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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-31584] limit initial sync lookahead buffer by size during oplog application phase</title>
                <link>https://jira.mongodb.org/browse/SERVER-31584</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Initial sync uses a lookahead buffer, introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26191&quot; title=&quot;OplogBufferCollection should batch reads from collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26191&quot;&gt;&lt;del&gt;SERVER-26191&lt;/del&gt;&lt;/a&gt;) to read from the temporary oplog buffer collection during the oplog application phase. The size of this buffer is currently specified in terms of the number of documents it can contain. The current default of 10,000, which suggests that this cache can hold up to 160 GB of data, may result in OOM errors.&lt;/p&gt;

&lt;p&gt;We should either reduce the default to a more reasonable number, or constrain the size of the buffer by the total size of all buffered documents.&lt;/p&gt;

&lt;p&gt;------------------------- OLD DESCRIPTION BELOW -------------------&lt;/p&gt;

&lt;p&gt;In the following example the oplog application phase used ~6 GB of memory. This can lead to OOM during initial sync.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/168337/168337_applier.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;In the above example &quot;A&quot; corresponds to the following:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2017-10-13T03:44:10.775-0500 I REPL     [replication-140] Applying operations until { : Timestamp 1507884249000|1 } before initial sync can complete. (starting at { : Timestamp 1507832798000|1 })&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;The memory was allocated by this stack:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2017-10-13T03:44:11.064-0500 I -        [ftdc] heapProfile stack1651: { 0: &quot;tc_malloc&quot;, 1: &quot;mongo::mongoMalloc&quot;, 2: &quot;mongo::BSONObj::copy&quot;, 3: &quot;mongo::BSONObj::getOwned&quot;, 4: &quot;0x7f734da6c793&quot;, 5: &quot;mongo::repl::StorageInterfaceImpl::findDocuments&quot;, 6: &quot;mongo::repl::OplogBufferCollection::_peek_inlock&quot;, 7: &quot;mongo::repl::OplogBufferCollection::peek&quot;, 8: &quot;mongo::repl::OplogBufferProxy::peek&quot;, 9: &quot;mongo::repl::InitialSyncer::_getNextApplierBatch_inlock&quot;, 10: &quot;mongo::repl::InitialSyncer::_getNextApplierBatchCallback&quot;, 11: &quot;std::_Function_handler&amp;lt;void &quot;, 12: &quot;mongo::executor::ThreadPoolTaskExecutor::runCallback&quot;, 13: &quot;0x7f734dd2866b&quot;, 14: &quot;mongo::ThreadPool::_doOneTask&quot;, 15: &quot;mongo::ThreadPool::_consumeTasks&quot;, 16: &quot;mongo::ThreadPool::_workerThreadBody&quot;, 17: &quot;0x7f734ea0a0f0&quot;, 18: &quot;0x7f7349767dc5&quot;, 19: &quot;clone&quot; }&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="446074">SERVER-31584</key>
            <summary>limit initial sync lookahead buffer by size during oplog application phase</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>RF36</label>
                            <label>initialSync</label>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 16 Oct 2017 16:18:46 +0000</created>
                <updated>Tue, 22 Aug 2023 14:20:18 +0000</updated>
                            <resolved>Tue, 22 Aug 2023 14:20:18 +0000</resolved>
                                    <version>3.4.6</version>
                    <version>3.6.0</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>20</watches>
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            <issuekey id="317508">SERVER-26191</issuekey>
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                            <attachment id="168337" name="applier.png" size="121521" author="bruce.lucas@mongodb.com" created="Mon, 16 Oct 2017 16:18:42 +0000"/>
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