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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>[SERVER-47672] Add minSnapshotHistoryWindowInSeconds parameter</title>
                <link>https://jira.mongodb.org/browse/SERVER-47672</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;</description>
                <environment></environment>
        <key id="1323340">SERVER-47672</key>
            <summary>Add minSnapshotHistoryWindowInSeconds parameter</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 Apr 2020 20:33:22 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:15 +0000</updated>
                            <resolved>Thu, 7 May 2020 20:01:38 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3074605" author="xgen-internal-githook" created="Thu, 7 May 2020 19:42:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47672&quot; title=&quot;Add minSnapshotHistoryWindowInSeconds parameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47672&quot;&gt;&lt;del&gt;SERVER-47672&lt;/del&gt;&lt;/a&gt;: Add minSnapshotHistoryWindowInSeconds and remove snapshot window adjustment logic&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/db37687407c8f84f42afa87ba0d0c14bcbf35140&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/db37687407c8f84f42afa87ba0d0c14bcbf35140&lt;/a&gt;&lt;/p&gt;</comment>
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                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1329660">SERVER-47785</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1329661">SERVER-47786</issuekey>
        </issuelink>
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            <issuekey id="1343702">DOCS-13635</issuekey>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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            <issuekey id="1329661">SERVER-47786</issuekey>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1334616">SERVER-47855</issuekey>
        </issuelink>
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                            <customfieldvalue>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;br/&gt;
&lt;br/&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;br/&gt;
&lt;br/&gt;
Deleted metrics in the &amp;quot;snapshot-window-settings&amp;quot; subsection of the wiredTiger serverStatus section that are no longer relevant.&lt;br/&gt;
- &amp;quot;max target available snapshots window size in seconds&#8221;&lt;br/&gt;
- &amp;quot;target available snapshots window size in seconds&amp;quot;&lt;br/&gt;
&lt;br/&gt;
Add metric &amp;quot;minimum target snapshots window size in seconds&amp;quot; in the &amp;quot;snapshot-window-settings&amp;quot; subsection of the wiredTiger serverStatus section -- this reports the minSnapshotHistoryWindowInSeconds configuration.</customfieldvalue>

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