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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-46805] Validate should limit memory use in its second pass</title>
                <link>https://jira.mongodb.org/browse/SERVER-46805</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;validate&lt;/tt&gt; command runs in two passes. The first pass matches hashes of index key/value pairs generated by the documents against hashes of index key/value pairs appearing in the indexes by incrementing/decrementing counters depending on the hash. If any of the counters is non-zero in the end, there is corruption and a second pass will compute complete sets of extra/missing keys corresponding to each non-zero counter. With lots of corruption, this may require an amount of memory similar to or somewhat greater than the size of all indexes, possibly exhausting memory resources in the server.&lt;/p&gt;

&lt;p&gt;Instead, the second pass should make an estimate for the expected memory usage based on the number of non-zero counters, and if this estimate exceeds some predetermined value (either a fixed constant such as 100 MB or 1 GB, or a fraction of available memory) it should warn about potential excessive memory usage and limit itself to collecting keys corresponding to some (maybe just 1 or 2) counters. The validation result should clearly indicate that the results are incomplete and that more corruption exists.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1264866">SERVER-46805</key>
            <summary>Validate should limit memory use in its second pass</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="13201">Fixed</resolution>
                                        <assignee username="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 Mar 2020 19:19:23 +0000</created>
                <updated>Mon, 6 Nov 2023 18:12:56 +0000</updated>
                            <resolved>Thu, 19 Mar 2020 18:36:02 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.7</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4836803" author="vincent.do" created="Sun, 18 Sep 2022 22:43:04 +0000"  >&lt;p&gt;Nvm - I see the linked DOCS ticket. I will re-open those&lt;/p&gt;</comment>
                            <comment id="4836802" author="vincent.do" created="Sun, 18 Sep 2022 22:42:02 +0000"  >&lt;p&gt;Can we file a DOCS ticket to update our docs? It current says that this behavior exists only in 5.0+ &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/parameters/#mongodb-parameter-param.maxValidateMemoryUsageMB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/reference/parameters/#mongodb-parameter-param.maxValidateMemoryUsageMB&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3858967" author="xgen-internal-githook" created="Fri, 4 Jun 2021 01:04:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46805&quot; title=&quot;Validate should limit memory use in its second pass&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46805&quot;&gt;&lt;del&gt;SERVER-46805&lt;/del&gt;&lt;/a&gt; Limit memory usage in the second phase of validate and add parameter to configure this limit&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e398960773331f3b3afe000f2830c84868aaf9e7)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/057fff6d4dc4dc8f739abfc1e9a497ad3abb32ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/057fff6d4dc4dc8f739abfc1e9a497ad3abb32ce&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2987970" author="xgen-internal-githook" created="Thu, 19 Mar 2020 18:23:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;username&apos;: &apos;gregorynoma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46805&quot; title=&quot;Validate should limit memory use in its second pass&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46805&quot;&gt;&lt;del&gt;SERVER-46805&lt;/del&gt;&lt;/a&gt; Limit memory usage in the second phase of validate and add parameter to configure this limit&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e398960773331f3b3afe000f2830c84868aaf9e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e398960773331f3b3afe000f2830c84868aaf9e7&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>There is a new server parameter maxValidateMemoryUsageMB which limits the amount of memory that can be used by the validate command. The default value is 200MB. If the number of reported extra/missing index entries reported by validate is limited by this limit, the output from validate will specify this. If no extra/missing index entries are able to be reported because of the limit, the output will also specify the minimum amount of memory needed to report at least one extra/missing index entry.</customfieldvalue>

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