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    <title>MongoDB Jira</title>
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    <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-4582] detect data inserted directly into a shard server incorrectly</title>
                <link>https://jira.mongodb.org/browse/SERVER-4582</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When changing from a non-sharded to a sharded deployment, it is easy to forget&lt;br/&gt;
to update all application components to connect through mongos instead of&lt;br/&gt;
connecting to a replica set.  If this conversion is missed, it is possible for&lt;br/&gt;
an application to insert data into a sharded collection directly, bypassing&lt;br/&gt;
mongos.  This can result in data being inserted into the incorrect shard.&lt;br/&gt;
Such data appears to disappear when sought through mongos:  mongos will route&lt;br/&gt;
queries to the appropriate shard, and the data is not found there.&lt;/p&gt;

&lt;p&gt;Shard servers are aware they are part of a sharded setup because of the&lt;br/&gt;
shardsvr startup flag.  Therefore, they should be able to verify inserted data&lt;br/&gt;
is within the expected shard chunk key ranges for themselves, and complain&lt;br/&gt;
otherwise.&lt;/p&gt;</description>
                <environment></environment>
        <key id="27430">SERVER-4582</key>
            <summary>detect data inserted directly into a shard server incorrectly</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Dec 2011 21:25:03 +0000</created>
                <updated>Tue, 6 Dec 2022 05:37:58 +0000</updated>
                            <resolved>Thu, 22 Jul 2021 07:37:57 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="76672" author="scotthernandez" created="Thu, 29 Dec 2011 21:52:28 +0000"  >&lt;p&gt;See the documentation for the shardsvr option in the config file &amp;#8211; &lt;a href=&quot;http://www.mongodb.org/display/DOCS/File+Based+Configuration&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/File+Based+Configuration&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="76667" author="cwestin" created="Thu, 29 Dec 2011 21:42:02 +0000"  >&lt;p&gt;I&apos;ve never seen any documentation that says shardsvr is optional.&lt;/p&gt;

&lt;p&gt;Even so, the above suggests checking if shardsvr is on, that is all.  &lt;/p&gt;</comment>
                            <comment id="76660" author="scotthernandez" created="Thu, 29 Dec 2011 21:30:05 +0000"  >&lt;p&gt;&lt;tt&gt;--shardsvr&lt;/tt&gt; is optional but suggested, and doesn&apos;t currently work as a flag because of that.&lt;/p&gt;

&lt;p&gt;If clients checked for a sharded version state (in memory once the shard server has received the first setShardVersion command) then it could reject writes on non-sharded connected but currently this is designed to allow direct access to shards via non-sharded clients. This is commonly used for distributed updates and other administrative tasks when the load balancer is off.&lt;/p&gt;</comment>
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