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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>
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<item>
            <title>[DOCS-13207] Mongod Journaling docs are incomplete and/or incorrect</title>
                <link>https://jira.mongodb.org/browse/DOCS-13207</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

&lt;p&gt;Journaling docs at&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/core/journaling/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/journaling/&lt;/a&gt;&#160;says &quot;&lt;b&gt;MongoDB syncs the buffered journal data to disk every 50 milliseconds (Starting in MongoDB 3.2)&lt;/b&gt;&quot;&lt;/p&gt;

&lt;p&gt;However this is incorrect (or at least not completely the answer) and is potentially causing users to think MongoDB can&apos;t provide a highly available data solution (ie. write concern majority) and also yield response times in far less than 50 milliseconds at the same time.&#160;&lt;/p&gt;

&lt;p&gt;However, for example: I am seeing in my own tests, with write concern = majority for an Atlas hosted replica-set across 3 availability zones in one region, an average response time of around 5ms and maximum response time of around 10ms.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;I&apos;ve just been informed that actually for write concern majority at least, the journal behaviour is:&lt;/b&gt;&#160;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;write is journaled and flushed to disk immediately on the primary - no waiting for next journal batch write - mongod does this on a separate thread so that multiple writes can be part of the same flush its not one flush per write&lt;/li&gt;
	&lt;li&gt;once journaled to disk on primary disk then the change is available to be replicated&lt;/li&gt;
	&lt;li&gt;each secondary listening to the primary&apos;s oplog does the same and flushes journal to disk as soon as it received the change before then acknowledging back&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Therefore the latency of a client performing a write to a 3 node replica set using a write concern of majority is:&#160;2Xjournal-flush + 1X network roundtrip, which will be in the order of 5-10 milliseconds for SSD disks and a fairly local network of 3 replicas.&#160;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;</description>
                <environment></environment>
        <key id="992515">DOCS-13207</key>
            <summary>Mongod Journaling docs are incomplete and/or incorrect</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="paul.done@mongodb.com">Paul Done</reporter>
                        <labels>
                            <label>docs-administration</label>
                            <label>docs-query</label>
                    </labels>
                <created>Thu, 7 Nov 2019 15:47:22 +0000</created>
                <updated>Mon, 30 Oct 2023 19:33:09 +0000</updated>
                            <resolved>Tue, 12 Nov 2019 19:44:02 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2537335" author="xgen-internal-githook" created="Tue, 12 Nov 2019 19:43:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13207&quot; title=&quot;Mongod Journaling docs are incomplete and/or incorrect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13207&quot;&gt;&lt;del&gt;DOCS-13207&lt;/del&gt;&lt;/a&gt;: clarify journaling frequency (secondary)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f6f579e0f7fc7fa0998e738c4f9d4c3f945c8eeb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f6f579e0f7fc7fa0998e738c4f9d4c3f945c8eeb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2537332" author="xgen-internal-githook" created="Tue, 12 Nov 2019 19:42:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13207&quot; title=&quot;Mongod Journaling docs are incomplete and/or incorrect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13207&quot;&gt;&lt;del&gt;DOCS-13207&lt;/del&gt;&lt;/a&gt;: clarify journaling frequency (secondary)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/7b3f3af433fed06f1de7f2c8e546c135ba85bf41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/7b3f3af433fed06f1de7f2c8e546c135ba85bf41&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2537214" author="xgen-internal-githook" created="Tue, 12 Nov 2019 19:17:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13207&quot; title=&quot;Mongod Journaling docs are incomplete and/or incorrect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13207&quot;&gt;&lt;del&gt;DOCS-13207&lt;/del&gt;&lt;/a&gt;: clarify journaling frequency (secondary)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/bb86dbe5e5b1dbade1108dc288a3ddaa94bc9905&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/bb86dbe5e5b1dbade1108dc288a3ddaa94bc9905&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2536859" author="xgen-internal-githook" created="Tue, 12 Nov 2019 16:38:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13207&quot; title=&quot;Mongod Journaling docs are incomplete and/or incorrect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13207&quot;&gt;&lt;del&gt;DOCS-13207&lt;/del&gt;&lt;/a&gt;: clarify journaling frequency&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c609c2cddd1bd221c3b0560ba5895a90a69c1c25&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c609c2cddd1bd221c3b0560ba5895a90a69c1c25&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2536850" author="xgen-internal-githook" created="Tue, 12 Nov 2019 16:36:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13207&quot; title=&quot;Mongod Journaling docs are incomplete and/or incorrect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13207&quot;&gt;&lt;del&gt;DOCS-13207&lt;/del&gt;&lt;/a&gt;: clarify journaling frequency&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8fece02cd4b75d532a4f9385f3c4a9654d5c3d9a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8fece02cd4b75d532a4f9385f3c4a9654d5c3d9a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2536775" author="xgen-internal-githook" created="Tue, 12 Nov 2019 16:18:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13207&quot; title=&quot;Mongod Journaling docs are incomplete and/or incorrect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13207&quot;&gt;&lt;del&gt;DOCS-13207&lt;/del&gt;&lt;/a&gt;: clarify journaling frequency&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a08ebfe5b32f636b0ba60fb7a261c4c5d8b9b3c7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a08ebfe5b32f636b0ba60fb7a261c4c5d8b9b3c7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2522511" author="ravind.kumar" created="Thu, 7 Nov 2019 16:06:41 +0000"  >&lt;p&gt;We may also need to clarify the following to really close up this hole:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;What is the relationship between &lt;tt&gt;journalCommitInterval&lt;/tt&gt; and &lt;tt&gt;commitIntervalMs&lt;/tt&gt; . Can you set a higher &lt;tt&gt;journalCommitiNterval&lt;/tt&gt; than &lt;tt&gt;commitIntervalMs&lt;/tt&gt; ?&lt;/li&gt;
	&lt;li&gt;Does setting &lt;tt&gt;j : true&lt;/tt&gt; result definitely result in an immediate sync to disk?&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="2522488" author="ravind.kumar" created="Thu, 7 Nov 2019 15:58:36 +0000"  >&lt;p&gt;This is related to (and probably can be absorbed into) &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;However, based on the conversation in that ticket, we only covered secondary oplog getMore&apos;s resulting in an immediate flush. Based on Paul&apos;s comments, it looks like majority write concern also causes immediate flushing?&lt;/p&gt;

