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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-35055] KeyedExecutor</title>
                <link>https://jira.mongodb.org/browse/SERVER-35055</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Provide a type which offers concurrent keyed and queued execution of tasks.&lt;/p&gt;

&lt;p&gt;Something that looks like:&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;KeyedExecutor&amp;lt;std::string&amp;gt; ke(someExecutorMaybeThreadPool);&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;auto doThingFuture = ke.execute(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;foo&quot;&lt;/span&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;, []{ &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&lt;/span&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; doThing(); });&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;auto doOtherThingFuture = ke.execute(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;foo&quot;&lt;/span&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;, []{ &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&lt;/span&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; doOtherthing(); });&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;auto waitForCurrentFooState = ke.waitForAll(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;foo&quot;&lt;/span&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;);&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;Where:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Jobs under the same key provide mutual exclusion&lt;/li&gt;
	&lt;li&gt;Tasks are executed via the passed executor&lt;/li&gt;
	&lt;li&gt;running jobs returns futures&lt;/li&gt;
	&lt;li&gt;waiting for a queue to clear up to a point is based on the back of the queue at the time of the call&apos;s future.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="545725">SERVER-35055</key>
            <summary>KeyedExecutor</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                            <label>service_architecture_continuous_delivery</label>
                    </labels>
                <created>Thu, 17 May 2018 19:42:47 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:44 +0000</updated>
                            <resolved>Fri, 25 May 2018 15:18:04 +0000</resolved>
                                                    <fixVersion>3.6.6</fixVersion>
                    <fixVersion>4.0.0-rc1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1902130" author="xgen-internal-githook" created="Fri, 25 May 2018 18:44:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;hanumantmk&apos;, &apos;name&apos;: &apos;Jason Carey&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35055&quot; title=&quot;KeyedExecutor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35055&quot;&gt;&lt;del&gt;SERVER-35055&lt;/del&gt;&lt;/a&gt; keyed executor&lt;/p&gt;

&lt;p&gt;This is a thread safe execution primitive for running jobs against an executor with mutual&lt;br/&gt;
exclusion and queuing by key.&lt;/p&gt;

&lt;p&gt;Features:&lt;br/&gt;
  Keyed - Tasks are submitted under a key.  The keys serve to prevent tasks for a given key from&lt;br/&gt;
          executing simultaneously.  Tasks submitted under different keys may run concurrently.&lt;/p&gt;

&lt;p&gt;  Queued - If a task is submitted for a key and another task is already running for that key, it&lt;br/&gt;
           is queued.  I.e. tasks are run in FIFO order for a key.&lt;/p&gt;

&lt;p&gt;  Thread Safe - This is a thread safe type.  Any number of callers may invoke the public api&lt;br/&gt;
                methods simultaneously.&lt;/p&gt;

&lt;p&gt;Special Enhancements:&lt;br/&gt;
  onCurrentTasksDrained- Invoking this method for a key allows a caller to wait until all of the&lt;br/&gt;
                         currently queued tasks for that key have completed.&lt;/p&gt;

&lt;p&gt;  onAllCurrentTasksDrained- Invoking this method allows a caller to wait until all of the&lt;br/&gt;
                            currently queued tasks for all key have completed.&lt;/p&gt;

&lt;p&gt;  KeyedExecutorRetry - Throwing or returning KeyedExecutorRetry in a task will cause the task to&lt;br/&gt;
                       be requeued immediately into the executor and retain its place in the&lt;br/&gt;
                       queue.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 333fdd10e3981ef3938dc4a6b5807f2f2da95110)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d7a0e604b64359bde786df66a70de08394daa2da&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d7a0e604b64359bde786df66a70de08394daa2da&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1901974" author="xgen-internal-githook" created="Fri, 25 May 2018 16:47:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;hanumantmk&apos;, &apos;name&apos;: &apos;Jason Carey&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35055&quot; title=&quot;KeyedExecutor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35055&quot;&gt;&lt;del&gt;SERVER-35055&lt;/del&gt;&lt;/a&gt; keyed executor&lt;/p&gt;

