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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-53017] replSetGetStatus remainingInitialSyncEstimatedMillis always 0</title>
                <link>https://jira.mongodb.org/browse/SERVER-53017</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is related to the new metrics in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47863&quot; title=&quot;Initial Sync Progress Metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47863&quot;&gt;&lt;del&gt;SERVER-47863&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;After calling &lt;tt&gt;db.adminCommand({ replSetGetStatus: 1, initialSync: 1 }).initialSyncStatus.remainingInitialSyncEstimatedMillis&lt;/tt&gt;, sometimes this will return a value &lt;em&gt;before&lt;/em&gt; data starts copying, but once data begins to copy the value is always 0.&lt;/p&gt;



&lt;p&gt;Tested on mongod-4.9.0-alpha-596-g4437864&lt;/p&gt;</description>
                <environment></environment>
        <key id="1549545">SERVER-53017</key>
            <summary>replSetGetStatus remainingInitialSyncEstimatedMillis always 0</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="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="jason.chan@mongodb.com">Jason Chan</assignee>
                                    <reporter username="alex.bevilacqua@mongodb.com">Alex Bevilacqua</reporter>
                        <labels>
                    </labels>
                <created>Sun, 22 Nov 2020 16:22:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:08 +0000</updated>
                            <resolved>Wed, 2 Dec 2020 00:54:43 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.4.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3517199" author="xgen-internal-githook" created="Fri, 4 Dec 2020 22:35:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@mongodb.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53017&quot; title=&quot;replSetGetStatus remainingInitialSyncEstimatedMillis always 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53017&quot;&gt;&lt;del&gt;SERVER-53017&lt;/del&gt;&lt;/a&gt; Make sure download rate is calculated as a double when calculating remainingInitialSyncEstimatedMillis&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 020703354ed815471613c8ae70fbf71c83f3bd1e)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2508a2d18cb3c6ed85a29437a294f467f49216a0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2508a2d18cb3c6ed85a29437a294f467f49216a0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3511678" author="xgen-internal-githook" created="Wed, 2 Dec 2020 00:53:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@mongodb.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53017&quot; title=&quot;replSetGetStatus remainingInitialSyncEstimatedMillis always 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53017&quot;&gt;&lt;del&gt;SERVER-53017&lt;/del&gt;&lt;/a&gt; Make sure download rate is calculated as a double when calculating remainingInitialSyncEstimatedMillis&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/020703354ed815471613c8ae70fbf71c83f3bd1e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/020703354ed815471613c8ae70fbf71c83f3bd1e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3509013" author="jason.chan" created="Mon, 30 Nov 2020 19:24:28 +0000"  >&lt;p&gt;Took a deeper look into this and I think I figured out the problem. We calculate &lt;tt&gt;remainingInitialSyncEstimatedMillis&lt;/tt&gt; with the following operation: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0c24ef9819b04b913e85043a4b3817c21f171fa8/src/mongo/db/repl/initial_syncer.cpp#L432-L434&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;(totalInitialSyncElapsedMillis / approxTotalBytesCopied) * (approxTotalDataSize - approxTotalBytesCopied)&lt;/a&gt;. We are calculating the product of &lt;tt&gt;(totalInitialSyncElapsedMillis / approxTotalBytesCopied)&lt;/tt&gt; as a non-decimal type, this will return 0 when &lt;tt&gt;approxTotalBytesCopied&lt;/tt&gt; is sufficiently large. We should instead calculate this step using a &lt;tt&gt;double&lt;/tt&gt; so the mid-result does not round down to 0.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="2162229">SERVER-70686</issuekey>
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