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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-79072] Change the semantics for or ban ExecutureFuture::getAsync</title>
                <link>https://jira.mongodb.org/browse/SERVER-79072</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As &lt;a href=&quot;https://github.com/10gen/mongo/blob/3ad4a5ff13f42610bfeb8f34e512a72d172d2c37/src/mongo/util/future_test_executor_future.cpp#L70-L81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test case&lt;/a&gt; demonstrates, callbacks chained via ExecutureFuture::getAsync do not run when the executor rejects work / is shutdown. While this matches the semantics for ExecutorFuture::then / ExecutorFuture::onError, it obviously does not parallel the semantics for the other method of terminating a continuation chain, ExecutorFuture::get. The two cases aren&apos;t exactly parallel, because get requires another thread to block and receive the result of the continuation chain. However, terminating a continuation chain with getAsync and then allowing that getAsync to never run means that errors from earlier in the chain may &lt;em&gt;never&lt;/em&gt; be handled/addressed and are silently ignored. Logically, I don&apos;t think it makes sense to allow chains to terminate with unhandled results in the common case.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This has also bit us practically several times: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54735&quot; title=&quot;Executor shutdown can cause AsyncTry-until to set its result with ErrorCodes::BrokenPromise&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54735&quot;&gt;&lt;del&gt;SERVER-54735&lt;/del&gt;&lt;/a&gt;, &#160;BF-20215 ,&#160;BF-20298 , &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71662&quot; title=&quot;Prevent future util&amp;#39;s whenAllSuceed from throwing ErrorCodes::BrokenPromise on executor shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71662&quot;&gt;SERVER-71662&lt;/a&gt; , &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79070&quot; title=&quot;Executor shutdown can cause  async_rpc::getAllResponsesOrFirstErrorWithCancellation to return BrokenPromise&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79070&quot;&gt;&lt;del&gt;SERVER-79070&lt;/del&gt;&lt;/a&gt; all arise from this issue.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I propose that we either:&#160;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Ban ExecutorFuture::getAsync and remove existing use-cases, rewriting them to use onCompletion and somewhere requiring a blocking get&lt;/li&gt;
	&lt;li&gt;Modify the semantics so that the code in getAsync &lt;em&gt;always runs&lt;/em&gt;, even in the case of shutdown, but will possibly run inline in the case the executor rejects work. This is how we end up fixing the issue practically outside of the future-library today, via unsafeToInlineFuture, but the implications of doing so inside the library are greater.&#160;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2395106">SERVER-79072</key>
            <summary>Change the semantics for or ban ExecutureFuture::getAsync</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Jul 2023 19:33:02 +0000</created>
                <updated>Thu, 7 Dec 2023 20:26:07 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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