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    <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-85927] Reduce fuzzer comparison result speeds due to resolving Object.entries</title>
                <link>https://jira.mongodb.org/browse/SERVER-85927</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78357&quot; title=&quot;Object.entries does not return lazy properties that were not previously resolved for JS Object-BSON/BSONInfo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78357&quot;&gt;&lt;del&gt;SERVER-78357&lt;/del&gt;&lt;/a&gt; introduced a change where we are correctly resolving Object.entries and iterating through the object. However, this change caused the fuzzers to slow down by 4x (BF-31522 and BF-31438). We did not want to revert the change since it is a correctness issue, but we believe the fuzzers might not have been affected by the original bug. However, initial attempts to avoid using Object.entries did not speed up the fuzzers, so we left this open to investigate for this project. Because of the slowdown we had to increase the timeout of multiple fuzzers or reduce the number of pipelines run (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85725&quot; title=&quot;Reduce aggregation_wildcard_fuzzer test file runtime or increase timeouts in debug/tsan/asan variants&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85725&quot;&gt;&lt;del&gt;SERVER-85725&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85780&quot; title=&quot;Increase timeout for aggregation timeseries fuzzer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85780&quot;&gt;&lt;del&gt;SERVER-85780&lt;/del&gt;&lt;/a&gt;). Ideally we would be able to revert these changes if the fuzzers are running faster again.&lt;/p&gt;

&lt;p&gt;Most of the calls to Object.entries is coming from &lt;a href=&quot;https://github.com/10gen/jstestfuzz/blob/057cc5760194a51b8817efb81c616e1f7e6b2ec1/src/fuzzers/agg/agg_compare_results.js#L116&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;these lines&lt;/a&gt; when we are comparing results.&lt;/p&gt;

&lt;p&gt;We found DEVPROD-2814, which was already created to improve comparison result speed, but it was filed before &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78357&quot; title=&quot;Object.entries does not return lazy properties that were not previously resolved for JS Object-BSON/BSONInfo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78357&quot;&gt;&lt;del&gt;SERVER-78357&lt;/del&gt;&lt;/a&gt;. This ticket should investigate the effects of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78357&quot; title=&quot;Object.entries does not return lazy properties that were not previously resolved for JS Object-BSON/BSONInfo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78357&quot;&gt;&lt;del&gt;SERVER-78357&lt;/del&gt;&lt;/a&gt; and see where the slowdown is coming from.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2560972">SERVER-85927</key>
            <summary>Reduce fuzzer comparison result speeds due to resolving Object.entries</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="gil.alon@mongodb.com">Gil Alon</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Jan 2024 14:35:58 +0000</created>
                <updated>Wed, 31 Jan 2024 01:02:32 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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