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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-53228] 4.4.2  Sharded clusters using nearest has difference explain plan from primary and secondary</title>
                <link>https://jira.mongodb.org/browse/SERVER-53228</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;hi:&lt;/p&gt;

&lt;p&gt;&#160; i have mongodb 4.4.2&#160;Sharded clusters including one shard.i test nearest.when sql direct to primary using IXSCAN,secondary using&#160;COUNT_SCAN.the following is my test:&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; db.getMongo().setReadPref(&apos;nearest&apos;)&lt;br/&gt;
mongos&amp;gt; db.POCCOLL.count({fld3:&quot;invidunt ut labore et dolore&quot;})&lt;br/&gt;
2695802&lt;br/&gt;
mongos&amp;gt;&lt;/p&gt;

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

&lt;p&gt;from primary logs:&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;&amp;nbsp;&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;{&quot;t&quot;:\{&quot;$date&quot;:&quot;2020-12-04T17:15:07.841+08:00&quot;},&quot;s&quot;:&quot;I&quot;, &quot;c&quot;:&quot;COMMAND&quot;, &quot;id&quot;:51803, &quot;ctx&quot;:&quot;conn1969&quot;,&quot;msg&quot;:&quot;Slow query&quot;,&quot;attr&quot;:\{&quot;type&quot;:&quot;command&quot;,&quot;ns&quot;:&quot;POCDB.POCCOLL&quot;,&quot;appName&quot;:&quot;MongoDB Shell&quot;,&quot;command&quot;:{&quot;count&quot;:&quot;POCCOLL&quot;,&quot;query&quot;:{&quot;fld3&quot;:&quot;invidunt ut labore et dolore&quot;},&quot;readConcern&quot;:\{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;shardVersion&quot;:[\{&quot;$timestamp&quot;:{&quot;t&quot;:1,&quot;i&quot;:2894}},\{&quot;$oid&quot;:&quot;5fc737fe7209449001f7369d&quot;}],&quot;clientOperationKey&quot;:\{&quot;$uuid&quot;:&quot;f0fa77d1-9ebb-40fa-bad5-fbc18251052a&quot;},&quot;lsid&quot;:\{&quot;id&quot;:{&quot;$uuid&quot;:&quot;3acac26a-0f29-414a-a339-b8b43cc66e69&quot;},&quot;uid&quot;:\{&quot;$binary&quot;:{&quot;base64&quot;:&quot;O0CMtIVItQN4IsEOsJdrPL8s7jv5xwh5a/A5Qfvs2A8=&quot;,&quot;subType&quot;:&quot;0&quot;}}},&quot;maxTimeMSOpOnly&quot;:120,&quot;$readPreference&quot;:\{&quot;mode&quot;:&quot;nearest&quot;,&quot;hedge&quot;:{&quot;enabled&quot;:true}},&quot;$clusterTime&quot;:\{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607073306,&quot;i&quot;:1}},&quot;signature&quot;:\{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;XszqboCQ7DhMofAB6xOzk39BdJk=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:6901213159848149013}},&quot;$audit&quot;:\{&quot;$impersonatedUsers&quot;:[{&quot;user&quot;:&quot;admin&quot;,&quot;db&quot;:&quot;admin&quot;}],&quot;$impersonatedRoles&quot;:[\{&quot;role&quot;:&quot;root&quot;,&quot;db&quot;:&quot;admin&quot;}]},&quot;$client&quot;:\{&quot;application&quot;:{&quot;name&quot;:&quot;MongoDB Shell&quot;},&quot;driver&quot;:\{&quot;name&quot;:&quot;MongoDB Internal Client&quot;,&quot;version&quot;:&quot;4.4.2&quot;},&quot;os&quot;:\{&quot;type&quot;:&quot;Linux&quot;,&quot;name&quot;:&quot;CentOS Linux release 7.4.1708 (Core) &quot;,&quot;architecture&quot;:&quot;x86_64&quot;,&quot;version&quot;:&quot;Kernel 3.10.0-693.21.1.el7.x86_64&quot;},&quot;mongos&quot;:\{&quot;host&quot;:&quot;vmt20130:31051&quot;,&quot;client&quot;:&quot;10.130.9.150:60544&quot;,&quot;version&quot;:&quot;4.4.2&quot;}},&quot;$configServerState&quot;:\{&quot;opTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607073306,&quot;i&quot;:1}},&quot;t&quot;:3}},&quot;$db&quot;:&quot;POCDB&quot;},&quot;planSummary&quot;:&quot;IXSCAN \{ fld3: 1 }&quot;,&quot;numYields&quot;:7,&quot;queryHash&quot;:&quot;97EEEEB2&quot;,&quot;planCacheKey&quot;:&quot;EC620B13&quot;,&quot;ok&quot;:0,&quot;errMsg&quot;:&quot;Exec error resulting in state FAILURE :: caused by :: operation exceeded time limit&quot;,&quot;errName&quot;:&quot;MaxTimeMSExpired&quot;,&quot;errCode&quot;:50,&quot;reslen&quot;:450,&quot;locks&quot;:\{&quot;ReplicationStateTransition&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:8}},&quot;Global&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:8}},&quot;Database&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:8}},&quot;Collection&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:8}},&quot;Mutex&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:3}}},&quot;readConcern&quot;:\{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;protocol&quot;:&quot;op_msg&quot;,&quot;durationMillis&quot;:148}}&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;&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;&#160;&lt;/p&gt;

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

&lt;p&gt;from secondary logs:&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;&amp;nbsp;&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;{&quot;t&quot;:\{&quot;$date&quot;:&quot;2020-12-04T17:15:08.812+08:00&quot;},&quot;s&quot;:&quot;I&quot;, &quot;c&quot;:&quot;COMMAND&quot;, &quot;id&quot;:51803, &quot;ctx&quot;:&quot;conn1913&quot;,&quot;msg&quot;:&quot;Slow query&quot;,&quot;attr&quot;:\{&quot;type&quot;:&quot;command&quot;,&quot;ns&quot;:&quot;POCDB.POCCOLL&quot;,&quot;appName&quot;:&quot;MongoDB Shell&quot;,&quot;command&quot;:{&quot;count&quot;:&quot;POCCOLL&quot;,&quot;query&quot;:{&quot;fld3&quot;:&quot;invidunt ut labore et dolore&quot;},&quot;readConcern&quot;:\{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;shardVersion&quot;:[\{&quot;$timestamp&quot;:{&quot;t&quot;:1,&quot;i&quot;:2894}},\{&quot;$oid&quot;:&quot;5fc737fe7209449001f7369d&quot;}],&quot;clientOperationKey&quot;:\{&quot;$uuid&quot;:&quot;f0fa77d1-9ebb-40fa-bad5-fbc18251052a&quot;},&quot;lsid&quot;:\{&quot;id&quot;:{&quot;$uuid&quot;:&quot;3acac26a-0f29-414a-a339-b8b43cc66e69&quot;},&quot;uid&quot;:\{&quot;$binary&quot;:{&quot;base64&quot;:&quot;O0CMtIVItQN4IsEOsJdrPL8s7jv5xwh5a/A5Qfvs2A8=&quot;,&quot;subType&quot;:&quot;0&quot;}}},&quot;$readPreference&quot;:\{&quot;mode&quot;:&quot;nearest&quot;,&quot;hedge&quot;:{&quot;enabled&quot;:true}},&quot;$clusterTime&quot;:\{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607073306,&quot;i&quot;:1}},&quot;signature&quot;:\{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;XszqboCQ7DhMofAB6xOzk39BdJk=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:6901213159848149013}},&quot;$audit&quot;:\{&quot;$impersonatedUsers&quot;:[{&quot;user&quot;:&quot;admin&quot;,&quot;db&quot;:&quot;admin&quot;}],&quot;$impersonatedRoles&quot;:[\{&quot;role&quot;:&quot;root&quot;,&quot;db&quot;:&quot;admin&quot;}]},&quot;$client&quot;:\{&quot;application&quot;:{&quot;name&quot;:&quot;MongoDB Shell&quot;},&quot;driver&quot;:\{&quot;name&quot;:&quot;MongoDB Internal Client&quot;,&quot;version&quot;:&quot;4.4.2&quot;},&quot;os&quot;:\{&quot;type&quot;:&quot;Linux&quot;,&quot;name&quot;:&quot;CentOS Linux release 7.4.1708 (Core) &quot;,&quot;architecture&quot;:&quot;x86_64&quot;,&quot;version&quot;:&quot;Kernel 