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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>[SERVER-66261] Add a task executor that executes inline on the Future side</title>
                <link>https://jira.mongodb.org/browse/SERVER-66261</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be nice to have an executor compatible with ExecutorFutures that executes its tasks inline on the caller&apos;s thread so we can run code written to be async compatible synchronously (like &lt;a href=&quot;https://github.com/facebook/folly/blob/563d527d0da32f7fd99f6c1887116f9d307a01f6/folly/executors/QueuedImmediateExecutor.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;QueuedImmediateExecutor from facebook/folly&lt;/a&gt;). This would be especially useful for the recently added &lt;a href=&quot;https://github.com/mongodb/mongo/blob/883238375b56d7a4a11f48583a5f79a5f7192d87/src/mongo/db/transaction_api.h#L466-L470&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;TransactionWithRetries type&lt;/a&gt;, which executes transaction commands on a given executor but every current use is in a synchronous context.&lt;/p&gt;

&lt;p&gt;We already have the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/883238375b56d7a4a11f48583a5f79a5f7192d87/src/mongo/util/executor_test_util.h#L41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;InlineQueuedCountingExecutor &lt;/a&gt; which seems to do this, but it&apos;s in a test file so is probably not production quality.&lt;/p&gt;
&lt;hr /&gt;
&lt;p&gt;The initial use case for this will be `SyncTransactionWithRetries::runNoThrow`, which currently runs a work on an executor while using `get` to cause the main thread to wait. In this situation, there is no reason for the work to be run on a different thread.&lt;/p&gt;

&lt;p&gt;This can be solved with a new type `ManuallyManagedExecutor`.&#160;&lt;/p&gt;

&lt;p&gt;Before:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  margin-top: 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;Future fut = somethingThatTakesAnExecutor(_exec);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   margin-bottom: 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;fut.get(); &lt;/span&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;// Blocking call if fut is not ready. Work is done on a thread owned by `_exec`.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;After:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  margin-top: 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;ManuallyManagedExecutor exec();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;Future fut = somethingThatTakesAnExecutor(exec);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;exec.runUntilReady(fut); &lt;/span&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;// Work is done on this thread.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   margin-bottom: 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;fut.get(); &lt;/span&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;// Not a blocking call because we know fut is ready.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; There are complications associated with the existing usage patterns around executors. Generally executors are managed with shared_ptr. This means that a function taking this sort of executor might hold onto it longer than the caller expected. The correct implementation will need to take this into account and have some concept of an owner, so when the owner goes out of scope, it can reject work or maybe forward work to a fallback executor (otherwise accidental users of this executor will just hang).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2040750">SERVER-66261</key>
            <summary>Add a task executor that executes inline on the Future side</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>equality-ga</label>
                    </labels>
                <created>Thu, 5 May 2022 20:18:43 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:33 +0000</updated>
                            <resolved>Wed, 22 Mar 2023 20:23:24 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5296739" author="xgen-internal-githook" created="Thu, 23 Mar 2023 18:57:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75166&quot; title=&quot;Complete TODO listed in SERVER-66261&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75166&quot;&gt;&lt;del&gt;SERVER-75166&lt;/del&gt;&lt;/a&gt; Update TODOs referencing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66261&quot; title=&quot;Add a task executor that executes inline on the Future side&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66261&quot;&gt;&lt;del&gt;SERVER-66261&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4afdeed8b36429b52fbf857bb94653ccc0c9489b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4afdeed8b36429b52fbf857bb94653ccc0c9489b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5293484" author="xgen-internal-githook" created="Wed, 22 Mar 2023 20:20:55 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66261&quot; title=&quot;Add a task executor that executes inline on the Future side&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66261&quot;&gt;&lt;del&gt;SERVER-66261&lt;/del&gt;&lt;/a&gt; Add an executor type that executes inline&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/611c01c5b68d1892513b54cd7c6e63b544345700&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/611c01c5b68d1892513b54cd7c6e63b544345700&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="2229425">SERVER-72701</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10820">
                    <name>Initiative</name>
                                                                <inwardlinks description="included in Initiative">
                                                        </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2478413">SERVER-82313</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2298093">SERVER-75291</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2320235">SERVER-76363</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2295859">SERVER-75166</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2313249">SERVER-76030</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                                        </inwardlinks>
                                    </issuelinktype>
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