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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-15856] GridFS chunk size limit is 255KB not 256KB</title>
                <link>https://jira.mongodb.org/browse/SERVER-15856</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b9ebf15a7afa4f8db780b6ba06fc796c1ee2816e/src/mongo/db/storage/mmap_v1/mmap_v1_engine.cpp#L231&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/b9ebf15a7afa4f8db780b6ba06fc796c1ee2816e/src/mongo/db/storage/mmap_v1/mmap_v1_engine.cpp#L231&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The method checkReadAhead assumes that the GridFS chunk size is 256KB. The GridFS chunk size has been changed to 255KB.&lt;/p&gt;</description>
                <environment></environment>
        <key id="166144">SERVER-15856</key>
            <summary>GridFS chunk size limit is 255KB not 256KB</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="daniel.alabi@10gen.com">Daniel Alabi</assignee>
                                    <reporter username="daniel.alabi@10gen.com">Daniel Alabi</reporter>
                        <labels>
                            <label>gridfs</label>
                            <label>mmapv1</label>
                    </labels>
                <created>Wed, 29 Oct 2014 15:36:56 +0000</created>
                <updated>Wed, 29 Oct 2014 17:23:25 +0000</updated>
                            <resolved>Wed, 29 Oct 2014 17:23:03 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="751656" author="daniel.alabi@10gen.com" created="Wed, 29 Oct 2014 17:21:46 +0000"  >&lt;p&gt;Reading &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13331&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-13331&lt;/a&gt;&lt;br/&gt;
has eliminated my qualms. Thanks.&lt;/p&gt;</comment>
                            <comment id="751521" author="scotthernandez" created="Wed, 29 Oct 2014 15:52:31 +0000"  >&lt;p&gt;Can you make it clear if you think this is a bug, and why/how?&lt;/p&gt;

&lt;p&gt;The 255KB in drivers is there to keep the actual storage to 256KB (quantized) buckets, since there is additional metadata which the drivers may not count in the limit.&lt;/p&gt;</comment>
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