair_sharded_collection_chunks_history_cmd.cpp#L65&lt;/a&gt;&lt;br/&gt;
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The command is under the `splitChunk` privilege so there shouldn&amp;#39;t be any need for changes to Atlas.</customfieldvalue>

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