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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-9320] Several connections request to split a same chunk at the same time.</title>
                <link>https://jira.mongodb.org/browse/SERVER-9320</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;br/&gt;
By looking into the log, I found that several connections will request to split a same chunk a the same time, which may affect the performance.&lt;/p&gt;

&lt;p&gt;log:&lt;/p&gt;
&lt;p/&gt;
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&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;Tue Apr  9 09:48:45 [conn57348] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } --&amp;gt;&amp;gt; { : 403798381 }&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;Tue Apr  9 09:48:45 [conn57347] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } --&amp;gt;&amp;gt; { : 403798381 }&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;Tue Apr  9 09:48:45 [conn57646] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } --&amp;gt;&amp;gt; { : 403798381 }&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;Tue Apr  9 09:48:45 [conn57648] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } --&amp;gt;&amp;gt; { : 403798381 }&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;Tue Apr  9 09:48:45 [conn57647] request split points lookup for chunk tw2_log_10191.gm_quest { : 387362153 } --&amp;gt;&amp;gt; { : 403798381 }&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;Tue Apr  9 09:48:46 [conn57348] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61189 took 1246ms&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;Tue Apr  9 09:48:46 [conn57348] command admin.$cmd command: { splitVector: &quot;tw2_log_10191.gm_quest&quot;, keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 301 locks(micros) r:2263610 reslen:70 1247ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57647] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61191 took 1085ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57647] command admin.$cmd command: { splitVector: &quot;tw2_log_10191.gm_quest&quot;, keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 32 locks(micros) r:2150012 reslen:70 1085ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57646] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61193 took 1109ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57646] command admin.$cmd command: { splitVector: &quot;tw2_log_10191.gm_quest&quot;, keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 33 locks(micros) r:2188370 reslen:70 1109ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57648] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61196 took 1118ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57648] command admin.$cmd command: { splitVector: &quot;tw2_log_10191.gm_quest&quot;, keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 22 locks(micros) r:2220804 reslen:70 1118ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57347] warning: Finding the split vector for tw2_log_10191.gm_quest over { _sk: 1 } keyCount: 203360 numSplits: 1 lookedAt: 61202 took 1138ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Apr  9 09:48:46 [conn57347] command admin.$cmd command: { splitVector: &quot;tw2_log_10191.gm_quest&quot;, keyPattern: { _sk: 1 }, min: { _sk: 387362153 }, max: { _sk: 403798381 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 2, maxChunkObjects: 250000, $auth: { local: { __system: 2 } } } ntoreturn:1 keyUpdates:0 numYields: 102 locks(micros) r:2260997 reslen:70 1138ms&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>Linux 2.6.38-2-amd64&lt;br/&gt;
90 mongos linked to one cluster with 4 shards.</environment>
        <key id="71443">SERVER-9320</key>
            <summary>Several connections request to split a same chunk at the same time.</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="-1">Unassigned</assignee>
                                    <reporter username="strlee">stronglee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Apr 2013 07:28:22 +0000</created>
                <updated>Fri, 12 Apr 2013 17:05:28 +0000</updated>
                            <resolved>Fri, 12 Apr 2013 17:05:28 +0000</resolved>
                                    <version>2.2.3</version>
                                                    <component>Performance</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="311106" author="strlee" created="Thu, 11 Apr 2013 13:39:55 +0000"  >&lt;p&gt;Hi Scott Hernandez,&lt;/p&gt;

&lt;p&gt;Thank you for your introductions.&lt;/p&gt;</comment>
                            <comment id="311072" author="scotthernandez" created="Thu, 11 Apr 2013 12:52:01 +0000"  >&lt;p&gt;This is normal since every mongos may request a split point independently. These message are more a symptom of other activity on the system causing it to be slow, not because of the split requests themselves. Note how many yields the splitsVectors had to do to complete... this is an indication of a highly active (and probably over capacity) system.&lt;/p&gt;</comment>
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            <issuekey id="71153">SERVER-9287</issuekey>
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