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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-595] restarting replication - making finding first object fast</title>
                <link>https://jira.mongodb.org/browse/SERVER-595</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Scanning backwards can be really slow if replication was paused for significant time.&lt;/p&gt;

&lt;p&gt;Theory: scanning backwards is horribly slow because every 4k have to seek&lt;/p&gt;

&lt;p&gt;Solution:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;scan bacwards as we do now for 5 seconds.&lt;/li&gt;
	&lt;li&gt;if the starting point is not found, find the extent which the object should be in by looking at first object in each extent&lt;/li&gt;
	&lt;li&gt;then scan forwards in that extent - which should be very fast&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If we can do this simply - might be worth backporting to 1.2.x&lt;/p&gt;</description>
                <environment></environment>
        <key id="11237">SERVER-595</key>
            <summary>restarting replication - making finding first object fast</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="aaron">Aaron Staple</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Feb 2010 09:52:38 +0000</created>
                <updated>Tue, 12 Jul 2016 00:28:40 +0000</updated>
                            <resolved>Tue, 2 Feb 2010 16:41:06 +0000</resolved>
                                                    <fixVersion>1.3.2</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="12166" author="auto" created="Sat, 6 Feb 2010 18:01:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;astaple&apos;, &apos;name&apos;: &apos;Aaron&apos;, &apos;email&apos;: &apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-595&quot; title=&quot;restarting replication - making finding first object fast&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-595&quot;&gt;&lt;del&gt;SERVER-595&lt;/del&gt;&lt;/a&gt; be sure to release mutex in corner case when scan from beginning&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/1d562aeb9b3c19ff2d062627927313ce455a2ee7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/1d562aeb9b3c19ff2d062627927313ce455a2ee7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="12089" author="aaron" created="Tue, 2 Feb 2010 16:42:34 +0000"  >&lt;p&gt;I can&apos;t do the backport w/o some instructions.  Let me know if you want me to work on that.  Might want to test new code in your production environment first though.&lt;/p&gt;</comment>
                            <comment id="12087" author="auto" created="Tue, 2 Feb 2010 15:53:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;astaple&apos;, &apos;name&apos;: &apos;Aaron&apos;, &apos;email&apos;: &apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-595&quot; title=&quot;restarting replication - making finding first object fast&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-595&quot;&gt;&lt;del&gt;SERVER-595&lt;/del&gt;&lt;/a&gt; forgot to update matcher test for forward scan&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/ccf1d618f50f3e6cda67e8adfb2e0e1fd920d568&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/ccf1d618f50f3e6cda67e8adfb2e0e1fd920d568&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="12086" author="auto" created="Tue, 2 Feb 2010 15:44:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;astaple&apos;, &apos;name&apos;: &apos;Aaron&apos;, &apos;email&apos;: &apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-595&quot; title=&quot;restarting replication - making finding first object fast&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-595&quot;&gt;&lt;del&gt;SERVER-595&lt;/del&gt;&lt;/a&gt; add test&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/1b251ab297b1d9d8b938cda09648f73b5cac8880&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/1b251ab297b1d9d8b938cda09648f73b5cac8880&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="12085" author="auto" created="Tue, 2 Feb 2010 15:44:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;astaple&apos;, &apos;name&apos;: &apos;Aaron&apos;, &apos;email&apos;: &apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-595&quot; title=&quot;restarting replication - making finding first object fast&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-595&quot;&gt;&lt;del&gt;SERVER-595&lt;/del&gt;&lt;/a&gt; extent hopping implementation for findingStart mode&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/7f24acaf6d9b40fba1c685f1e22cc76291821952&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/7f24acaf6d9b40fba1c685f1e22cc76291821952&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="12075" author="eliot" created="Tue, 2 Feb 2010 13:05:17 +0000"  >&lt;p&gt;yes - we should still release the mutex like we do now&lt;/p&gt;</comment>
                            <comment id="12074" author="aaron" created="Tue, 2 Feb 2010 13:04:13 +0000"  >&lt;p&gt;Do we still want to release the mutex while doing this or not?&lt;/p&gt;</comment>
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