3.10.0-693.21.1.el7.x86_64&quot;},&quot;mongos&quot;:\{&quot;host&quot;:&quot;vmt20130:31051&quot;,&quot;client&quot;:&quot;10.130.9.150:60544&quot;,&quot;version&quot;:&quot;4.4.2&quot;}},&quot;$configServerState&quot;:\{&quot;opTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607073306,&quot;i&quot;:1}},&quot;t&quot;:3}},&quot;$db&quot;:&quot;POCDB&quot;},&quot;planSummary&quot;:&quot;COUNT_SCAN \{ fld3: 1 }&quot;,&quot;keysExamined&quot;:2695803,&quot;docsExamined&quot;:0,&quot;numYields&quot;:2695,&quot;queryHash&quot;:&quot;97EEEEB2&quot;,&quot;planCacheKey&quot;:&quot;EC620B13&quot;,&quot;reslen&quot;:320,&quot;locks&quot;:\{&quot;ReplicationStateTransition&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:2696}},&quot;Global&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:2696}},&quot;Database&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:2696}},&quot;Collection&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:2696}},&quot;Mutex&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:1}}},&quot;readConcern&quot;:\{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;storage&quot;:\{&quot;data&quot;:{&quot;bytesRead&quot;:10114025,&quot;timeReadingMicros&quot;:18241}},&quot;protocol&quot;:&quot;op_msg&quot;,&quot;durationMillis&quot;:1120}}&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;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="1559399">SERVER-53228</key>
            <summary>4.4.2  Sharded clusters using nearest has difference explain plan from primary and secondary</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="9">Done</resolution>
                                        <assignee username="eric.sedor@mongodb.com">Eric Sedor</assignee>
                                    <reporter username="601290552@qq.com">jing xu</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Dec 2020 09:17:14 +0000</created>
                <updated>Mon, 15 Mar 2021 23:02:06 +0000</updated>
                            <resolved>Mon, 15 Mar 2021 23:02:06 +0000</resolved>
                                                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3665748" author="eric.sedor" created="Mon, 15 Mar 2021 23:01:58 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to close this ticket. If this is still an issue for you, please clarify how else we can help and we can reopen the ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Eric&lt;/p&gt;</comment>
                            <comment id="3531664" author="eric.sedor" created="Wed, 16 Dec 2020 00:19:34 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=601290552%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;601290552@qq.com&quot;&gt;601290552@qq.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Currently this is expected behavior for &lt;a href=&quot;https://docs.mongodb.com/manual/reference/read-concern/#read-concern-levels&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;readConcern &quot;available&quot;&lt;/a&gt;, which is the default readConcern for Secondary reads that aren&apos;t part of causally consistent sessions. The &quot;available&quot; readConcern allows the return of orphan documents, which allows COUNT_SCAN to be used. By contrast, the Primary read uses a readConcern of &quot;local&quot; and a plan involving an IXSCAN (as of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3645&quot; title=&quot;Sharded collection counts (on primary) can report too many results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3645&quot;&gt;&lt;del&gt;SERVER-3645&lt;/del&gt;&lt;/a&gt;), so as to filter orphaned documents.&lt;/p&gt;

