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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-9335] prefetch/fault-in the tail of the oplog in large chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-9335</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We could prefetch/fault-in the tail of the oplog if we think that it is not in memory so when we go to delete the docs to put new entries we don&apos;t block on the disk io. &lt;/p&gt;

&lt;p&gt;This could be done for all capped collections optionally.&lt;/p&gt;</description>
                <environment></environment>
        <key id="71564">SERVER-9335</key>
            <summary>prefetch/fault-in the tail of the oplog in large chunks</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Apr 2013 22:08:15 +0000</created>
                <updated>Mon, 11 Jul 2016 17:59:35 +0000</updated>
                            <resolved>Wed, 29 Jan 2014 19:03:35 +0000</resolved>
                                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="490240" author="xgen-internal-githook" created="Wed, 29 Jan 2014 18:16:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9335&quot; title=&quot;prefetch/fault-in the tail of the oplog in large chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9335&quot;&gt;&lt;del&gt;SERVER-9335&lt;/del&gt;&lt;/a&gt;: fix dbtests with new alloc code&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2bee3f018b8d4351f8261c405adcdff44c7f9a70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2bee3f018b8d4351f8261c405adcdff44c7f9a70&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="490238" author="xgen-internal-githook" created="Wed, 29 Jan 2014 18:16:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9335&quot; title=&quot;prefetch/fault-in the tail of the oplog in large chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9335&quot;&gt;&lt;del&gt;SERVER-9335&lt;/del&gt;&lt;/a&gt;: madvise sequenetial for all capped collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5f5ff9ef84c38e2b66cc9bb31ada12c4ed26c50&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5f5ff9ef84c38e2b66cc9bb31ada12c4ed26c50&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="490237" author="xgen-internal-githook" created="Wed, 29 Jan 2014 18:16:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9335&quot; title=&quot;prefetch/fault-in the tail of the oplog in large chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9335&quot;&gt;&lt;del&gt;SERVER-9335&lt;/del&gt;&lt;/a&gt;: remove addRecordToRecListInExtent and allocateSpaceForANewRecord from pdfile&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a2741dab6e7b447e610968002d835c60b7043773&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a2741dab6e7b447e610968002d835c60b7043773&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="490236" author="xgen-internal-githook" created="Wed, 29 Jan 2014 18:16:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9335&quot; title=&quot;prefetch/fault-in the tail of the oplog in large chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9335&quot;&gt;&lt;del&gt;SERVER-9335&lt;/del&gt;&lt;/a&gt;: don&apos;t call getCollection from NamesapceDetails&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2906d67b2f1d9e7feff5e679489e835c491ec8bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2906d67b2f1d9e7feff5e679489e835c491ec8bd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="490235" author="xgen-internal-githook" created="Wed, 29 Jan 2014 18:15:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9335&quot; title=&quot;prefetch/fault-in the tail of the oplog in large chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9335&quot;&gt;&lt;del&gt;SERVER-9335&lt;/del&gt;&lt;/a&gt;: some notion of interface is there now&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7c1edcfa9c017fc6bfdebdefeb918e2d91287d8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7c1edcfa9c017fc6bfdebdefeb918e2d91287d8f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="490234" author="xgen-internal-githook" created="Wed, 29 Jan 2014 18:15:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9335&quot; title=&quot;prefetch/fault-in the tail of the oplog in large chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9335&quot;&gt;&lt;del&gt;SERVER-9335&lt;/del&gt;&lt;/a&gt;: remove dead code from NamespaceDetails&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/266626f3bc8a61a452e774b42686161ea773923b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/266626f3bc8a61a452e774b42686161ea773923b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="490233" author="xgen-internal-githook" created="Wed, 29 Jan 2014 18:15:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9335&quot; title=&quot;prefetch/fault-in the tail of the oplog in large chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9335&quot;&gt;&lt;del&gt;SERVER-9335&lt;/del&gt;&lt;/a&gt;: move cap.cpp with namespace_details&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9e2ba4a31c95a00f4fcee8ffe316a9c8136f6a7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9e2ba4a31c95a00f4fcee8ffe316a9c8136f6a7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="318093" author="scotthernandez" created="Sun, 21 Apr 2013 13:59:22 +0000"  >&lt;p&gt;One way to implement this would be to use madvise MADV_SEQUENTIAL for the collection&apos;s extents and/or MADV_WILLNEED for the next part of the oplog (logical tail).&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="72145">SERVER-9378</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="13759">SERVER-2126</issuekey>
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