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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-52523] implement in-memory bucket catalog to support time-series collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-52523</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The bucket catalog serves two main purposes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Allow efficient discovery of buckets that are not full for given meta-data and time.&lt;/li&gt;
	&lt;li&gt;Synchronize and batch concurrent updates to the same bucket.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Proposed implementation details:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The global bucket catalog has an in-memory thread-safe ordered map indexed by a tuple &amp;lt;nss, metadata, _id&amp;gt;. For each bucket it contains:
	&lt;ul&gt;
		&lt;li&gt;A vector of measurements to be inserted.&lt;/li&gt;
		&lt;li&gt;The data size of the bucket, which is the total BSON size of the data object of the BSON serialization of the bucket, including measurements to be inserted.&lt;/li&gt;
		&lt;li&gt;The total number of measurements in the bucket, including uncommitted measurements and measurements to be inserted.&lt;/li&gt;
		&lt;li&gt;The number of committed measurements in the bucket.&lt;/li&gt;
		&lt;li&gt;The number of current writers.&lt;/li&gt;
		&lt;li&gt;A set containing all new top level field names of the measurements to be inserted.&lt;/li&gt;
		&lt;li&gt;The set of top level field names of the measurements that have been inserted into the bucket.&lt;/li&gt;
		&lt;li&gt;Most recent commit info, such as the timestamp, cluster time, etc. required for the update return.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;The catalog also has an &quot;idle bucket&quot; queue with references to all buckets that do not have writers. This queue allows expiring entries in the bucket catalog if their total size exceeds some (big) threshold. On step-down this queue is flushed, so the bucket catalog is empty.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1530753">SERVER-52523</key>
            <summary>implement in-memory bucket catalog to support time-series collections</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                    </labels>
                <created>Sat, 31 Oct 2020 16:25:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:01:03 +0000</updated>
                            <resolved>Wed, 25 Nov 2020 23:17:38 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3507570" author="xgen-internal-githook" created="Sat, 28 Nov 2020 13:28:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52523&quot; title=&quot;implement in-memory bucket catalog to support time-series collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52523&quot;&gt;&lt;del&gt;SERVER-52523&lt;/del&gt;&lt;/a&gt; fix mac os visibility builder&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/90c0b86cc3d75d66eee164ab786a5126e03233b9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/90c0b86cc3d75d66eee164ab786a5126e03233b9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3506068" author="xgen-internal-githook" created="Wed, 25 Nov 2020 23:03:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52523&quot; title=&quot;implement in-memory bucket catalog to support time-series collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52523&quot;&gt;&lt;del&gt;SERVER-52523&lt;/del&gt;&lt;/a&gt; Implement in-memory time-series bucket catalog&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/82aea1d428e3a06994d6624464b74b92e47eae2d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/82aea1d428e3a06994d6624464b74b92e47eae2d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1530751">SERVER-52522</issuekey>
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            <issuekey id="1551580">SERVER-53072</issuekey>
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