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    <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-59931] Improve defragmentation script</title>
                <link>https://jira.mongodb.org/browse/SERVER-59931</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;Defragmentation script&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Python degragmentation script improvements:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Phase 1 is not idempotent thus executing the same phase twice will over merge chunks,&#160;possibly producing chunks with sizes that are double the target chunk size.&lt;/li&gt;
	&lt;li&gt;Phase 2 always splits chunks in half without taking into account the real chunk size.&lt;/li&gt;
	&lt;li&gt;There is no way of throttling the migrations performed in phase 2&lt;/li&gt;
	&lt;li&gt;The progression bar is not accurate because it always accounts for all the chunks in the collection even if they are not going to be migrated.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;Performance evaluation&lt;/b&gt;&lt;br/&gt;
 In order to evaluate the impact of migrations after the defragmentation process we decided to run a few migrations after phase 1 and measure the time taken by the catalog cache refreshes and possibly the impact on a synthetic read workload. In order to perform this evaluation we will provide a new version of the defragmentation script with the following improvements:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Allow to run each phase separately, so that it will be possible to assess the performance after each phase.&lt;/li&gt;
	&lt;li&gt;Expose a parameter to limit the number of migrations performed in phase 2. So that the script can be also used to easily trigger a specific amount of migrations.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1873570">SERVER-59931</key>
            <summary>Improve defragmentation script</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="13201">Fixed</resolution>
                                        <assignee username="simon.gratzer@mongodb.com">Simon Gratzer</assignee>
                                    <reporter username="simon.gratzer@mongodb.com">Simon Gratzer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Sep 2021 10:32:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:38 +0000</updated>
                            <resolved>Fri, 1 Oct 2021 09:27:27 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4106347" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 17:22:36 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
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