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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-366] btree exent freeing</title>
                <link>https://jira.mongodb.org/browse/SERVER-366</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;ensure btree frees extent on dropIndex&lt;/li&gt;
	&lt;li&gt;when done with a btree node on delete, return it&lt;/li&gt;
	&lt;li&gt;Maybe we should clear out childless unused nodes in pack() (from aaron)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="10760">SERVER-366</key>
            <summary>btree exent freeing</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="aaron">Aaron Staple</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Oct 2009 15:46:40 +0000</created>
                <updated>Tue, 12 Jul 2016 00:28:09 +0000</updated>
                            <resolved>Tue, 29 Jun 2010 15:37:56 +0000</resolved>
                                                    <fixVersion>1.5.4</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>13</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="15563" author="auto" created="Thu, 8 Jul 2010 04:44:32 +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-366&quot; title=&quot;btree exent freeing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-366&quot;&gt;&lt;del&gt;SERVER-366&lt;/del&gt;&lt;/a&gt; pos can be n&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/9e5bbc39739e1a6df6430c3bc4b2a938959c5985&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/9e5bbc39739e1a6df6430c3bc4b2a938959c5985&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="15558" author="auto" created="Thu, 8 Jul 2010 01:44:47 +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-366&quot; title=&quot;btree exent freeing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-366&quot;&gt;&lt;del&gt;SERVER-366&lt;/del&gt;&lt;/a&gt; don&apos;t drop referenced key&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/ec28a6971bf0b780548b7417bac98fe4b669b542&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/ec28a6971bf0b780548b7417bac98fe4b669b542&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="15179" author="aaron" created="Tue, 29 Jun 2010 13:15:26 +0000"  >&lt;p&gt;I&apos;ve implemented everything in the description.  Let me know if we need anything more.&lt;/p&gt;</comment>
                            <comment id="15151" author="auto" created="Tue, 29 Jun 2010 01:16:56 +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-366&quot; title=&quot;btree exent freeing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-366&quot;&gt;&lt;del&gt;SERVER-366&lt;/del&gt;&lt;/a&gt; clean up a bit in pack()&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/1e934132ad096c467d5ab41d0b16f492b0200fb0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/1e934132ad096c467d5ab41d0b16f492b0200fb0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="14800" author="aaron" created="Tue, 15 Jun 2010 16:13:56 +0000"  >&lt;p&gt;FYI looks like there is a higher level guard in place to prevent the the background operation/dropping issue I described above.&lt;/p&gt;</comment>
                            <comment id="14797" author="auto" created="Tue, 15 Jun 2010 15:38:23 +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-366&quot; title=&quot;btree exent freeing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-366&quot;&gt;&lt;del&gt;SERVER-366&lt;/del&gt;&lt;/a&gt; simplify indexh test&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/0676284bb13c252782c3f6a9343c6e4140ca799e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/0676284bb13c252782c3f6a9343c6e4140ca799e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="14796" author="auto" created="Tue, 15 Jun 2010 14:41:10 +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-366&quot; title=&quot;btree exent freeing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-366&quot;&gt;&lt;del&gt;SERVER-366&lt;/del&gt;&lt;/a&gt; debug indexh failure&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/a739b8df76503cb3a71d823791d3d859dbb6afda&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/a739b8df76503cb3a71d823791d3d859dbb6afda&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="14792" author="eliot" created="Tue, 15 Jun 2010 11:28:45 +0000"  >&lt;p&gt;You can make a separate case for that.&lt;br/&gt;
Maybe assign to dwight to see what he wants to do&lt;/p&gt;</comment>
                            <comment id="14761" author="auto" created="Mon, 14 Jun 2010 18:48:13 +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-366&quot; title=&quot;btree exent freeing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-366&quot;&gt;&lt;del&gt;SERVER-366&lt;/del&gt;&lt;/a&gt; btree extent and node freeing&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/d782c98f9cf998eb2bd1dac6850c4c8a54e99fd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/d782c98f9cf998eb2bd1dac6850c4c8a54e99fd1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="14753" author="aaron" created="Mon, 14 Jun 2010 16:56:00 +0000"  >&lt;p&gt;One of the requirements is to ensure the extent is freed on dropIndex.  Extent freeing happens now in general, but if there is a background operation in progress it looks like the index will be dropped but its extents won&apos;t be freed.  Is fixing this something I should work on now?&lt;/p&gt;</comment>
                            <comment id="12744" author="aaron" created="Thu, 4 Mar 2010 16:07:56 +0000"  >&lt;p&gt;It might be worthwhile to also spending some time studying how balanced our btrees are under various pathological operation sequences.&lt;/p&gt;</comment>
                            <comment id="12205" author="aaron" created="Mon, 8 Feb 2010 20:59:47 +0000"  >&lt;p&gt;We should be careful when doing this to preserve the invariant expected in BtreeBucket::advance() that every bucket has at least one key.  (Or alternatively we could make the invariant more flexible).&lt;/p&gt;</comment>
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