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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-59313] SCons cachedir symlink mode</title>
                <link>https://jira.mongodb.org/browse/SERVER-59313</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This was an idea I had while working on the PCH project and discovering that pch obj files are much larger and there fore slow down the cache due to increased transfer speed. The effects of this idea would be useful even outside of the context of PCH. This would be a special mode, intended for use in evergreen where we transfer a large amount of data over network from the scons cache EFS.&lt;/p&gt;

&lt;p&gt;The idea would be to make the cache use a symlink when copying from the cache instead of actually copying the file. There are probably some other places we will need to examine that are able to use the symlinks correctly, for example:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Does hardlink install action still work correctly?&lt;/li&gt;
	&lt;li&gt;Do packaging scripts work with these symlinked files?&lt;/li&gt;
	&lt;li&gt;To make sure the symlinked file doesn&apos;t drop out from under us while we are linked, we will need to make a hardlink inside the EFS, and symlink to that instead, and then delete the hardlink after the evergreen build is done?&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1850022">SERVER-59313</key>
            <summary>SCons cachedir symlink mode</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-devplatform">[DO NOT ASSIGN] Backlog - Server Development Platform Team (SDP)</assignee>
                                    <reporter username="daniel.moody@mongodb.com">Daniel Moody</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 Aug 2021 14:26:23 +0000</created>
                <updated>Fri, 27 Oct 2023 17:28:32 +0000</updated>
                            <resolved>Fri, 27 Oct 2023 17:28:32 +0000</resolved>
                                                    <fixVersion>6.0 Desired</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4001623" author="JIRAUSER1253549" created="Mon, 16 Aug 2021 15:40:34 +0000"  >&lt;p&gt;Stipulation posed by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt;:&lt;br/&gt;
&lt;em&gt;Reading the symlink will still force the data over the network anyways anytime the file is used, so this might not be really saving much.&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;possibly if we had cache=all, then in a hot cache situation it would not need to relink the libs and bins, but we would pay for uploading and storing a large amount of data generated from the linked files. Is the trade off worth it? We would probably be relinking a majority of the time in CI so this might not be feasible or useful change.&lt;/p&gt;</comment>
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