&lt;p&gt;You should see similar plan selection if you explicitly specify a readConcern of &quot;local&quot;.&lt;/p&gt;

&lt;p&gt;Does this make sense?&lt;/p&gt;</comment>
                            <comment id="3515855" author="601290552@qq.com" created="Fri, 4 Dec 2020 09:18:40 +0000"  >&lt;p&gt;mongos:&lt;br/&gt;
mongos&amp;gt; sh.status();&lt;br/&gt;
&amp;#8212; Sharding Status &amp;#8212; &lt;br/&gt;
  sharding version: &lt;/p&gt;
{
  	&quot;_id&quot; : 1,
  	&quot;minCompatibleVersion&quot; : 5,
  	&quot;currentVersion&quot; : 6,
  	&quot;clusterId&quot; : ObjectId(&quot;5fc608cefcbcbec36d4f785d&quot;)
  }
&lt;p&gt;  shards:&lt;/p&gt;
        {  &quot;_id&quot; : &quot;shard1&quot;,  &quot;host&quot; : &quot;shard1/10.130.10.149:31001,10.130.10.150:31001,10.130.9.150:31001&quot;,  &quot;state&quot; : 1 }
&lt;p&gt;  active mongoses:&lt;br/&gt;
        &quot;4.4.2&quot; : 1&lt;br/&gt;
  autosplit:&lt;br/&gt;
        Currently enabled: yes&lt;br/&gt;
  balancer:&lt;br/&gt;
        Currently enabled:  yes&lt;br/&gt;
        Currently running:  no&lt;br/&gt;
        Failed balancer rounds in last 5 attempts:  5&lt;br/&gt;
        Last reported error:  Couldn&apos;t get a connection within the time limit of 4ms&lt;br/&gt;
        Time of Reported error:  Wed Dec 02 2020 15:27:05 GMT+0800 (CST)&lt;br/&gt;
        Migration Results for the last 24 hours: &lt;br/&gt;
                No recent migrations&lt;br/&gt;
  databases:&lt;br/&gt;
        {  &quot;_id&quot; : &quot;POCDB&quot;,  &quot;primary&quot; : &quot;shard1&quot;,  &quot;partitioned&quot; : true,  &quot;version&quot; : &lt;/p&gt;
{  &quot;uuid&quot; : UUID(&quot;84c6bc81-017f-4174-a59a-72551083b7c4&quot;),  &quot;lastMod&quot; : 1 }
&lt;p&gt; }&lt;br/&gt;
                POCDB.POCCOLL&lt;br/&gt;
                        shard key: &lt;/p&gt;
{ &quot;_id&quot; : 1 }
&lt;p&gt;                        unique: false&lt;br/&gt;
                        balancing: true&lt;br/&gt;
                        chunks:&lt;br/&gt;
                                shard1	1448&lt;br/&gt;
                        too many chunks to print, use verbose if you want to force print&lt;/p&gt;
        {  &quot;_id&quot; : &quot;config&quot;,  &quot;primary&quot; : &quot;config&quot;,  &quot;partitioned&quot; : true }
&lt;p&gt;                config.system.sessions&lt;br/&gt;
                        shard key: &lt;/p&gt;
{ &quot;_id&quot; : 1 }
&lt;p&gt;                        unique: false&lt;br/&gt;
                        balancing: true&lt;br/&gt;
                        chunks:&lt;br/&gt;
                                shard1	1024&lt;br/&gt;
                        too many chunks to print, use verbose if you want to force print&lt;/p&gt;


&lt;p&gt;from primary logs:&lt;/p&gt;

&lt;p&gt;keysExamined&quot;:1921679,&quot;docsExamined&quot;:1921679&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;{&quot;t&quot;:\{&quot;$date&quot;:&quot;2020-12-04T15:48:28.824+08:00&quot;},&quot;s&quot;:&quot;I&quot;, &quot;c&quot;:&quot;COMMAND&quot;, &quot;id&quot;:51803, &quot;ctx&quot;:&quot;conn1944&quot;,&quot;msg&quot;:&quot;Slow query&quot;,&quot;attr&quot;:\{&quot;type&quot;:&quot;command&quot;,&quot;ns&quot;:&quot;POCDB.POCCOLL&quot;,&quot;appName&quot;:&quot;MongoDB