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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>
    </build-info>


<item>
            <title>[SERVER-20614] Add a new method to &quot;quickly jump&quot; documents in a cursor (that has been skipped and already iterated).</title>
                <link>https://jira.mongodb.org/browse/SERVER-20614</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add a new method to &quot;quickly jump&quot; documents in a cursor (that has been skipped and already iterated).&lt;/p&gt;

&lt;p&gt;This might be done either allowing to invoke skip() twice (in a way that the second time it starts skipping from current position) or providing a method similar to next() that does not actually return data (at least avoiding network traffic between MongoDB and the client).&lt;/p&gt;

&lt;p&gt;The usage scenario is the following:&lt;/p&gt;

&lt;p&gt;We have a huge collection and created a cursor skipping N documents (being N big, say 10 millions). We retrieve some documents, and now we need to jump another M documents.&lt;/p&gt;

&lt;p&gt;We have two options:&lt;br/&gt;
1- Create another cursor and skipping it N+M times;&lt;br/&gt;
2- Invoke next() M times on the original cursor.&lt;/p&gt;

&lt;p&gt;Being N big, option 1 results slow.&lt;/p&gt;

&lt;p&gt;On the other side, next() is less efficient than skip() to &quot;just jump&quot; documents. Our tests suggest that using next() M times (option 2) is worthwhile only if M is less than 10% of N.&lt;/p&gt;

&lt;p&gt;I&apos;m from the RESTHeart team (&lt;a href=&quot;http://restheart.org&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://restheart.org&lt;/a&gt;), and we met this need implementing a DBCursor Pool to speedup queries on collections (that already speedups things up to 1000% according to performance tests).&lt;/p&gt;

&lt;p&gt;For some reference about the idea, have a look at: &lt;a href=&quot;https://softinstigate.atlassian.net/wiki/x/h4CM&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://softinstigate.atlassian.net/wiki/x/h4CM&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Performance test results:&lt;br/&gt;
&lt;a href=&quot;https://softinstigate.atlassian.net/wiki/x/gICM&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://softinstigate.atlassian.net/wiki/x/gICM&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;For some code:&lt;br/&gt;
&lt;a href=&quot;https://github.com/SoftInstigate/restheart/blob/develop/src/main/java/org/restheart/db/DBCursorPool.java&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/SoftInstigate/restheart/blob/develop/src/main/java/org/restheart/db/DBCursorPool.java&lt;/a&gt; &lt;/p&gt;</description>
                <environment></environment>
        <key id="230893">SERVER-20614</key>
            <summary>Add a new method to &quot;quickly jump&quot; documents in a cursor (that has been skipped and already iterated).</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="uji">Andrea Di Cesare</reporter>
                        <labels>
                            <label>feature</label>
                    </labels>
                <created>Tue, 22 Sep 2015 10:37:56 +0000</created>
                <updated>Tue, 6 Oct 2015 09:30:19 +0000</updated>
                            <resolved>Mon, 5 Oct 2015 22:32:37 +0000</resolved>
                                    <version>3.0.4</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1052231" author="uji" created="Tue, 6 Oct 2015 09:30:19 +0000"  >&lt;p&gt;Hi Jason&lt;/p&gt;

&lt;p&gt;I think you misunderstood the proposal: it is not about implementing a complex &quot;mechanism to advance a cursor by an arbitrary number of results&quot;.&lt;/p&gt;

&lt;p&gt;It is rather to have a method similar to OP_NEXT that &quot;advance the cursor by one result at a time&quot; but avoiding to actually send data back to the client over the wire.&lt;/p&gt;

&lt;p&gt;This way, there is no need for a complex development, and we can save bandwidth usage (that can be the most expensive task) in the scenarios that I have described.&lt;/p&gt;</comment>
                            <comment id="1051793" author="rassi@10gen.com" created="Mon, 5 Oct 2015 21:43:30 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;If I understand correctly, this feature request is for an efficient mechanism to advance a cursor by an arbitrary number of results. By design, MongoDB cursors are only allowed to be advanced by one result at a time; implementing this feature would be a large undertaking, and I am of the opinion that it&apos;s the application&apos;s job to implement optimizations such as the ones discussed in the ticket description.&lt;/p&gt;

&lt;p&gt;As such, I am resolving this ticket as &quot;Won&apos;t Fix&quot;.&lt;/p&gt;

