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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-10213] Allow eval() against a SINGLE document in a sharded collection (A.K.A findAndEval)</title>
                <link>https://jira.mongodb.org/browse/SERVER-10213</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I know there are some fundamental limitations of running eval() on a sharded cluster for general purpose JavaScript, but I believe that my specific use case is feasible given the limitations of sharding. The difference for my use case is that I want eval() against only a single document for read or write. You could think of it as a modification of findAndModify() where we want to find and eval, instead of modify. This means that the eval() command can be run on the shard itself (monogd server), and not in the router (mongos server). &lt;/p&gt;

&lt;p&gt;I believe that this is possible with the following semantics: &lt;/p&gt;

&lt;p&gt;1. Client app issues request to a mongos server. The request contains a document _id (or some other reference containing the entire shard key) and the javascript to eval() against the document. &lt;br/&gt;
2. command is routed to the correct shard (rather than executing the command on the mongos)&lt;br/&gt;
3. the shard containing the document write locks for the collection&lt;br/&gt;
4. the shard pulls the document and executes the JavaScript against the document&lt;br/&gt;
5. access to any other document for read/write/whatever is prohibited. &lt;br/&gt;
6. once JavScript finished modifying the document, the document is stored. &lt;br/&gt;
7. write lock released for collection on that shard.&lt;/p&gt;

</description>
                <environment>Linux</environment>
        <key id="82302">SERVER-10213</key>
            <summary>Allow eval() against a SINGLE document in a sharded collection (A.K.A findAndEval)</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="-1">Unassigned</assignee>
                                    <reporter username="ahildoer">ahildoer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Jul 2013 16:17:22 +0000</created>
                <updated>Thu, 17 Mar 2016 12:54:06 +0000</updated>
                            <resolved>Mon, 15 Jul 2013 17:10:49 +0000</resolved>
                                    <version>2.4.5</version>
                                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1206543" author="ehremo" created="Thu, 17 Mar 2016 12:51:02 +0000"  >&lt;p&gt;This is not necessarily a dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-458&quot; title=&quot;JavaScript $function in update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-458&quot;&gt;&lt;del&gt;SERVER-458&lt;/del&gt;&lt;/a&gt;, if the function is interpreted as the projection.&lt;/p&gt;

&lt;p&gt;My use case is that have some large documents, and I would like my queries to only return a subset of the information. For example if I wanted only the keys I&apos;d like to be able to do this&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.collection.find(&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    function(d) {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        return Object.keys(d);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;This is particularly important when the query is being made from another process to avoid sending back lots of unnecessary data.&lt;/p&gt;</comment>
                            <comment id="381418" author="scotthernandez" created="Mon, 15 Jul 2013 17:10:49 +0000"  >&lt;p&gt;dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-458&quot; title=&quot;JavaScript $function in update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-458&quot;&gt;&lt;del&gt;SERVER-458&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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