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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1969] Arbiter allocates capped local.oplog.rs collection (unnecessarily?)</title>
                <link>https://jira.mongodb.org/browse/SERVER-1969</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When an arbiter is added to a replicaset it allocates a large chunk of disk for the oplog which is not needed (and def. not at that size).&lt;/p&gt;

&lt;p&gt;This will cause problems for people trying to use 32bit machines for this purpose. &lt;/p&gt;</description>
                <environment></environment>
        <key id="13420">SERVER-1969</key>
            <summary>Arbiter allocates capped local.oplog.rs collection (unnecessarily?)</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="kristina">Kristina Chodorow</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Oct 2010 06:57:53 +0000</created>
                <updated>Tue, 12 Jul 2016 00:20:08 +0000</updated>
                            <resolved>Thu, 21 Oct 2010 20:13:11 +0000</resolved>
                                    <version>1.6.0</version>
                                    <fixVersion>1.7.2</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="19453" author="auto" created="Thu, 21 Oct 2010 20:10:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;kchodorow&apos;, &apos;name&apos;: &apos;Kristina Chodorow&apos;, &apos;email&apos;: &apos;kristina@10gen.com&apos;}
&lt;p&gt;Message: don&apos;t allocate oplog for arbiter &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1969&quot; title=&quot;Arbiter allocates capped local.oplog.rs collection (unnecessarily?)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1969&quot;&gt;&lt;del&gt;SERVER-1969&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/57aecc7f77f848935c4fd946eb16cf55bb77993b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/57aecc7f77f848935c4fd946eb16cf55bb77993b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="19412" author="scotthernandez" created="Wed, 20 Oct 2010 20:31:08 +0000"  >&lt;p&gt;What about not allocating the oplog until a replicaset is initialized/configured on that node? Why does it need to exist before being configured/init&apos;d?&lt;/p&gt;

&lt;p&gt;It would require a --repair/repairDatabase to release the space if it is dropped and re-created. In most cases a repair on the local db will be extremely fast, and also once auto-compaction (assuming it will release disk space) is implemented then that could help as well.&lt;/p&gt;</comment>
                            <comment id="19410" author="kristina" created="Wed, 20 Oct 2010 20:23:14 +0000"  >&lt;p&gt;We recommend people start arbiters with --oplogSize 1, I&apos;m not sure what else can be done here.  Maybe the --arbiter command line option should set --oplogSize to 1 if used with --replSet.&lt;/p&gt;

&lt;p&gt;The problem is that by the time you initialize the replica set (and the arbiter knows it&apos;s going to be an arbiter), the oplog&apos;s already been allocated.  We could drop the oplog at that point, but it won&apos;t actually free the space (since MongoDB holds freed collection space in reserve to use later).&lt;/p&gt;</comment>
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