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    <title>MongoDB Jira</title>
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    <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-44821] retrieving storage stats for currentOp blocked by slow oplog application</title>
                <link>https://jira.mongodb.org/browse/SERVER-44821</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On a secondary node, the currentOp command includes &lt;a href=&quot;https://github.com/mongodb/mongo/blob/91fc73a60e523e40defcaa8b6cd808a3091aec34/src/mongo/db/commands/dbcommands_d.cpp#L126&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;storage stats&lt;/a&gt; in its slow op log. If oplog application is taking too long to apply a batch of operations, this may prevent the currentOp from completing in a timely manner.&lt;/p&gt;

&lt;p&gt;=========&lt;/p&gt;

&lt;p&gt;The defect addressed here primarily involves the Parallel Batch Writer Mutex (PBWM), a logical resource that is required for oplog application on a secondary node. Prior to this fix, it was possible for the &lt;a href=&quot;https://www.mongodb.com/docs/v4.4/reference/command/profile/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;database profiler&lt;/a&gt; and the &lt;a href=&quot;https://www.mongodb.com/docs/v4.4/reference/command/currentOp/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;currentOp&lt;/a&gt; command to compete for the PBWM resource with secondary oplog application.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1024179">SERVER-44821</key>
            <summary>retrieving storage stats for currentOp blocked by slow oplog application</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="13201">Fixed</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Nov 2019 15:56:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:37 +0000</updated>
                            <resolved>Wed, 8 Jan 2020 14:58:58 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.14</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3713663" author="xgen-internal-githook" created="Mon, 12 Apr 2021 17:53:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44821&quot; title=&quot;retrieving storage stats for currentOp blocked by slow oplog application&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44821&quot;&gt;&lt;del&gt;SERVER-44821&lt;/del&gt;&lt;/a&gt; accessing db.system.profile and currentOp storage stats should not conflict with slow oplog application&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 87bcfd4931e002bcfdb563d58bde06e32aca1d8d)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46d92ea10a90b8d1330f9e42e90783419598abd8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46d92ea10a90b8d1330f9e42e90783419598abd8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2711857" author="xgen-internal-githook" created="Wed, 8 Jan 2020 14:24:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44821&quot; title=&quot;retrieving storage stats for currentOp blocked by slow oplog application&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44821&quot;&gt;&lt;del&gt;SERVER-44821&lt;/del&gt;&lt;/a&gt; logging slow ops should not conflict with two phase index commits&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d401d80a2c89d89db26750956cb3b3261e595a34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d401d80a2c89d89db26750956cb3b3261e595a34&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2711793" author="xgen-internal-githook" created="Wed, 8 Jan 2020 14:06:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44821&quot; title=&quot;retrieving storage stats for currentOp blocked by slow oplog application&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44821&quot;&gt;&lt;del&gt;SERVER-44821&lt;/del&gt;&lt;/a&gt; accessing db.system.profile and currentOp storage stats should not conflict with slow oplog application&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/87bcfd4931e002bcfdb563d58bde06e32aca1d8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/87bcfd4931e002bcfdb563d58bde06e32aca1d8d&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1024185">SERVER-44822</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1026730">SERVER-44859</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1040795">SERVER-45007</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="678694">SERVER-39218</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2332290">SERVER-76851</issuekey>
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