&lt;p&gt;~ Jason Rassi&lt;/p&gt;</comment>
                            <comment id="1042122" author="uji" created="Thu, 24 Sep 2015 15:32:34 +0000"  >&lt;p&gt;Jeff,&lt;/p&gt;

&lt;p&gt;not decoding BSON would be indeed an improvement, even if small compared to the network transfer time.&lt;/p&gt;

&lt;p&gt;I really think that what I propose would be a great improvement to MongoDB, since we all know that skip() can have low performance (even the official documentation suggests to avoid it in favor of range-based pagination) and this way we better support optimization strategies such as our cursor pools..&lt;/p&gt;

&lt;p&gt;Do you thing it would be possible extending the wire protocol with the OP_JUMP message:&lt;/p&gt;

&lt;p&gt;OP_JUMP&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;struct&lt;/span&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;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    MsgHeader header;              &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// standard message header&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    int32     ZERO;                      &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// 0 - reserved for future use&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    cstring   fullCollectionName; &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// &quot;dbname.collectionname&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    int32     *numberToJump;*    &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// number of documents to jump&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    int64     cursorID;                  &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// cursorID from the OP_REPLY&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   margin-bottom: 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;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The response would be a OP_REPLY message sent by the database will null documents field and numberReturned being the actual number of jumped documents.&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;struct&lt;/span&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;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    MsgHeader header;          &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// standard message header&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    int32     responseFlags;    &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// bit vector - see details below&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    int64     cursorID;              &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// cursor id if client needs to do get more&apos;s&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    int32     startingFrom;        &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// where in the cursor this reply is starting&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    int32     numberReturned; &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// number of documents in the reply&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    document* documents;      &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// documents&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   margin-bottom: 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;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Then implementing cursor.jump() on the Java driver should be easy....&lt;/p&gt;

&lt;p&gt;Thanks for your time&lt;/p&gt;</comment>
                            <comment id="1041926" author="jeff.yemin" created="Thu, 24 Sep 2015 13:32:10 +0000"  >&lt;p&gt;Andrea,&lt;/p&gt;

&lt;p&gt;I don&apos;t see how it&apos;s possible to avoid the network data transfer time.  MongoDB cursors just don&apos;t work that way.  After the skip on the initial query, there is no way to ask the server to skip again.  A driver has to read all documents in order off the wire through a series of get-more messages and responses.&lt;/p&gt;

&lt;p&gt;The best we could do would be to avoid the BSON decoding costs by just reading the bytes off the wire but not turning them into DBObject instances.&lt;/p&gt;
</comment>
                            <comment id="1041831" author="uji" created="Thu, 24 Sep 2015 11:56:41 +0000"  >&lt;p&gt;Since invoking skip() twice on the same cursor is a no option, I propose to implement the method:&lt;/p&gt;

&lt;p&gt;&lt;b&gt;jump(int n)&lt;/b&gt; Moves the cursor ahead by n.&lt;/p&gt;

&lt;p&gt;as opposed to:&lt;/p&gt;

&lt;p&gt;&lt;b&gt;next()&lt;/b&gt; Returns the object the cursor is at and moves the cursor ahead by one.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;jump()&lt;/b&gt; basically does everything &lt;b&gt;next()&lt;/b&gt; does but actually retrieving the DBObject to save network data transfer time.&lt;/p&gt;

&lt;p&gt;Would this be possible?&lt;/p&gt;</comment>
                            <comment id="1040839" author="jeff.yemin" created="Wed, 23 Sep 2015 14:22:27 +0000"  >&lt;p&gt;How do you propose that a subsequent skip would be implemented by the driver?&lt;/p&gt;

&lt;p&gt;Consider that the skip is part of the &lt;a href=&quot;http://docs.mongodb.org/meta-driver/latest/legacy/mongodb-wire-protocol/#op-query&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OP_QUERY&lt;/a&gt; message that the driver sends to the server.  See for details.  But &lt;a href=&quot;http://docs.mongodb.org/meta-driver/latest/legacy/mongodb-wire-protocol/#op-get-more&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OP_GET_MORE&lt;/a&gt; messages has no such thing, so once the initial skip is done, the driver must retrieve the remaining query results in order.&lt;/p&gt;

&lt;p&gt;Let me know if that doesn&apos;t jibe with your understanding.&lt;/p&gt;</comment>
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