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    <link>https://jira.mongodb.org</link>
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    <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-27446] operation_latency_histogram.js fails in initial sync passthrough due to reads performed by the repl system</title>
                <link>https://jira.mongodb.org/browse/SERVER-27446</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.1/jstests/core/operation_latency_histogram.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;operation_latency_histogram.js&lt;/a&gt; integration test makes assertions about the number of read and write operations performed against a particular collection in order to test the new &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.1/jstests/core/operation_latency_histogram.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;latencyStats()&lt;/a&gt; feature available in version 3.4. In particular, it writes to a collection and ensures the latency stats reflect the correct count of write operations, but that the number of read operations has not changed (aside from the read done to retrieve the latency stats themselves).&lt;/p&gt;

&lt;p&gt;The assumption that the number of read operations has not changed, however, is invalid in our initial sync passthrough suite, &lt;tt&gt;core_small_oplog_rs_initsync&lt;/tt&gt;. When an initial sync occurs during the execution of the test, the downstream node will issue a &lt;tt&gt;find&lt;/tt&gt; command against its sync source in order to clone the data. From the sync source&apos;s perspective, this read looks just like any user-issued &lt;tt&gt;find&lt;/tt&gt;, and it will be counted by the operation latency histogram. This causes the read count to be higher than expected by the test.&lt;/p&gt;</description>
                <environment></environment>
        <key id="339443">SERVER-27446</key>
            <summary>operation_latency_histogram.js fails in initial sync passthrough due to reads performed by the repl system</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Dec 2016 16:13:48 +0000</created>
                <updated>Wed, 5 Apr 2017 11:43:15 +0000</updated>
                            <resolved>Fri, 16 Dec 2016 20:18:48 +0000</resolved>
                                                    <fixVersion>3.4.2</fixVersion>
                    <fixVersion>3.5.2</fixVersion>
                                    <component>Querying</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1463272" author="xgen-internal-githook" created="Wed, 21 Dec 2016 18:01:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27446&quot; title=&quot;operation_latency_histogram.js fails in initial sync passthrough due to reads performed by the repl system&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27446&quot;&gt;&lt;del&gt;SERVER-27446&lt;/del&gt;&lt;/a&gt; blacklist operation_latency_histogram.js from background initial sync passthroughs&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 530418b23c4c9d45cde993853967fe1b7b636c47)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9c5e101e43a6aae2d3ee56206492c1df0b960cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9c5e101e43a6aae2d3ee56206492c1df0b960cf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1460189" author="xgen-internal-githook" created="Fri, 16 Dec 2016 20:17:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27446&quot; title=&quot;operation_latency_histogram.js fails in initial sync passthrough due to reads performed by the repl system&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27446&quot;&gt;&lt;del&gt;SERVER-27446&lt;/del&gt;&lt;/a&gt; blacklist operation_latency_histogram.js from background initial sync passthroughs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/530418b23c4c9d45cde993853967fe1b7b636c47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/530418b23c4c9d45cde993853967fe1b7b636c47&lt;/a&gt;&lt;/p&gt;</comment>
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