Shell&quot;,&quot;command&quot;:{&quot;count&quot;:&quot;POCCOLL&quot;,&quot;query&quot;:{&quot;fld3&quot;:&quot;voluptua. At vero eos et&quot;},&quot;readConcern&quot;:\{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;shardVersion&quot;:[\{&quot;$timestamp&quot;:{&quot;t&quot;:1,&quot;i&quot;:2894}},\{&quot;$oid&quot;:&quot;5fc737fe7209449001f7369d&quot;}],&quot;clientOperationKey&quot;:\{&quot;$uuid&quot;:&quot;b3f975da-b930-40ac-82b6-e95933367fbe&quot;},&quot;lsid&quot;:\{&quot;id&quot;:{&quot;$uuid&quot;:&quot;3acac26a-0f29-414a-a339-b8b43cc66e69&quot;},&quot;uid&quot;:\{&quot;$binary&quot;:{&quot;base64&quot;:&quot;O0CMtIVItQN4IsEOsJdrPL8s7jv5xwh5a/A5Qfvs2A8=&quot;,&quot;subType&quot;:&quot;0&quot;}}},&quot;$readPreference&quot;:\{&quot;mode&quot;:&quot;nearest&quot;,&quot;hedge&quot;:{&quot;enabled&quot;:true}},&quot;$clusterTime&quot;:\{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607068038,&quot;i&quot;:1}},&quot;signature&quot;:\{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;+QDnZt9ACtbP1rZ40QDD+GAjF4Q=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:6901213159848149013}},&quot;$audit&quot;:\{&quot;$impersonatedUsers&quot;:[{&quot;user&quot;:&quot;admin&quot;,&quot;db&quot;:&quot;admin&quot;}],&quot;$impersonatedRoles&quot;:[\{&quot;role&quot;:&quot;root&quot;,&quot;db&quot;:&quot;admin&quot;}]},&quot;$client&quot;:\{&quot;application&quot;:{&quot;name&quot;:&quot;MongoDB Shell&quot;},&quot;driver&quot;:\{&quot;name&quot;:&quot;MongoDB Internal Client&quot;,&quot;version&quot;:&quot;4.4.2&quot;},&quot;os&quot;:\{&quot;type&quot;:&quot;Linux&quot;,&quot;name&quot;:&quot;CentOS Linux release 7.4.1708 (Core) &quot;,&quot;architecture&quot;:&quot;x86_64&quot;,&quot;version&quot;:&quot;Kernel 3.10.0-693.21.1.el7.x86_64&quot;},&quot;mongos&quot;:\{&quot;host&quot;:&quot;vmt20130:31051&quot;,&quot;client&quot;:&quot;10.130.9.150:60544&quot;,&quot;version&quot;:&quot;4.4.2&quot;}},&quot;$configServerState&quot;:\{&quot;opTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607068038,&quot;i&quot;:1}},&quot;t&quot;:3}},&quot;$db&quot;:&quot;POCDB&quot;},&quot;planSummary&quot;:&quot;IXSCAN \{ fld3: 1 }&quot;,&quot;keysExamined&quot;:1921679,&quot;docsExamined&quot;:1921679,&quot;numYields&quot;:3685,&quot;queryHash&quot;:&quot;97EEEEB2&quot;,&quot;planCacheKey&quot;:&quot;EC620B13&quot;,&quot;reslen&quot;:340,&quot;locks&quot;:\{&quot;ReplicationStateTransition&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:3686}},&quot;Global&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:3686}},&quot;Database&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:3686}},&quot;Collection&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:3686}},&quot;Mutex&quot;:\{&quot;acquireCount&quot;:{&quot;r&quot;:3}}},&quot;readConcern&quot;:\{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;storage&quot;:\{&quot;data&quot;:{&quot;bytesRead&quot;:46099281443,&quot;timeReadingMicros&quot;:55325725},&quot;timeWaitingMicros&quot;:\{&quot;cache&quot;:6134}},&quot;protocol&quot;:&quot;op_msg&quot;,&quot;durationMillis&quot;:69229}}&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;&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;from secondary logs:&lt;br/&gt;
