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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>
    </build-info>


<item>
            <title>[SERVER-31193] initial sync collection clone progress goes above 100%</title>
                <link>https://jira.mongodb.org/browse/SERVER-31193</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Initial sync collection clone progress can go above 100% sometimes&lt;/p&gt;
&lt;p/&gt;
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					&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;...&lt;/span&gt;&lt;/pre&gt;
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					&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:41:35.607+0000 I -        [repl writer worker 7]   logs.task_logg collection clone progress: 176056703/181002659 97% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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					&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:44:03.085+0000 I -        [repl writer worker 7]   logs.task_logg collection clone progress: 178395481/181002659 98% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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					&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:46:47.082+0000 I -        [repl writer worker 8]   logs.task_logg collection clone progress: 180586508/181002659 99% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:49:30.019+0000 I -        [repl writer worker 8]   logs.task_logg collection clone progress: 182639239/181002659 100% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:50:52.630+0000 I -        [repl writer worker 8]   logs.task_logg collection clone progress: 183469037/181002659 101% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:51:52.210+0000 I -        [repl writer worker 8]   logs.task_logg collection clone progress: 184232500/181002659 101% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:53:02.187+0000 I -        [repl writer worker 8]   logs.task_logg collection clone progress: 185050359/181002659 102% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:54:28.684+0000 I -        [repl writer worker 5]   logs.task_logg collection clone progress: 186264701/181002659 102% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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				&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:55:35.874+0000 I -        [repl writer worker 5]   logs.task_logg collection clone progress: 187067096/181002659 103% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:57:21.672+0000 I -        [repl writer worker 4]   logs.task_logg collection clone progress: 188209948/181002659 103% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T10:58:46.080+0000 I -        [repl writer worker 4]   logs.task_logg collection clone progress: 189385860/181002659 104% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T11:00:02.865+0000 I -        [repl writer worker 4]   logs.task_logg collection clone progress: 190523332/181002659 105% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T11:01:20.087+0000 I -        [repl writer worker 4]   logs.task_logg collection clone progress: 191835349/181002659 105% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T11:02:28.444+0000 I -        [repl writer worker 4]   logs.task_logg collection clone progress: 193119747/181002659 106% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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						&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;mongodb.log.2017-09-20T19-08-46:2017-09-20T11:03:47.338+0000 I -        [repl writer worker 4]   logs.task_logg collection clone progress: 194298584/181002659 107% (documents copied)&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This collection had a lot of documents so initial sync took a few hours (~16) and it seems that it grew by 7% within that time period. The total number of documents to copy wasn&apos;t updated since the initial sync started though resulting in inaccurate progress % info. &lt;/p&gt;</description>
                <environment></environment>
        <key id="430131">SERVER-31193</key>
            <summary>initial sync collection clone progress goes above 100%</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="13202">Works as Designed</resolution>
                                        <assignee username="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="zakhar.kleyman@mongodb.com">Zakhar Kleyman</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Sep 2017 21:26:02 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:13 +0000</updated>
                            <resolved>Tue, 3 Oct 2017 19:27:51 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1684440" author="william.schultz" created="Thu, 28 Sep 2017 16:58:12 +0000"  >&lt;p&gt;There are two relevant pieces of data that are used by the CollectionCloner when calculating its cloning progress: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2203abc793e888e1c7b281b8bf213e0fd0446795/src/mongo/db/repl/collection_cloner.h#L83&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;b&gt;documentsCopied&lt;/b&gt;&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2203abc793e888e1c7b281b8bf213e0fd0446795/src/mongo/db/repl/collection_cloner.h#L82&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;b&gt;documentsToCopy&lt;/b&gt;&lt;/a&gt;.  The first value, &lt;tt&gt;documentsCopied&lt;/tt&gt;, is a precise and meaningful quantity: it is the exact number of documents that have been copied from the sync source since the beginning of the collection cloning process. The quantity &lt;tt&gt;documentsToCopy&lt;/tt&gt;, however, is less precise, and is more of an approximation. The &lt;tt&gt;documentsToCopy&lt;/tt&gt; value is set at the beginning of collection cloning by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d296e1dfed119fb3ef9d4907ac1875480f1408c8/src/mongo/db/repl/collection_cloner.cpp#L337&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;counting the number of documents in the remote collection&lt;/a&gt;. During the collection cloning process, however, the number of documents in the remote collection may increase &lt;em&gt;or&lt;/em&gt; decrease, depending on whether there are documents being inserted to or deleted from the sync source&apos;s collection. In theory, the correct value for &lt;tt&gt;documentsToCopy&lt;/tt&gt; would be the final number of documents actually copied i.e. the value of &lt;tt&gt;documentsCopied&lt;/tt&gt; when cloning has finished. That future value, though, is impossible to know. There is no way to compute the exact cloning progress, since there is no way to know how many future inserts or deletes will occur during the cloning process. Because of this fact (which is inherent to the cloning process itself) it should be possible to see a clone progress that exceeds 100%, or to see a clone that finishes with a progress percentage less than 100%. &lt;/p&gt;

&lt;p&gt;You can see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dd7db706f88d15d783d28ecd5b1c487c378819f3/src/mongo/util/progress_meter.cpp#L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; where the actual progress percentage is calculated. It uses &lt;tt&gt;_done/_total * 100&lt;/tt&gt; as the progress percentage. &lt;tt&gt;_done&lt;/tt&gt; is updated with the &lt;tt&gt;_documentsCopied&lt;/tt&gt; value every time new documents arrive, and &lt;tt&gt;_total&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d296e1dfed119fb3ef9d4907ac1875480f1408c8/src/mongo/db/repl/collection_cloner.cpp#L337&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is set&lt;/a&gt; to &lt;tt&gt;_documentToCopy&lt;/tt&gt; at the beginning of the collection clone.&lt;/p&gt;

&lt;p&gt;In the future it may help users if we make it clearer that this progress value is to be considered an approximation, to alleviate confusion.&lt;/p&gt;</comment>
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