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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-55686] Prevent resharding coordinator document from exceeding 16MB BSON size limit</title>
                <link>https://jira.mongodb.org/browse/SERVER-55686</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Donor and recipient shards periodically update the config.reshardingOperations document on the config server as part of their state changes. Most of the DonorShardContext and RecipientShardContext types are fixed in size. The exception to this for both donor and recipient shards is the abortReason. To prevent the situation where multiple participants have an abortReason causing the update to fail with BSONObjectTooLarge, the donor and recipient shards must truncate their abortReason in the update to the config.reshardingOperations collection.&lt;/p&gt;

&lt;p&gt;Things to consider:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If serializeErrorToBSON() yields a BSONObj larger than 2000 bytes then the abortReason must be truncated. 2000 bytes is to be generous for when there are a large number of shards (up to 1000) that error simultaneously.&lt;/li&gt;
	&lt;li&gt;Truncate the abortReason by doing the following:
	&lt;ol&gt;
		&lt;li&gt;Serialize the Status to a string with Status::toString(). This enables the Status to partially include a serialized form of its ErrorExtraInfo if its reason is short enough.&lt;/li&gt;
		&lt;li&gt;Truncate the string using &lt;a href=&quot;https://github.com/mongodb/mongo/blob/94ca184fae96ae62b5044b01ea99863241cdd5c4/src/mongo/util/str.h#L354&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;UTF8SafeTruncation()&lt;/a&gt;.&lt;/li&gt;
		&lt;li&gt;Create a new Status using a new ReshardCollectionTruncatedError code with the truncated string as the error reason.&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1667758">SERVER-55686</key>
            <summary>Prevent resharding coordinator document from exceeding 16MB BSON size limit</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="haley.connelly@mongodb.com">Haley Connelly</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-error-flow</label>
                            <label>post-rc0</label>
                    </labels>
                <created>Thu, 1 Apr 2021 02:40:44 +0000</created>
                <updated>Sun, 29 Oct 2023 21:55:32 +0000</updated>
                            <resolved>Thu, 3 Jun 2021 16:43:37 +0000</resolved>
                                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4108387" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 19:05:45 +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="3863028" author="xgen-internal-githook" created="Mon, 7 Jun 2021 17:36:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Haley Connelly&apos;, &apos;email&apos;: &apos;haley.connelly@mongodb.com&apos;, &apos;username&apos;: &apos;haleyConnelly&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55686&quot; title=&quot;Prevent resharding coordinator document from exceeding 16MB BSON size limit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55686&quot;&gt;&lt;del&gt;SERVER-55686&lt;/del&gt;&lt;/a&gt; Prevent resharding coordinator document from exceeding 16MB BSON size limit&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cfc835ec83a9db2ecfd67c95099a0321bafe0e38&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cfc835ec83a9db2ecfd67c95099a0321bafe0e38&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3855410" author="xgen-internal-githook" created="Thu, 3 Jun 2021 00:03:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Haley Connelly&apos;, &apos;email&apos;: &apos;haley.connelly@mongodb.com&apos;, &apos;username&apos;: &apos;haleyConnelly&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55686&quot; title=&quot;Prevent resharding coordinator document from exceeding 16MB BSON size limit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55686&quot;&gt;&lt;del&gt;SERVER-55686&lt;/del&gt;&lt;/a&gt; Prevent resharding coordinator document from exceeding 16MB BSON size limit&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1274f16682fd01d35c98db39b202d7acdf3e554b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1274f16682fd01d35c98db39b202d7acdf3e554b&lt;/a&gt;&lt;/p&gt;</comment>
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