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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>[GODRIVER-1799] Avoiding connection storms</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-1799</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;    See DRIVERS-781 for updated details.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1545445">GODRIVER-1799</key>
            <summary>Avoiding connection storms</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="matt.dale@mongodb.com">Matt Dale</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Nov 2020 20:14:07 +0000</created>
                <updated>Sat, 28 Oct 2023 11:37:59 +0000</updated>
                            <resolved>Tue, 22 Mar 2022 13:59:26 +0000</resolved>
                                                    <fixVersion>1.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4311166" author="dbeng-pm-bot" created="Tue, 25 Jan 2022 01:27:47 +0000"  >&lt;p&gt;If you are not logged in, you can view the tickets in this epic by following &lt;a href=&quot;https://jira.mongodb.org/issues/?jql=%22Epic%20Link%22%20%3D%20GODRIVER-1799&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this link&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4284666" author="dbeng-pm-bot" created="Tue, 11 Jan 2022 01:42:43 +0000"  >&lt;p&gt;If you are not logged in, you can view the tickets in this epic by following &lt;a href=&quot;https://jira.mongodb.org/issues/?jql=%22Epic%20Link%22%20%3D%20GODRIVER-1799&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this link&lt;/a&gt;.&lt;/p&gt;</comment>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1620794">GODRIVER-1885</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1798905">GODRIVER-2065</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1766841">GODRIVER-2038</issuekey>
        </issuelink>
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                            <customfieldvalue>15 weeks</customfieldvalue>


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                            <customfieldvalue>&lt;p&gt;Engineer(s): Matt&lt;/p&gt;

&lt;p&gt;2022-03-07: Updated target end date to 2022-03-18&lt;/p&gt;

&lt;p&gt;Status update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Completed connection pool pausing.&lt;/li&gt;
	&lt;li&gt;Updates to resync maxConnecting related tests in review.&lt;/li&gt;
	&lt;li&gt;Consider server load during server selection is scheduled.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Rationale for delays:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Connection pool pausing was more complex than expected.&lt;/li&gt;
	&lt;li&gt;Go driver connection pool behavior differs from most other drivers. The Go driver establishes all connections in a background goroutines (part of &lt;a href=&quot;https://jira.mongodb.org/browse/GODRIVER-2038&quot; title=&quot;Use &amp;quot;ConnectionTimeout&amp;quot; for creating all new connections and background connection creation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;GODRIVER-2038&quot;&gt;&lt;del&gt;GODRIVER-2038&lt;/del&gt;&lt;/a&gt;). This resulted in three CMAP tests not being able to work with the Go driver. Drivers tickets were filed.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Risks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No risks.&lt;/li&gt;
&lt;/ul&gt;


&lt;hr /&gt;

&lt;p&gt;2022-02-21: Updating target date to 2022-03-01.&lt;/p&gt;

&lt;p&gt;Status update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Connection pool pausing in review.
	&lt;ul&gt;
		&lt;li&gt;Met to discuss PR. 1 of 3 reviewers have approved.&lt;/li&gt;
		&lt;li&gt;Resolved an intermittent test failure.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Rationale for delays:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Reviews have been slower. Team busy on hiring and responding to questions in #go-driver.&lt;/li&gt;
	&lt;li&gt;Discovered an intermittent test failure during PR.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Risks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No risks.&lt;/li&gt;
&lt;/ul&gt;


&lt;hr /&gt;

&lt;p&gt;2022-02-07: Updated target end date to 2022-02-18&lt;/p&gt;

&lt;p&gt;Status update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Connection pool pausing in review.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Rationale for delays:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Connection pool pausing implementation was unexpectedly challenging. Required refactor of operation layer to permit retry of connection pool checkout.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Risks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No risks.&lt;/li&gt;
&lt;/ul&gt;


&lt;hr /&gt;
&lt;p&gt;2022-01-25: No change to target date&lt;/p&gt;

&lt;p&gt;Status update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Focus is on implementing pausable state for pool, which will unblock many spec tests.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Rationale for delays:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No delays.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Risks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No risks.&lt;/li&gt;
&lt;/ul&gt;


&lt;hr /&gt;

&lt;p&gt;2022-01-11: No change to target date&lt;/p&gt;

&lt;p&gt;Status update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;PR for prose-style tests for the maxConnecting CMAP spec approved. Fixing test failures.&lt;/li&gt;
	&lt;li&gt;Configurable maxConnecting released in 1.8.2.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Rationale for delays:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No delays.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Risks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No risks.&lt;/li&gt;
&lt;/ul&gt;


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

&lt;p&gt;2021-12-27: No change to target date.&lt;/p&gt;

&lt;p&gt;Status update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;PR for prose-style tests for the maxConnecting CMAP spec.&lt;/li&gt;
	&lt;li&gt;Spec tests were not possible to run in Go driver since it relied on private API unavailable to integration test runner.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Rationale for delays:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No delays.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Risks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No risks.&lt;/li&gt;
&lt;/ul&gt;


&lt;hr /&gt;
&lt;p&gt;2021-12-13:&lt;/p&gt;

&lt;p&gt;Status update:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Working on maxConnecting and rate limiting.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Rationale for delays:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No delays.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Risks:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;No risks.&lt;/li&gt;
&lt;/ul&gt;


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