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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-26815] ShardRemote::getConnString() is very expensive</title>
                <link>https://jira.mongodb.org/browse/SERVER-26815</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ShardRemote::getConnString() involves locking a mutex at ReplicaSetMonitor::getServerAddress and a building a string from scratch into a StringBuffer in SetState::getConfirmedServerAddress()&lt;br/&gt;
this should be cached to provide better performance and less lock contention.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="327442">SERVER-26815</key>
            <summary>ShardRemote::getConnString() is very expensive</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 27 Oct 2016 20:50:54 +0000</created>
                <updated>Mon, 29 Jan 2018 18:35:19 +0000</updated>
                            <resolved>Wed, 6 Sep 2017 20:34:50 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1440735" author="misha.tyulenev" created="Tue, 22 Nov 2016 23:37:13 +0000"  >&lt;p&gt;Per  discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt; according to the stack the call to getConnString() happens only on new connection establishment when the connection pool is being populated. &lt;/p&gt;</comment>
                            <comment id="1440572" author="misha.tyulenev" created="Tue, 22 Nov 2016 21:41:37 +0000"  >&lt;p&gt;In my experiment it was a mongo shell connected to a db. every find command was getting into this.&lt;/p&gt;</comment>
                            <comment id="1440455" author="kaloian.manassiev" created="Tue, 22 Nov 2016 19:55:45 +0000"  >&lt;p&gt;This only happens on new connection establishment, right?&lt;/p&gt;</comment>
                            <comment id="1440447" author="misha.tyulenev" created="Tue, 22 Nov 2016 19:48:22 +0000"  >&lt;p&gt;Done an investigation if getConnString() is on any CRUD path&lt;/p&gt;

&lt;p&gt;collection.insert()&lt;br/&gt;
collection.update()&lt;br/&gt;
collection.remove()&lt;br/&gt;
do not call get getConnString()&lt;/p&gt;

&lt;p&gt;however&lt;br/&gt;
collection.find() does call getConnString() as a part of the following stack trace&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;
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					&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;#0  mongo::ShardRemote::getConnString (this=0x7f639d1deec0) at src/mongo/s/client/shard_remote.cpp:119&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#1  0x00007f63a0c0ee2d in mongo::ShardingNetworkConnectionHook::makeRequest (this=0x7f639d39db60, remoteHost=...)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    at src/mongo/s/client/sharding_network_connection_hook.cpp:106&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#2  0x00007f63a0b0fb0e in mongo::executor::callNoexcept&amp;lt;mongo::executor::NetworkConnectionHook, mongo::StatusWith&amp;lt;boost::optional&amp;lt;mongo::executor::RemoteCommandRequest&amp;gt; &amp;gt;, mongo::HostAndPort const&amp;amp;, mongo::HostAndPort const&amp;amp;&amp;gt; (obj=..., &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    method=&amp;amp;virtual mongo::executor::NetworkConnectionHook::makeRequest(mongo::HostAndPort const&amp;amp;)) at src/mongo/executor/network_interface_asio.h:510&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#3  0x00007f63a0b0c0b6 in mongo::executor::NetworkInterfaceASIO::_runConnectionHook (this=0x7f639d3b2b20, op=0x7f639cd134a0)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    at src/mongo/executor/network_interface_asio_command.cpp:437&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#4  0x00007f63a0b06852 in mongo::executor::NetworkInterfaceASIO::_authenticate (this=0x7f639d3b2b20, op=0x7f639cd134a0)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    at src/mongo/executor/network_interface_asio_auth.cpp:179&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#5  0x00007f63a0b0592b in mongo::executor::NetworkInterfaceASIO::&amp;lt;lambda()&amp;gt;::operator()(void) const (__closure=0x7f639f3a4cb0)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    at src/mongo/executor/network_interface_asio_auth.cpp:162&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#6  0x00007f63a0b06d3f in mongo::executor::NetworkInterfaceASIO::_validateAndRun&amp;lt;const