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<channel>
    <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-32418] Due to a lag, query is very slow in the config server</title>
                <link>https://jira.mongodb.org/browse/SERVER-32418</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;System environment&lt;br/&gt;
System: CentOS release 6.6&lt;br/&gt;
Kernel: 2.6.32-504.el6.x86_64&lt;br/&gt;
Memory: 256G&lt;br/&gt;
Disk: SSD-PCIE&lt;br/&gt;
File System: xfs&lt;br/&gt;
mongo version: 3.4.10&lt;/p&gt;

&lt;p&gt;The config server has three members in my cluster, one of members that is secondary shows some slow queries in  logs file. When I executed sh.disableAutoSplit(), there was more slow queries on this secondary&apos;s log. And  the ops of all members have risen to 2k/s.&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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4490] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;autosplit&quot; }, readConcern: { level: &quot;majority&quot;,&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;   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; afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur&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;   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;ned:1 reslen:391 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4997ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4585] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;balancer&quot; }, readConcern: { level: &quot;majority&quot;, &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;   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;afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn&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;   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;ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4997ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4602] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;chunksize&quot; }, readConcern: { level: &quot;majority&quot;,&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;   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; afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur&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;   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;ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4989ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4583] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;balancer&quot; }, readConcern: { level: &quot;majority&quot;, &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;   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;afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn&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;   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;ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4989ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4580] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;chunksize&quot; }, readConcern: { level: &quot;majority&quot;,&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;   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; afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur&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;   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;ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4994ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4545] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;autosplit&quot; }, readConcern: { level: &quot;majority&quot;,&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;   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; afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur&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;   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;ned:1 reslen:391 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4997ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4600] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;balancer&quot; }, readConcern: { level: &quot;majority&quot;, &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;   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;afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn&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;   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;ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4963ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4451] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;balancer&quot; }, readConcern: { level: &quot;majority&quot;, &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;   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;afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn&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;   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;ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4988ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4572] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;chunksize&quot; }, readConcern: { level: &quot;majority&quot;,&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;   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; afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur&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;   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;ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4976ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4387] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;balancer&quot; }, readConcern: { level: &quot;majority&quot;, &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;   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;afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturn&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;   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;ed:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4908ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4578] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;chunksize&quot; }, readConcern: { level: &quot;majority&quot;,&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;   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; afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur&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;   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;ned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4974ms&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;   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;2017-12-19T20:14:12.749+0800 I COMMAND  [conn4607] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;autosplit&quot; }, readConcern: { level: &quot;majority&quot;,&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;   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; afterOpTime: { ts: Timestamp 1513685647000|1, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nretur&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;ned:1 reslen:391 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4990ms&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="474621">SERVER-32418</key>
            <summary>Due to a lag, query is very slow in the config server</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="13202">Works as Designed</resolution>
                                        <assignee username="dmitry.agranat@mongodb.com">Dmitry Agranat</assignee>
                                    <reporter username="ufozhangliang@163.com">liangzhang</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Dec 2017 08:39:12 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:03 +0000</updated>
                            <resolved>Mon, 5 Mar 2018 14:42:39 +0000</resolved>
                                    <version>3.4.10</version>
                                                    <component>Performance</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1822465" author="dmitry.agranat" created="Sun, 4 Mar 2018 11:59:21 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for providing the requested information.&lt;/p&gt;

&lt;p&gt;As suspected, when there is a lag, the reported query is slow in the config server. This is expected as explained in my previous comment. Looking at the two such occurrences:&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/180837/180837_lag.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The times presented above are in UTC&lt;/li&gt;
	&lt;li&gt;A and B represent the start of the slow query which correlates with the lag:
&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;2018-03-02T15:38:23.554+0800 I COMMAND  [conn405762] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;balancer&quot; }, readConcern: { level: &quot;majority&quot;, afterOpTime: { ts: Timestamp 1519976298000|5, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturned:1 reslen:404 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4998ms&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;2018-03-02T15:45:23.509+0800 I COMMAND  [conn405848] command config.settings command: find { find: &quot;settings&quot;, filter: { _id: &quot;chunksize&quot; }, readConcern: { level: &quot;majority&quot;, afterOpTime: { ts: Timestamp 1519976718000|4, t: 9 } }, limit: 1, maxTimeMS: 30000 } planSummary: IDHACK keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturned:1 reslen:392 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_command 4998ms&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;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I am going to close this ticket as &quot;works as designed&quot;. However, I&apos;d like to mention one abnormality I&apos;ve noticed:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Server &lt;tt&gt;BJ-DB-107&lt;/tt&gt; is &lt;b&gt;3.2.13&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;Server &lt;tt&gt;ZW-10-0-1-76&lt;/tt&gt; is 3.4.10&lt;/li&gt;
	&lt;li&gt;Server &lt;tt&gt;BJ-DB-109&lt;/tt&gt; is 3.4.10&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The practice of mixing different major MongoDB versions in a replica set is not recommended (except for the time of the upgrade). Perhaps, by fixing this misconfiguration, you might fix the issue with the periodic lag in your config servers replica set.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;