&quot;keysExamined&quot;:2695803,&quot;docsExamined&quot;:0,&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;{&quot;t&quot;:{&quot;$date&quot;:&quot;2020-12-04T17:15:08.812+08:00&quot;},&quot;s&quot;:&quot;I&quot;,  &quot;c&quot;:&quot;COMMAND&quot;,  &quot;id&quot;:51803,   &quot;ctx&quot;:&quot;conn1913&quot;,&quot;msg&quot;:&quot;Slow query&quot;,&quot;attr&quot;:{&quot;type&quot;:&quot;command&quot;,&quot;ns&quot;:&quot;POCDB.POCCOLL&quot;,&quot;appName&quot;:&quot;MongoDB Shell&quot;,&quot;command&quot;:{&quot;count&quot;:&quot;POCCOLL&quot;,&quot;query&quot;:{&quot;fld3&quot;:&quot;invidunt ut labore et dolore&quot;},&quot;readConcern&quot;:{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;shardVersion&quot;:[{&quot;$timestamp&quot;:{&quot;t&quot;:1,&quot;i&quot;:2894}},{&quot;$oid&quot;:&quot;5fc737fe7209449001f7369d&quot;}],&quot;clientOperationKey&quot;:{&quot;$uuid&quot;:&quot;f0fa77d1-9ebb-40fa-bad5-fbc18251052a&quot;},&quot;lsid&quot;:{&quot;id&quot;:{&quot;$uuid&quot;:&quot;3acac26a-0f29-414a-a339-b8b43cc66e69&quot;},&quot;uid&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;O0CMtIVItQN4IsEOsJdrPL8s7jv5xwh5a/A5Qfvs2A8=&quot;,&quot;subType&quot;:&quot;0&quot;}}},&quot;$readPreference&quot;:{&quot;mode&quot;:&quot;nearest&quot;,&quot;hedge&quot;:{&quot;enabled&quot;:true}},&quot;$clusterTime&quot;:{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607073306,&quot;i&quot;:1}},&quot;signature&quot;:{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;XszqboCQ7DhMofAB6xOzk39BdJk=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:6901213159848149013}},&quot;$audit&quot;:{&quot;$impersonatedUsers&quot;:[{&quot;user&quot;:&quot;admin&quot;,&quot;db&quot;:&quot;admin&quot;}],&quot;$impersonatedRoles&quot;:[{&quot;role&quot;:&quot;root&quot;,&quot;db&quot;:&quot;admin&quot;}]},&quot;$client&quot;:{&quot;application&quot;:{&quot;name&quot;:&quot;MongoDB Shell&quot;},&quot;driver&quot;:{&quot;name&quot;:&quot;MongoDB Internal Client&quot;,&quot;version&quot;:&quot;4.4.2&quot;},&quot;os&quot;:{&quot;type&quot;:&quot;Linux&quot;,&quot;name&quot;:&quot;CentOS Linux release 7.4.1708 (Core) &quot;,&quot;architecture&quot;:&quot;x86_64&quot;,&quot;version&quot;:&quot;Kernel 3.10.0-693.21.1.el7.x86_64&quot;},&quot;mongos&quot;:{&quot;host&quot;:&quot;vmt20130:31051&quot;,&quot;client&quot;:&quot;10.130.9.150:60544&quot;,&quot;version&quot;:&quot;4.4.2&quot;}},&quot;$configServerState&quot;:{&quot;opTime&quot;:{&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1607073306,&quot;i&quot;:1}},&quot;t&quot;:3}},&quot;$db&quot;:&quot;POCDB&quot;},&quot;planSummary&quot;:&quot;COUNT_SCAN { fld3: 1 }&quot;,&quot;keysExamined&quot;:2695803,&quot;docsExamined&quot;:0,&quot;numYields&quot;:2695,&quot;queryHash&quot;:&quot;97EEEEB2&quot;,&quot;planCacheKey&quot;:&quot;EC620B13&quot;,&quot;reslen&quot;:320,&quot;locks&quot;:{&quot;ReplicationStateTransition&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:2696}},&quot;Global&quot;:{&quot;acquireCount&quot;:{&quot;r&quot;:2696}},&quot;Database&quot;:{&quot;acquireCount&quot;:{&quot;r&quot;:2696}},&quot;Collection&quot;:{&quot;acquireCount&quot;:{&quot;r&quot;:2696}},&quot;Mutex&quot;:{&quot;acquireCount&quot;:{&quot;r&quot;:1}}},&quot;readConcern&quot;:{&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;storage&quot;:{&quot;data&quot;:{&quot;bytesRead&quot;:10114025,&quot;timeReadingMicros&quot;:18241}},&quot;protocol&quot;:&quot;op_msg&quot;,&quot;durationMillis&quot;:1120}}&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;&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;so is it a bug ?&lt;/p&gt;</comment>
                    </comments>
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