mongo::executor::NetworkInterfaceASIO::_runIsMaster(mongo::executor::NetworkInterfaceASIO::AsyncOp*)::&amp;lt;lambda()&amp;gt; &amp;gt;(mongo::executor::NetworkInterfaceASIO::AsyncOp *, std::error_code, &amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x421fe21, DIE 0x425cdb1&amp;gt;) (this=0x7f639d3b2b20, op=0x7f639cd134a0, ec=..., &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    handler=&amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x421fe21, DIE 0x425cdb1&amp;gt;) at src/mongo/executor/network_interface_asio.h:435&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#7  0x00007f63a0b05c75 in mongo::executor::NetworkInterfaceASIO::&amp;lt;lambda(std::error_code, size_t)&amp;gt;::operator()(std::error_code, size_t) const (&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    __closure=0x7f639f3a4ca0, ec=..., bytes=189) at src/mongo/executor/network_interface_asio_auth.cpp:167&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#8  0x00007f63a0b0758a in std::_Function_handler&amp;lt;void(std::error_code, long unsigned int), mongo::executor::NetworkInterfaceASIO::_runIsMaster(mongo::executor::NetworkInterfaceASIO::AsyncOp*)::&amp;lt;lambda(std::error_code, size_t)&amp;gt; &amp;gt;::_M_invoke(const std::_Any_data &amp;amp;, &amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x421fe21, DIE 0x425e334&amp;gt;, &amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x421fe21, DIE 0x425e339&amp;gt;) (__functor=..., &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    __args#0=&amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x421fe21, DIE 0x425e334&amp;gt;, &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    __args#1=&amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x421fe21, DIE 0x425e339&amp;gt;) at /opt/mongodbtoolchain/v2/include/c++/5.3.0/functional:1871&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#9  0x00007f63a0abeca3 in std::function&amp;lt;void (std::error_code, unsigned long)&amp;gt;::operator()(std::error_code, unsigned long) const (this=0x7f63893780b0, &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    __args#0=..., __args#1=189) at /opt/mongodbtoolchain/v2/include/c++/5.3.0/functional:2271&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#10 0x00007f63a0b0af88 in mongo::executor::NetworkInterfaceASIO::&amp;lt;lambda(std::error_code, size_t)&amp;gt;::operator()(std::error_code, size_t) const (&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    __closure=0x7f63893780a0, ec=..., bytes=189) at src/mongo/executor/network_interface_asio_command.cpp:390&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#11 0x00007f63a0b0e822 in std::_Function_handler&amp;lt;void(std::error_code, long unsigned int), mongo::executor::NetworkInterfaceASIO::_asyncRunCommand(mongo::executor::NetworkInterfaceASIO::AsyncOp*, mongo::executor::NetworkInterfaceASIO::NetworkOpHandler)::&amp;lt;lambda(std::error_code, size_t)&amp;gt; &amp;gt;::_M_invoke(const std::_Any_data &amp;amp;, &amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x4260d54, DIE 0x42aa0ca&amp;gt;, &amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x4260d54, DIE 0x42aa0cf&amp;gt;) (__functor=..., __args#0=&amp;lt;unknown type in /home/misha/work/mongo_2/mongos, CU 0x4260d54, DIE 0x42aa0ca&amp;gt;, &lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1420611" author="kaloian.manassiev" created="Fri, 28 Oct 2016 15:58:45 +0000"  >&lt;p&gt;&lt;tt&gt;Chunk::split&lt;/tt&gt; is a fairly rare operation - to the extent that caching is not necessary. Can you please update the ticket description with the operations which are impacted?&lt;/p&gt;</comment>
                            <comment id="1420576" author="misha.tyulenev" created="Fri, 28 Oct 2016 15:30:34 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt; Its being called a lot - e.g its a part of Chhunk::split. Not sure if its a part of any CRUD. Its new, in 3.2 Shard just returned the cached CS.&lt;/p&gt;</comment>
                            <comment id="1420528" author="kaloian.manassiev" created="Fri, 28 Oct 2016 14:54:16 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; - what is the external impact of this? Is it being called on critical code paths and does impact CRUD operations or just maintenance calls and new connection establishment? Also - is it new in 3.4?&lt;/p&gt;</comment>
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