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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-46981] The MongoS write commands scheduler does not account for the potential size of the response BSON</title>
                <link>https://jira.mongodb.org/browse/SERVER-46981</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When constructing the batch insert/update/delete command to send to shards, the MongoS write commands scheduler (aka BatchWriteExecutor), &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8f33cc286ef975d99f0df2f40a8568a80fa1f3f3/src/mongo/s/write_ops/batch_write_op.cpp#L377&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;accounts for the size&lt;/a&gt; of the outgoing request, so it doesn&apos;t exceed the 16MB BSON size limit on the way out. However, this doesn&apos;t guarantee that the response, which gets generated by the shard will not exceed that size.&lt;/p&gt;

&lt;p&gt;This is usually not problematic for &lt;b&gt;&lt;tt&gt;ordered=true&lt;/tt&gt;&lt;/b&gt; batches or for smaller&#160;&lt;b&gt;&lt;tt&gt;ordered=false&lt;/tt&gt;&lt;/b&gt; batches. However for larger &lt;b&gt;&lt;tt&gt;ordered=false&lt;/tt&gt;&lt;/b&gt; batches, because of the way the &lt;b&gt;&lt;tt&gt;writeErrors&lt;/tt&gt;&lt;/b&gt; is generated, the response can grow to be much larger than the request.&lt;/p&gt;

&lt;p&gt;As an example, a batch insert of 100.000 entries which encounters a StaleShardVersion, will result in this kind of situation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1282066">SERVER-46981</key>
            <summary>The MongoS write commands scheduler does not account for the potential size of the response BSON</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>
                            <label>PM-1645-Milestone-1</label>
                    </labels>
                <created>Thu, 19 Mar 2020 13:20:56 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:34 +0000</updated>
                            <resolved>Mon, 6 Apr 2020 10:40:06 +0000</resolved>
                                    <version>4.2.4</version>
                    <version>4.0.17</version>
                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3026927" author="xgen-internal-githook" created="Mon, 6 Apr 2020 10:31:54 +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-46981&quot; title=&quot;The MongoS write commands scheduler does not account for the potential size of the response BSON&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46981&quot;&gt;&lt;del&gt;SERVER-46981&lt;/del&gt;&lt;/a&gt; Make the BatchWriteExecutor account for the potential size of the error response&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1d6cd3e2fbe7b31fab7c6d2dc73587c40ec66d56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1d6cd3e2fbe7b31fab7c6d2dc73587c40ec66d56&lt;/a&gt;&lt;/p&gt;</comment>
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