</comment>
                            <comment id="1820886" author="ufozhangliang@163.com" created="Fri, 2 Mar 2018 09:46:31 +0000"  >&lt;p&gt;files have been uploaded .&lt;/p&gt;</comment>
                            <comment id="1818427" author="dmitry.agranat" created="Wed, 28 Feb 2018 13:53:17 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for providing the requested information.&lt;/p&gt;

&lt;p&gt;I&apos;d like to validate that there is no replication lag between your config servers. Please note that the read is doing &lt;tt&gt;afterOptime&lt;/tt&gt; in combination with &lt;tt&gt;readConcern: majority&lt;/tt&gt; so the query will block, holding no locks, until a majority of members have reached the specified optime.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Please archive (tar or zip) the $dbpath/diagnostic.data directory from &lt;b&gt;all the config servers&lt;/b&gt; covering the time when the query is very slow on the config server and upload it to this ticket.&lt;/li&gt;
	&lt;li&gt;A fresh set of config server logs where the query is very slow.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                            <comment id="1813972" author="ufozhangliang@163.com" created="Fri, 23 Feb 2018 09:56:27 +0000"  >&lt;p&gt;Sorry, the reply is delayed. Uploaded log of all nodes.All nodes have this problem.&lt;/p&gt;</comment>
                            <comment id="1808620" author="thomas.schubert" created="Fri, 16 Feb 2018 22:39:41 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We still need additional information to diagnose the problem. If this is still an issue for you, would you please address the questions in Mark&apos;s most recent comment?&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1782826" author="mark.agarunov" created="Tue, 23 Jan 2018 21:54:25 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the additional information and my apologies for the delay in replying. Unfortunately we have not yet been able to determine the cause of this behavior. If possible, could you provide the complete logs from all nodes in the cluster? Additionally, is this behavior causing adverse issues such as performance regressions? Do all the nodes experience the same issue or only this specific node?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1759922" author="ufozhangliang@163.com" created="Wed, 27 Dec 2017 09:20:51 +0000"  >&lt;p&gt;if re-enable autosplit, this slow query will also have less than disabled, but there will also be.&lt;br/&gt;
when re-enabled autosplit, ops will be reduced a lot,but  there show  less slow query  in logs.&lt;/p&gt;</comment>
                            <comment id="1759668" author="mark.agarunov" created="Tue, 26 Dec 2017 19:35:38 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for providing this information. After looking over the logs and diagnostic data, it seems that the slow queries are correlated with saslStart and saslContinue commands:&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/174305/174305_ftdc.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;This leads me to suspect that the slow queries may be due to a slow response from the sasl authentication. Was this behavior present in any capacity before disabling autosplitting, and does it continue if autosplit is re enabled?&lt;/p&gt;

&lt;p&gt;Thanks&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1758038" author="mark.agarunov" created="Thu, 21 Dec 2017 18:32:29 +0000"  >&lt;p&gt;Hello  &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. To get a better idea of what may be causing this behavior, could you please provide the following:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The complete log files from all affected node&lt;/li&gt;
	&lt;li&gt;Please archive (tar or zip) the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; directory and upload it to this ticket.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This should give some insight into this issue.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1756668" author="ufozhangliang@163.com" created="Wed, 20 Dec 2017 11:57:18 +0000"  >&lt;p&gt;config server queries take about 2s, and sometimes it would block our client query.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="180716" name="config.log.rar" size="119317106" author="ufozhangliang@163.com" created="Fri, 2 Mar 2018 08:46:31 +0000"/>
                            <attachment id="174212" name="config.log.tgz" size="107957" author="ufozhangliang@163.com" created="Fri, 22 Dec 2017 04:00:07 +0000"/>
                            <attachment id="174213" name="diagnostic.data.tgz" size="17133436" author="ufozhangliang@163.com" created="Fri, 22 Dec 2017 04:05:14 +0000"/>
                            <attachment id="174305" name="ftdc.png" size="54484" author="mark.agarunov" created="Tue, 26 Dec 2017 19:35:28 +0000"/>
                            <attachment id="180837" name="lag.png" size="135621" author="dmitry.agranat@mongodb.com" created="Mon, 5 Mar 2018 08:09:41 +0000"/>
                            <attachment id="180087" name="log-20180223-16.rar" size="77291" author="ufozhangliang@163.com" created="Fri, 23 Feb 2018 09:56:12 +0000"/>
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