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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-13635] Investigate changes in SERVER-47672: Add minSnapshotHistoryWindowInSeconds parameter</title>
                <link>https://jira.mongodb.org/browse/DOCS-13635</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;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Removed startup/runtime --setParameter maxTargetSnapshotHistoryWindowInSeconds=int (default: 5) Maximum target snapshot history window, in seconds&lt;br/&gt;
Removed startup/runtime --setParameter snapshotWindowMultiplicativeDecrease=double (default: 0.75) Snapshot window multiplicative decrease&lt;br/&gt;
Removed startup/runtime --setParameter snapshotWindowAdditiveIncreaseSeconds=int (default: 2) Snapshot window multiplicative increase, in seconds&lt;br/&gt;
Removed startup/runtime --setParameter minMillisBetweenSnapshotWindowInc=int (default: 500) Minimum duration between snapshot window increment, in milliseconds&lt;br/&gt;
Removed startup/runtime --setParameter minMillisBetweenSnapshotWindowDec=int (default: 500) Minimum duration between snapshot window decrement, in milliseconds&lt;br/&gt;
Removed startup/runtime --setParameter checkCachePressurePeriodSeconds=int (default: 5) Check cache pressure period, in seconds&lt;/p&gt;

&lt;p&gt;Added startup/runtime --setParameter minSnapshotHistoryWindowInSeconds=int (default: 5) Minimum target snapshot history data to keep, in seconds. Snapshot (point-in-time) reads that read data at a version older than this will get SnapshotTooOld errors.&lt;/p&gt;

&lt;p&gt;Deleted metrics in the &quot;snapshot-window-settings&quot; subsection of the wiredTiger serverStatus section that are no longer relevant.&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&quot;max target available snapshots window size in seconds&#8221;&lt;/li&gt;
	&lt;li&gt;&quot;target available snapshots window size in seconds&quot;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Add metric &quot;minimum target snapshots window size in seconds&quot; in the &quot;snapshot-window-settings&quot; subsection of the wiredTiger serverStatus section &amp;#8211; this reports the minSnapshotHistoryWindowInSeconds configuration.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Add a new startup and runtime server parameter minSnapshotHistoryWindowInSeconds for mongod, which is the amount of history in seconds stored by the system. Remove support for maxTargetSnapshotHistoryWindowInSeconds.&lt;/p&gt;

&lt;p&gt;Also remove snapshot window adjustment logic, see&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31767&quot; title=&quot;Provide a window of snapshot history that is accessible for PIT reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31767&quot;&gt;&lt;del&gt;SERVER-31767&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;This logic was used to dynamically change the amount of history stored to avoid cache pressure. Given durable history is available now, this is no longer needed.&lt;/li&gt;
	&lt;li&gt;Delete metrics in the &quot;snapshot-window-settings&quot; subsection of the wiredTiger serverStatus section that are no longer relevant.
	&lt;ul&gt;
		&lt;li&gt;&quot;max target available snapshots window size in seconds&#8221;&lt;/li&gt;
		&lt;li&gt;&quot;target available snapshots window size in seconds&quot;&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Add metric &quot;minimum target snapshots window size in seconds&quot;.&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="1343702">DOCS-13635</key>
            <summary>Investigate changes in SERVER-47672: Add minSnapshotHistoryWindowInSeconds parameter</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="naomi.pentrel@mongodb.com">Naomi Pentrel</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 May 2020 20:01:38 +0000</created>
                <updated>Mon, 13 Nov 2023 18:05:31 +0000</updated>
                            <resolved>Wed, 24 Feb 2021 13:35:41 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3632558" author="xgen-internal-githook" created="Wed, 24 Feb 2021 14:46:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Naomi Pentrel&apos;, &apos;email&apos;: &apos;5212232+npentrel@users.noreply.github.com&apos;, &apos;username&apos;: &apos;npentrel&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13635&quot; title=&quot;Investigate changes in SERVER-47672: Add minSnapshotHistoryWindowInSeconds parameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13635&quot;&gt;&lt;del&gt;DOCS-13635&lt;/del&gt;&lt;/a&gt; add minSnapshotHistoryWindowInSeconds&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/59beccfd63f779b829a6167f7f96a95a484e4d21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/59beccfd63f779b829a6167f7f96a95a484e4d21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3274766" author="lingzhi.deng" created="Wed, 8 Jul 2020 14:14:31 +0000"  >&lt;p&gt;Snapshot reads that are older than minSnapshotHistoryWindowInSeconds will return &lt;tt&gt;SnapshotTooOld&lt;/tt&gt; errors.&lt;/p&gt;</comment>
                            <comment id="3274756" author="lingzhi.deng" created="Wed, 8 Jul 2020 14:12:25 +0000"  >&lt;p&gt;In sharded clusters, specifying &lt;tt&gt;minSnapshotHistoryWindowInSeconds&lt;/tt&gt; against the config servers will also make them keep minSnapshotHistoryWindowInSeconds of chunk history.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                                                <inwardlinks description="is related to">
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