&lt;p&gt;This raises a few follow-ups:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Is it strictly &lt;tt&gt;w: &quot;majority&quot;&lt;/tt&gt; ? Would setting a &lt;tt&gt;w : n&lt;/tt&gt; where &lt;tt&gt;n&lt;/tt&gt; is a majority (or more) also trigger this behavior?&lt;/li&gt;
	&lt;li&gt;Do any other read/write operations trigger an immediate flush?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=boschg%40mac.com&quot; class=&quot;user-hover&quot; rel=&quot;boschg@mac.com&quot;&gt;boschg@mac.com&lt;/a&gt;, its been a while but our last conversation on this did not cover client-triggered journal flushing, only flushing due to replica set members.&lt;/p&gt;

&lt;p&gt;Taking the findings here and in that ticket together, it seems like the behavior is:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;With no pending &lt;tt&gt;getMore&lt;/tt&gt; against the oplog, flushes occur on average every 50ms.&lt;/li&gt;
	&lt;li&gt;With any pending &lt;tt&gt;GetMore&lt;/tt&gt; against the oplog, flushes occur immediately&lt;/li&gt;
	&lt;li&gt;With any &lt;tt&gt;w: &quot;majority&quot;&lt;/tt&gt; write, flushes occur immediately&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;So something like:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Clusters on average flush every 50ms.&lt;/li&gt;
	&lt;li&gt;If writes occur more rapidly than 50ms, journal flush frequency also increases as oplog readers cause journal flushing&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;
	&lt;ul&gt;
		&lt;li&gt;There&apos;s a note in &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12096&quot; title=&quot;Primaries journal much more frequently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12096&quot;&gt;&lt;del&gt;DOCS-12096&lt;/del&gt;&lt;/a&gt; about replication lag reducing oplog flushes I could not quite parse out.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;w: majority or j:true always trigger an immediate flush&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;This is all specific to WiredTiger. It is unclear how much of this behavior applies to MMAPv1, which has a default &lt;tt&gt;30&lt;/tt&gt; ms &lt;tt&gt;commitIntervalMs&lt;/tt&gt;.&lt;/p&gt;</comment>
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