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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>[JAVA-3732] GridFS indices not created appropriate under a specific condition</title>
                <link>https://jira.mongodb.org/browse/JAVA-3732</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;h3&gt;&lt;a name=&quot;Thebackground%3A&quot;&gt;&lt;/a&gt;The background:&lt;/h3&gt;

&lt;p&gt;In our system we have two GridFS buckets:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/261140/261140_Bildschirmfoto+2020-05-15+um+23.47.06.png&quot; height=&quot;66&quot; width=&quot;217&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;I realised that the second one it getting slower and slower as long are we are using it (putting in more/bigger files). Also the delete operation was/is terribly slow on some nodes, up to &lt;b&gt;20 seconds&lt;/b&gt; per file.&lt;/p&gt;

&lt;p&gt;When searching for the problem I also checked the indices, because in most of the cases wrong/missing indices are the reason for slow DB results. And I found this:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/261139/261139_Bildschirmfoto+2020-05-15+um+23.47.16.png&quot; height=&quot;193&quot; width=&quot;230&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;While one of the buckets has the indices expected by the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/gridfs/gridfs-spec.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;GridFS specification&lt;/a&gt;, the other does not. And this is the case on &lt;b&gt;several&lt;/b&gt;&#160;and &lt;b&gt;independent, but not all&lt;/b&gt; of our server instances that run the same software, but do not share the same data.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Theproblem%3A&quot;&gt;&lt;/a&gt;The problem:&lt;/h3&gt;

&lt;p&gt;I analysed the source code of the java driver in the version I use (3.11) and the newer ones (3.12, 4.*, master) and found out that the indices are only created under the following conditions:&lt;/p&gt;

&lt;p&gt;(GridFS.java)&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&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: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// ensure standard indexes as long as collections are small&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;    &lt;/span&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;if&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; (filesCollection.count() &amp;lt; &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1000&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;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;        filesCollection.createIndex(&lt;/span&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;new&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; BasicDBObject(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;filename&quot;&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;).append(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;uploadDate&quot;&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;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;    &lt;/span&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;if&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; (chunksCollection.count() &amp;lt; &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1000&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;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;        chunksCollection.createIndex(&lt;/span&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;new&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; BasicDBObject(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;files_id&quot;&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;).append(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;n&quot;&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;This means:&lt;/ins&gt; When I create a GridFS object which holds less than 1000 items, these indices should have been created, but that&apos;s not the case as you can see on the screenshots.&lt;/p&gt;

&lt;p&gt;Currently I don&apos;t know why for one DB they are created and not for the other, but my &lt;b&gt;speculation&lt;/b&gt; is that it is has to do with the fact that on some instances especially the one bucket which is missing the index is filled up with many files directly after creation. So it could be the case, that...&lt;/p&gt;

&lt;p&gt;1) the index is not created, because the bucket does not exist at startup&lt;/p&gt;

&lt;p&gt;2) the index is not created on the second connect, because the db already contains more than 1000 chunks.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;==&amp;gt; the index is never created&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;I will try to further investigate and provide updates. But I think this is quite an important issues, because it really drastically affects performance.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment>mongodb 3.6.2 has been used, others not checked</environment>
        <key id="1353015">JAVA-3732</key>
            <summary>GridFS indices not created appropriate under a specific condition</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="filler@pathmate-technologies.com">Andreas Filler</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 May 2020 22:08:29 +0000</created>
                <updated>Fri, 27 Oct 2023 13:20:59 +0000</updated>
                            <resolved>Mon, 18 May 2020 12:05:38 +0000</resolved>
                                    <version>3.11.2</version>
                    <version>3.12.4</version>
                    <version>4.0.3</version>
                                                    <component>API</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3091959" author="jeff.yemin" created="Mon, 18 May 2020 12:05:38 +0000"  >&lt;p&gt;No worries.  Thank you for following up.&lt;/p&gt;</comment>
                            <comment id="3090868" author="JIRAUSER1252116" created="Fri, 15 May 2020 22:26:06 +0000"  >&lt;h2&gt;&lt;a name=&quot;&quot;&gt;&lt;/a&gt;&lt;font color=&quot;#FF0000&quot;&gt;&lt;b&gt;A big sorry from my side.&lt;/b&gt; The ticket can be deleted. &lt;/font&gt;&lt;/h2&gt;

&lt;p&gt;The problem was one of our maintenance scripts, which removed &quot;unnecessary&quot; indices. So the mistake is on our side.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="261140" name="Bildschirmfoto 2020-05-15 um 23.47.06.png" size="26741" author="filler@pathmate-technologies.com" created="Fri, 15 May 2020 21:48:32 +0000"/>
                            <attachment id="261139" name="Bildschirmfoto 2020-05-15 um 23.47.16.png" size="80775" author="filler@pathmate-technologies.com" created="Fri, 15 May 2020 21:51:14 +0000"/>
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