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    <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-57477] stdx::erase_if for stdx::unordered_map</title>
                <link>https://jira.mongodb.org/browse/SERVER-57477</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Introduce a &lt;tt&gt;stdx::erase_if&lt;/tt&gt; that properly handles &lt;tt&gt;absl::node_hash_map&lt;/tt&gt;, which has the peculiar semantics that &lt;tt&gt;erase(pos)&lt;/tt&gt; doesn&apos;t return an iterator but also doesn&apos;t change traversal order.&lt;/p&gt;

&lt;p&gt;Call this &lt;tt&gt;erase_if&lt;/tt&gt; function to repair range based for loops where an element can be erased from the range, and similar code.&lt;/p&gt;

&lt;p&gt;This work must be done on its own merits as the codebase is currently suffering UB from these erased iterators, but it also unblocks abseil upgrade &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51476&quot; title=&quot;Upgrade Abseil to 20210324.1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51476&quot;&gt;&lt;del&gt;SERVER-51476&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Similar to the fix in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57267&quot; title=&quot;Dereference of invalid iterator in connection pool&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57267&quot;&gt;&lt;del&gt;SERVER-57267&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;


&lt;p&gt;Abseil at head actually already has &lt;a href=&quot;https://chromium.googlesource.com/external/github.com/abseil/abseil-cpp/+/HEAD/absl/container/node_hash_map.h#530&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;absl::erase_if&lt;/a&gt; overloads for the containers so we can bring that into stdx later.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1769843">SERVER-57477</key>
            <summary>stdx::erase_if for stdx::unordered_map</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Sat, 5 Jun 2021 18:22:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:34 +0000</updated>
                            <resolved>Thu, 10 Jun 2021 00:40:59 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4107616" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:31:28 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3863862" author="xgen-internal-githook" created="Mon, 7 Jun 2021 22:23:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57477&quot; title=&quot;stdx::erase_if for stdx::unordered_map&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57477&quot;&gt;&lt;del&gt;SERVER-57477&lt;/del&gt;&lt;/a&gt; stdx::erase_if for stdx::unordered_map&lt;/p&gt;

&lt;p&gt;Fix loops that erase elements of the container while iterating over it.&lt;/p&gt;

&lt;p&gt;revert api_version_metrics.cpp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f63751ef3dbe5513211e74f0554b42e466ae9711&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f63751ef3dbe5513211e74f0554b42e466ae9711&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3861369" author="billy.donahue" created="Sat, 5 Jun 2021 22:43:28 +0000"  >
&lt;p&gt;Bug in api_version_metrics.cpp introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49965&quot; title=&quot;Add apiVersion metrics to serverStatus and remove stale metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49965&quot;&gt;&lt;del&gt;SERVER-49965&lt;/del&gt;&lt;/a&gt;,&lt;br/&gt;
which was released in 4.7.&lt;/p&gt;</comment>
                            <comment id="3861356" author="billy.donahue" created="Sat, 5 Jun 2021 20:23:41 +0000"  >&lt;p&gt;Code Review&lt;br/&gt;
&lt;a href=&quot;https://mongodbcr.appspot.com/800010001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/800010001/&lt;/a&gt;&lt;/p&gt;</comment>
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