&lt;p&gt;This is a thread safe execution primitive for running jobs against an executor with mutual&lt;br/&gt;
exclusion and queuing by key.&lt;/p&gt;

&lt;p&gt;Features:&lt;br/&gt;
  Keyed - Tasks are submitted under a key.  The keys serve to prevent tasks for a given key from&lt;br/&gt;
          executing simultaneously.  Tasks submitted under different keys may run concurrently.&lt;/p&gt;

&lt;p&gt;  Queued - If a task is submitted for a key and another task is already running for that key, it&lt;br/&gt;
           is queued.  I.e. tasks are run in FIFO order for a key.&lt;/p&gt;

&lt;p&gt;  Thread Safe - This is a thread safe type.  Any number of callers may invoke the public api&lt;br/&gt;
                methods simultaneously.&lt;/p&gt;

&lt;p&gt;Special Enhancements:&lt;br/&gt;
  onCurrentTasksDrained- Invoking this method for a key allows a caller to wait until all of the&lt;br/&gt;
                         currently queued tasks for that key have completed.&lt;/p&gt;

&lt;p&gt;  onAllCurrentTasksDrained- Invoking this method allows a caller to wait until all of the&lt;br/&gt;
                            currently queued tasks for all key have completed.&lt;/p&gt;

&lt;p&gt;  KeyedExecutorRetry - Throwing or returning KeyedExecutorRetry in a task will cause the task to&lt;br/&gt;
                       be requeued immediately into the executor and retain its place in the&lt;br/&gt;
                       queue.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 333fdd10e3981ef3938dc4a6b5807f2f2da95110)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca5ef64366acf031f501ddd3e58d94462cfd811e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca5ef64366acf031f501ddd3e58d94462cfd811e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1901840" author="xgen-internal-githook" created="Fri, 25 May 2018 15:17:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;hanumantmk&apos;, &apos;name&apos;: &apos;Jason Carey&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35055&quot; title=&quot;KeyedExecutor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35055&quot;&gt;&lt;del&gt;SERVER-35055&lt;/del&gt;&lt;/a&gt; keyed executor&lt;/p&gt;

&lt;p&gt;This is a thread safe execution primitive for running jobs against an executor with mutual&lt;br/&gt;
exclusion and queuing by key.&lt;/p&gt;

&lt;p&gt;Features:&lt;br/&gt;
  Keyed - Tasks are submitted under a key.  The keys serve to prevent tasks for a given key from&lt;br/&gt;
          executing simultaneously.  Tasks submitted under different keys may run concurrently.&lt;/p&gt;

&lt;p&gt;  Queued - If a task is submitted for a key and another task is already running for that key, it&lt;br/&gt;
           is queued.  I.e. tasks are run in FIFO order for a key.&lt;/p&gt;

&lt;p&gt;  Thread Safe - This is a thread safe type.  Any number of callers may invoke the public api&lt;br/&gt;
                methods simultaneously.&lt;/p&gt;

&lt;p&gt;Special Enhancements:&lt;br/&gt;
  onCurrentTasksDrained- Invoking this method for a key allows a caller to wait until all of the&lt;br/&gt;
                         currently queued tasks for that key have completed.&lt;/p&gt;

&lt;p&gt;  onAllCurrentTasksDrained- Invoking this method allows a caller to wait until all of the&lt;br/&gt;
                            currently queued tasks for all key have completed.&lt;/p&gt;

&lt;p&gt;  KeyedExecutorRetry - Throwing or returning KeyedExecutorRetry in a task will cause the task to&lt;br/&gt;
                       be requeued immediately into the executor and retain its place in the&lt;br/&gt;
                       queue.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/333fdd10e3981ef3938dc4a6b5807f2f2da95110&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/333fdd10e3981ef3938dc4a6b5807f2f2da95110&lt;/a&gt;&lt;/p&gt;</comment>
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