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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-23775] oplog default size must be differently calculated for inMemory storage engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-23775</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If oplog size is not specified, we calculate it using default based on free space on disk.  This makes little sense for inMemory storage engine and will most likely &lt;b&gt;never&lt;/b&gt; be the right size.&lt;/p&gt;

&lt;p&gt;We should either fail to start if oplog size is not specified explicitly for a replica set member on startup, or we should calculate a different default, based on memory size (like we do cache) not based on disk size (and maybe give a warning in the logs that the size was not specified).&lt;/p&gt;</description>
                <environment></environment>
        <key id="280302">SERVER-23775</key>
            <summary>oplog default size must be differently calculated for inMemory storage engine</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Sun, 17 Apr 2016 15:04:36 +0000</created>
                <updated>Mon, 21 Nov 2016 19:27:35 +0000</updated>
                            <resolved>Wed, 20 Apr 2016 14:30:23 +0000</resolved>
                                                    <fixVersion>3.2.6</fixVersion>
                    <fixVersion>3.3.5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1239839" author="xgen-internal-githook" created="Tue, 19 Apr 2016 12:29:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23775&quot; title=&quot;oplog default size must be differently calculated for inMemory storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23775&quot;&gt;&lt;del&gt;SERVER-23775&lt;/del&gt;&lt;/a&gt; improved default oplog size for ephemeral storage engines&lt;/p&gt;

&lt;p&gt;(cherry picked from commit bdc06761206ac398af04f0a2eb482c4dca49bad8)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ae221cb5e40350c5d184f49400eacfa3e3526ee6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ae221cb5e40350c5d184f49400eacfa3e3526ee6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1239301" author="xgen-internal-githook" created="Mon, 18 Apr 2016 20:31:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23775&quot; title=&quot;oplog default size must be differently calculated for inMemory storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23775&quot;&gt;&lt;del&gt;SERVER-23775&lt;/del&gt;&lt;/a&gt; improved default oplog size for ephemeral storage engines&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bdc06761206ac398af04f0a2eb482c4dca49bad8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bdc06761206ac398af04f0a2eb482c4dca49bad8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1238988" author="milkie" created="Mon, 18 Apr 2016 17:47:31 +0000"  >&lt;p&gt;I kept it 50mb as the lower bound for in-memory.&lt;/p&gt;</comment>
                            <comment id="1238920" author="dan@10gen.com" created="Mon, 18 Apr 2016 17:12:24 +0000"  >&lt;p&gt;The default floor for &lt;tt&gt;inMemorySize&lt;/tt&gt; is currently 256MB in master.  See: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-7669&quot; title=&quot;wiredTigerCacheSizeGB, inMemorySizeGB default and floor lowered and can now be specified as a float&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-7669&quot;&gt;&lt;del&gt;DOCS-7669&lt;/del&gt;&lt;/a&gt;.  For 3.2 it is still 1GB&lt;/p&gt;</comment>
                            <comment id="1238805" author="milkie" created="Mon, 18 Apr 2016 15:58:17 +0000"  >&lt;p&gt;I didn&apos;t mention the floor but it currently is 990MB.&lt;/p&gt;

&lt;p&gt;my plan is to change it so that &quot;everything else&quot; is 990MB if disk-based storage; 50MB if ephemeral.  Does 200 sound better?&lt;/p&gt;</comment>
                            <comment id="1238758" author="asya" created="Mon, 18 Apr 2016 15:32:21 +0000"  >&lt;p&gt;That seems reasonable (and unlikely to ever get so high as to need the cap) though I wonder if it makes sense to have a floor for size of oplog - if total system memory is something low, like say 4GBs, cache will be just over 2GBs and oplog will be computed to be 200MBs... I guess that can be reasonable for small documents/relatively low write rate.&lt;/p&gt;</comment>
                            <comment id="1238610" author="milkie" created="Mon, 18 Apr 2016 14:31:18 +0000"  >&lt;p&gt;Current thinking is to use the same calculation as for disk (5% with a cap of 50 GB), but for total system memory (as opposed to free system memory).&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="280153">SERVER-23766</issuekey>
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