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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-29150] Oplog/Snapshot/Memory</title>
                <link>https://jira.mongodb.org/browse/SERVER-29150</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If allow readMajority, snapshotManager will be opened on mongo-wt or mongorocks.&lt;br/&gt;
We assume there are 2 secondaries after a primary.&lt;br/&gt;
One snapshot(exactly saying, one in snapshotmanager, one in repl module, about 8+8*2 = 24 bytes) will be held for each oplog entry in memory, &lt;br/&gt;
If both of the two secondaries are almost stale(but still catches with primary), snapshot will not be committed, neither memory nor disk can not be released, it can be quite dangerous.Am I right?&lt;/p&gt;

&lt;p&gt;My question is: &lt;br/&gt;
1) If both secondaries are stale, but primary still alives and keeps writing. More snapshots will be generated, Does it lead to an oom finally ?&lt;br/&gt;
2) Plz figure out the misunderstandings above, thanks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="382792">SERVER-29150</key>
            <summary>Oplog/Snapshot/Memory</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="-1">Unassigned</assignee>
                                    <reporter username="wolf_kdy">deyukong</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 May 2017 18:17:21 +0000</created>
                <updated>Fri, 12 May 2017 15:42:16 +0000</updated>
                            <resolved>Fri, 12 May 2017 13:57:02 +0000</resolved>
                                                                    <component>Internal Code</component>
                    <component>Replication</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1569738" author="wolf_kdy" created="Fri, 12 May 2017 15:22:13 +0000"  >&lt;p&gt;thanks for your reply.&lt;br/&gt;
I will forward this issue to the dev group.&lt;br/&gt;
I read too fast and ignored shouldSleepMore, which will control the max snapshot nums.&lt;/p&gt;</comment>
                            <comment id="1569630" author="milkie" created="Fri, 12 May 2017 13:56:51 +0000"  >&lt;p&gt;Thanks for your report. Please note that SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-developer related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-dev&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-dev group&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-dev group.&lt;/p&gt;</comment>
                            <comment id="1569625" author="milkie" created="Fri, 12 May 2017 13:52:39 +0000"  >&lt;p&gt;In your scenario, as more writes happen, the WiredTiger cache will eventually fill up with update data.  This data is then spilled to disk in a LAS (lookaside) file.  While performance will suffer when this happens, it should not run out of memory.&lt;/p&gt;</comment>
                            <comment id="1569546" author="milkie" created="Fri, 12 May 2017 12:54:10 +0000"  >&lt;p&gt;Named snapshots for the purposes of satisfying read-concern-majority are limited to 1000.  There is an algorithm that controls this at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3448ddb2ec7b3e210dfc97c0296dd7496f5c7813/src/mongo/db/repl/oplog.cpp#L1163&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/3448ddb2ec7b3e210dfc97c0296dd7496f5c7813/src/mongo/db/repl/oplog.cpp#L1163&lt;/a&gt;&lt;/p&gt;</comment>
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