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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6161] BSONObjExternalSorter can consume 16TB of heap space</title>
                <link>https://jira.mongodb.org/browse/SERVER-6161</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The BSONObjExternalSorter performs in-memory sorts of sets of 1E6 BSON documents, writes the results to files, and then merges the files iteratively.  Since a BSON document can be up to 16MB, and since BSONObjExternalSorter::add() stores a heap-allocated BSON object (rather than a datafile backed BSON object), an external sort can occupy up to 16 TB of heap space, leading to OOM killing.&lt;/p&gt;

&lt;p&gt;Two possible fixes are (1) use the version of the BSON obj in the data files, and (2) limit the number of bytes we copy to the heap, instead of the number of objects.&lt;/p&gt;

&lt;p&gt;Option 1 has the advantage of copy minimization, allowing us to sort more data in memory (because the sort representation consists of small objects) and reducing heap fragmentation.&lt;/p&gt;

&lt;p&gt;Option 2 has the advantage of being a smaller source code change.&lt;/p&gt;

&lt;p&gt;Before repairing, I would like to see a (standalone?) repro of this being a problem.&lt;/p&gt;</description>
                <environment>Affects all 2.0 and 2.1 releases, maybe 1.8.</environment>
        <key id="42029">SERVER-6161</key>
            <summary>BSONObjExternalSorter can consume 16TB of heap space</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="9">Done</resolution>
                                        <assignee username="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Jun 2012 17:43:13 +0000</created>
                <updated>Wed, 15 Aug 2012 14:24:22 +0000</updated>
                            <resolved>Thu, 21 Jun 2012 18:40:02 +0000</resolved>
                                    <version>2.0.6</version>
                    <version>2.1.1</version>
                                                    <component>Index Maintenance</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="135430" author="schwerin" created="Thu, 21 Jun 2012 18:40:02 +0000"  >&lt;p&gt;Further down in BSONObjExternalSorter::add is the code that limits the number of elements that will be put into a single file, and hence held in RAM.  Still have the heap-copying cost, but the heap size impact shouldn&apos;t exceed the high tens of megabytes.&lt;/p&gt;</comment>
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