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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-55606] Majority writes with j: false perform worse than j: true</title>
                <link>https://jira.mongodb.org/browse/SERVER-55606</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Parallel insert performance test shows that writes with { w: majority, j: false } perform worse than { w: majority } which enabled journaling by default.&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;        {&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;          &quot;end&quot;: 1606114697.135247,&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;          &quot;name&quot;: &quot;ParallelInsert-1-Insert_WMajority_JFalse&quot;,&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;          &quot;results&quot;: {&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;            &quot;1&quot;: {&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;              &quot;ops_per_sec&quot;: 315.3323923270361,&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;              &quot;ops_per_sec_values&quot;: [&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;                315.3323923270361&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;              ]&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;            }&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;          },&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;          &quot;start&quot;: 1606112991.5566537,&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;          &quot;workload&quot;: &quot;genny&quot;&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;        },&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;...&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;        {&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;          &quot;end&quot;: 1606114697.135247,&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;          &quot;name&quot;: &quot;ParallelInsert-1-Insert_WMajority&quot;,&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;          &quot;results&quot;: {&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;            &quot;1&quot;: {&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;              &quot;ops_per_sec&quot;: 373.07617520622085,&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;              &quot;ops_per_sec_values&quot;: [&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;                373.07617520622085&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;              ]&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;            }&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;          },&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;          &quot;start&quot;: 1606112991.5566537,&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;          &quot;workload&quot;: &quot;genny&quot;&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;        },&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;I found this issue using an update workload in my paper experiments against 4.4.2 in a 5-node setting. It&apos;s weird that the latency is about 100ms for some operations even when there&apos;s just one client. This seems related to the default&#160; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f05a11cfa32ff12c1110aa3657ec80a80de05dc3/src/mongo/db/mongod_options_storage.idl#L95-L102&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;storage.journal.commitIntervalMs&lt;/a&gt; used by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f05a11cfa32ff12c1110aa3657ec80a80de05dc3/src/mongo/db/storage/control/journal_flusher.cpp#L130&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the journal flusher&lt;/a&gt;&lt;/p&gt;

&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&#160;&lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;throughput&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;latency_50_in_ms&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;latency_90_in_ms&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;latency_99_in_ms&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;thread_num&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;iteration&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;33.166667&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;60.167260&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;99.918017&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;100.078770&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;266.000000&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;60.109203&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;99.889717&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;100.047515&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;16&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;3&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1010.766667&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;63.347630&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;101.193805&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;102.650609&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;64&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;3390.566667&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;75.609942&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;106.122061&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;110.796925&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;256&lt;/td&gt;
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&lt;/div&gt;


&lt;p&gt;After I changed &lt;tt&gt;writeConcernMajorityJournalDefault&lt;/tt&gt; to false, { w: majority } starts to perform as expected.&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
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&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&amp;nbsp;&lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; throughput &lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt; latency_90_in_ms &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; latency_99_in_ms &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; thread_num &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; iteration &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 1231.566667 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 1.586717 &lt;/td&gt;
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&lt;tr&gt;
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&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;As a comparison, the default setting with { writeConcernMajorityJournalDefault: true } and { w: majority } gives a lower but comparable throughput as expected.&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&#160;&lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;throughput&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;latency_90_in_ms&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;latency_99_in_ms&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;thread_num&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;iteration&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;0&lt;/td&gt;
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&lt;p&gt;My theory is that the code missed signaling writers when updating the positions because it is conditional on writeConcernMajorityJournalDefault.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1662690">SERVER-55606</key>
            <summary>Majority writes with j: false perform worse than j: true</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>pmr</label>
                    </labels>
                <created>Mon, 29 Mar 2021 22:55:12 +0000</created>
                <updated>Tue, 30 Jan 2024 23:38:43 +0000</updated>
                                            <version>4.2.0</version>
                    <version>4.4.2</version>
                                                                        <votes>1</votes>
                                    <watches>37</watches>
                                                                                                                <comments>
                            <comment id="4205313" author="judah.schvimer" created="Mon, 22 Nov 2021 17:00:56 +0000"  >&lt;p&gt;I wonder if this is related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59776&quot; title=&quot;50% regression in single multi-update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59776&quot;&gt;&lt;del&gt;SERVER-59776&lt;/del&gt;&lt;/a&gt; or &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54939&quot; title=&quot;Investigate secondary batching behavior in v4.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54939&quot;&gt;&lt;del&gt;SERVER-54939&lt;/del&gt;&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="3749687" author="JIRAUSER1256207" created="Fri, 30 Apr 2021 19:53:16 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alan.zheng&quot; class=&quot;user-hover&quot; rel=&quot;alan.zheng&quot;&gt;alan.zheng&lt;/a&gt; Please take a look.&lt;/p&gt;</comment>
                            <comment id="3697753" author="siyuan.zhou@10gen.com" created="Thu, 1 Apr 2021 23:48:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;&#160; Good catch! Updated the table. My understanding is &quot;the intention for&#160;&lt;tt&gt;writeConcernMajorityJournalDefault&lt;/tt&gt;&#160;is to choose the&#160;&lt;tt&gt;j&lt;/tt&gt;&#160;value for `&lt;tt&gt;w: &quot;majority&lt;/tt&gt;` writes that lack one&quot;. In the documentation, the row of &quot;j is unspecified&quot; mentions it depends on &lt;tt&gt;writeConcernMajorityJournalDefault&lt;/tt&gt; and seems sufficient to me, but that&apos;s totally a valid question for the documentation team.&lt;/p&gt;</comment>
                            <comment id="3691329" author="daniel.gottlieb@10gen.com" created="Tue, 30 Mar 2021 14:56:57 +0000"  >&lt;p&gt;Hey &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, this is real interesting. I think there&apos;s a typo in the description. The second and third tables have the same contents.&lt;/p&gt;

&lt;p&gt;Also for my benefit can you fill me in on the requirements a majority write must satisfy before returning to the client? Our documentation explicitly notes that with &lt;tt&gt;writeConcernMajorityJournalDefault&lt;/tt&gt; set to false, acknowledged writes can be rolled back:&lt;br/&gt;
 &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/307244/307244_wcDefault.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;But I don&apos;t see a corollary note regarding an explicit &lt;tt&gt;`{w: &quot;majority&quot;, j: false}`&lt;/tt&gt;:&lt;br/&gt;
 &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/307245/307245_commandInputs.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;If the intention for &lt;tt&gt;writeConcernMajorityJournalDefault&lt;/tt&gt; is to choose the &lt;tt&gt;j&lt;/tt&gt; value for `&lt;tt&gt;w: &quot;majority&lt;/tt&gt;` writes that lack one, should we be documenting that a little more clearly as well?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1997468">SERVER-64341</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1867214">SERVER-59776</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1638751">SERVER-54939</issuekey>
        </issuelink>
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                            <attachment id="307245" name="commandInputs.png" size="61364" author="daniel.gottlieb@mongodb.com" created="Tue, 30 Mar 2021 14:54:46 +0000"/>
                            <attachment id="307244" name="wcDefault.png" size="31465" author="daniel.gottlieb@mongodb.com" created="Tue, 30 Mar 2021 14:54:39 +0000"/>
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