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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-41040] isMaster flag to initiate long-polling</title>
                <link>https://jira.mongodb.org/browse/SERVER-41040</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add a flag, perhaps &quot;maxTimeMS&quot;, to the isMaster command that initiates long-polling. The server will not respond until maxTimeMS expires or there is a server state change that might interest the client, such as a replica set member role change or a replica set config change.&lt;/p&gt;

&lt;p&gt;Also add a field, perhaps &quot;awaitedTimeMillis&quot;, to the reply, which is approximately the time the server waited between receiving the requested and assembling the reply. The client can subtract awaitedTimeMillis from the client&apos;s round trip latency measurement to estimate the network latency.&lt;/p&gt;</description>
                <environment></environment>
        <key id="759817">SERVER-41040</key>
            <summary>isMaster flag to initiate long-polling</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="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 May 2019 17:27:19 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:15 +0000</updated>
                            <resolved>Fri, 8 Nov 2019 20:24:43 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2526032" author="jesse" created="Fri, 8 Nov 2019 20:24:43 +0000"  >&lt;p&gt;This ticket was a useful prototype, it will not be merged.&lt;/p&gt;</comment>
                            <comment id="2243151" author="jesse" created="Fri, 10 May 2019 20:57:47 +0000"  >&lt;p&gt;The drivers send a few arguments with MS (maxTimeMS, maxStalenessMS) and the server replies consistently with Millis, I propose we make all new field names Millis, both in requests and replies.&lt;/p&gt;</comment>
                            <comment id="2243108" author="schwerin" created="Fri, 10 May 2019 20:32:18 +0000"  >&lt;p&gt;&quot;millis&quot; or &quot;ms&quot;? I can never remember what&apos;s consistent with other names&lt;br/&gt;
we use.&lt;/p&gt;

&lt;p&gt;On Fri, May 10, 2019, 3:19 PM A. Jesse Jiryu Davis (Jira) &amp;lt;jira@mongodb.org&amp;gt;&lt;/p&gt;
</comment>
                            <comment id="2242962" author="jesse" created="Fri, 10 May 2019 19:18:48 +0000"  >&lt;p&gt;I&apos;m choosing the parameter name &quot;awaitStatusChangeMillis&quot; for now.&lt;/p&gt;</comment>
                            <comment id="2242257" author="jesse" created="Fri, 10 May 2019 15:27:06 +0000"  >&lt;p&gt;OK. I was noticing in fact that this is brittle. If CmdIsMaster::run() waits for maxTimeMS before unblocking, then if any code on its path back up to the network layer calls checkForInterrupt() it will throw. I&apos;ll use some other parameter name, suggestions welcome.&lt;/p&gt;</comment>
                            <comment id="2241344" author="schwerin" created="Fri, 10 May 2019 14:04:36 +0000"  >&lt;p&gt;My memory on this is hazy, but I think the replication and query teams had some regrets about my decision to use maxTimeMS for that purpose on tailable cursor getMores.&lt;/p&gt;</comment>
                            <comment id="2241318" author="jesse" created="Fri, 10 May 2019 13:50:21 +0000"  >&lt;p&gt;OK, we do &lt;b&gt;not&lt;/b&gt; want consistency with how &quot;getMore&quot; uses maxTimeMS?&lt;/p&gt;</comment>
                            <comment id="2241267" author="schwerin" created="Fri, 10 May 2019 12:55:02 +0000"  >&lt;p&gt;I suggest not using maxTimeMS. Iirc, we have had problems in other long-poll scenarios conflating maxTimeMS with the concept of &quot;return without error after this time period&quot;.&lt;/p&gt;</comment>
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