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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-21921] Insert is taking huge time in wiretiger storage engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-21921</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;br/&gt;
Inserts are taking lots of time in wiretiger storage engine.&lt;br/&gt;
We are having around 6000 collections in this database and are using mongo 3.0.6 shard cluster with only one shard and database is not sharded in this cluster. &lt;br/&gt;
Is this the default behaviour or issue with wiretiger storage engine.&lt;/p&gt;

&lt;p&gt;Queries are like this:&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;   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;2015-12-16T10:32:13.146+0000 I COMMAND  [conn48] command abc.$cmd command: insert { ins: &quot;56711241e4b0ac2aafd0114a_1450250822756&quot;, documents: [ { _id: ObjectId(&apos;56713dace4b007382af53e2e&apos;), a: &quot; XXXX&quot;, b: &quot;XXX&quot;, c: XXX, d: &quot;XXX&quot;, e: &quot;123&quot;, f: &quot;XXX@XXX.com&quot; } ], g: XX, metadata: { shardName: &quot;shard1&quot;, shardVersion: [ Timestamp 0|0, ObjectId(&apos;000000000000000000000000&apos;) ], session: 0 } } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:140 locks:{ Global: { acquireCount: { r: 2, w: 2 } }, Database: { acquireCount: { w: 2 }, acquireWaitCount: { w: 1 }, timeAcquiringMicros: { w: 1138240 } }, Collection: { acquireCount: { w: 1 } }, oplog: { acquireCount: { w: 1 } } } 638ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;Mongostat O/P:&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;# mongostat --port 27012&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;insert query update delete getmore command % dirty % used flushes vsize   res qr|qw ar|aw netIn netOut conn    set repl     time&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;  1309   659    657     *0     728   814|0     0.3   80.0       0 22.4G 16.2G   0|0   1|1    1m     2m  167 shard1  PRI 11:10:57&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;  1154   509    512     *0     727   796|0     0.3   80.0       0 22.4G 16.2G   0|0   1|0    1m     1m  167 shard1  PRI 11:10:58&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;  1377   731    730     *0     719   827|0     0.3   80.0       0 22.4G 16.2G   0|0   1|0    1m     2m  167 shard1  PRI 11:10:59&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;  1262   607    606     *0     723   810|0     0.3   80.0       0 22.4G 16.2G   0|0   1|0    1m     2m  167 shard1  PRI 11:11:00&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;server : EC2 Instance Type: m4.xlarge&lt;/p&gt;</description>
                <environment></environment>
        <key id="244140">SERVER-21921</key>
            <summary>Insert is taking huge time in wiretiger storage engine</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="4">Incomplete</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="rakesh.mib.j@gmail.com">Rakesh Kumar</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Dec 2015 11:24:27 +0000</created>
                <updated>Tue, 16 Nov 2021 17:19:24 +0000</updated>
                            <resolved>Sat, 9 Jan 2016 13:37:19 +0000</resolved>
                                    <version>3.0.6</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1116396" author="thomas.schubert" created="Wed, 16 Dec 2015 19:59:06 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rakesh.mib.j&quot; class=&quot;user-hover&quot; rel=&quot;rakesh.mib.j&quot;&gt;rakesh.mib.j&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the report. We see that the operation is waiting for a lock before actually doing the insert. E.g. &lt;tt&gt;timeAcquiringMicros: { w: 1138240&lt;/tt&gt;}&lt;/p&gt;

&lt;p&gt;To help us better understand your system and what&apos;s going on here, could you please answer the following questions about your deployment and environment:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Are you seeing inserts taking a long time on all collections?&lt;/li&gt;
	&lt;li&gt;Can you please post the output of &lt;a href=&quot;https://docs.mongodb.org/manual/reference/command/dbStats/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dbstats&lt;/a&gt;?&lt;/li&gt;
	&lt;li&gt;Can you &lt;a href=&quot;https://docs.mongodb.org/manual/tutorial/list-indexes/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;list the indexes&lt;/a&gt; on the the affected collections?&lt;/li&gt;
	&lt;li&gt;Can you provide more information about the configuration of your storage system? What kind of block devices are you using? What file systems are you using?&lt;/li&gt;
	&lt;li&gt;What other operations is your application doing when you observe this performance degredation? Are you doing other updates in addition to the inserts, or just reads?&lt;/li&gt;
	&lt;li&gt;Is your observable speed consistent or is there variation? Is it faster some times and slower others?&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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