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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>
    </build-info>


<item>
            <title>[SERVER-28248] stale secondary pings the primary to refresh chunks and waits for updates to propagate</title>
                <link>https://jira.mongodb.org/browse/SERVER-28248</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The secondary must know how long to wait for the latest chunk metadata to replicate to it, so it can refresh successfully.&lt;/p&gt;

&lt;p&gt;The command will return the optime of the last chunk metadata write on the primary. The shard primary must always stash the optime of the last chunk metadata write from each refresh, so that it can be returned it if the secondary calls. If the command causes the primary to refresh, it will refresh and return the optime from that chunk metadata write operation. The secondary must send the expectedShardVersion in the command to the primary, in case the primary must go to the config server to refresh.&lt;/p&gt;</description>
                <environment></environment>
        <key id="362516">SERVER-28248</key>
            <summary>stale secondary pings the primary to refresh chunks and waits for updates to propagate</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="9">Done</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Mar 2017 16:53:31 +0000</created>
                <updated>Wed, 6 Dec 2017 21:13:03 +0000</updated>
                            <resolved>Thu, 6 Jul 2017 21:05:22 +0000</resolved>
                                                    <fixVersion>3.5.10</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1615683" author="xgen-internal-githook" created="Thu, 6 Jul 2017 21:05:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;EshaMaharishi&apos;, u&apos;name&apos;: u&apos;Esha Maharishi&apos;, u&apos;email&apos;: u&apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28248&quot; title=&quot;stale secondary pings the primary to refresh chunks and waits for updates to propagate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28248&quot;&gt;&lt;del&gt;SERVER-28248&lt;/del&gt;&lt;/a&gt; stale secondary pings the primary to refresh chunks and waits for updates to propagate&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5020fa1cb2ac9364f29f52bd14b49224ddc43c93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5020fa1cb2ac9364f29f52bd14b49224ddc43c93&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1614215" author="xgen-internal-githook" created="Wed, 5 Jul 2017 16:13:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28248&quot; title=&quot;stale secondary pings the primary to refresh chunks and waits for updates to propagate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28248&quot;&gt;&lt;del&gt;SERVER-28248&lt;/del&gt;&lt;/a&gt; Fix move construction of NamespaceMetadataChangeNotifications::ScopedNotification&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/390bb2badbc53345945b83fdcb2402f3f9cb4964&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/390bb2badbc53345945b83fdcb2402f3f9cb4964&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1611807" author="xgen-internal-githook" created="Fri, 30 Jun 2017 19:44:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28248&quot; title=&quot;stale secondary pings the primary to refresh chunks and waits for updates to propagate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28248&quot;&gt;&lt;del&gt;SERVER-28248&lt;/del&gt;&lt;/a&gt; Use Notification&amp;lt;void&amp;gt; in the VersionNotifications class&lt;/p&gt;

&lt;p&gt;And rename the class to NamespaceMetadataChangeNotifications to better&lt;br/&gt;
reflect its new simplified purpose.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ebb1e4c6192bcf440ff008222689ec5f0a7a2d57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ebb1e4c6192bcf440ff008222689ec5f0a7a2d57&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1594696" author="esha.maharishi@10gen.com" created="Mon, 12 Jun 2017 18:34:04 +0000"  >&lt;p&gt;Meh, I dunno. I think as long as this map exists somewhere, and a client thread can specify its wantedVersion (possibly something we&apos;ll have to wire in), things should work...&lt;/p&gt;</comment>
                            <comment id="1594692" author="esha.maharishi@10gen.com" created="Mon, 12 Jun 2017 18:31:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee&quot;&gt;dianna.hohensee&lt;/a&gt;, ok, we were thinking of making the OpObserver on the secondary update a map on the chunk loader, something like&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;map&amp;lt;string, pair&amp;lt;Notification, ChunkVersion&amp;gt;&amp;gt; latestVersion&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;where the string is the collection name (or later UUID).&lt;/p&gt;

&lt;p&gt;The notification would be signaled when latestVersion is updated, and the client threads would wait a signal for their desired collection.&lt;/p&gt;

&lt;p&gt;Based on what you said about the secondary shard&apos;s OpObserver invalidating cached chunk metadata on the CatalogCache, perhaps it makes more sense for the CatalogCache to own this map?&lt;/p&gt;
</comment>
                            <comment id="1594674" author="dianna.hohensee" created="Mon, 12 Jun 2017 18:18:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29239&quot; title=&quot;Make shard secondaries refresh from shard persisted metadata store&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29239&quot;&gt;&lt;del&gt;SERVER-29239&lt;/del&gt;&lt;/a&gt; will need notification objects as well, so the secondary can avoid using sleepmillis when waiting for a refresh that has already started to finish before proceeding to read the shard persisted chunk metadata. So I&apos;ll add the notifications map in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29239&quot; title=&quot;Make shard secondaries refresh from shard persisted metadata store&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29239&quot;&gt;&lt;del&gt;SERVER-29239&lt;/del&gt;&lt;/a&gt;, making it generically usable for both scenarios, and including cleanup of the map when collections are deleted. This ticket and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29239&quot; title=&quot;Make shard secondaries refresh from shard persisted metadata store&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29239&quot;&gt;&lt;del&gt;SERVER-29239&lt;/del&gt;&lt;/a&gt; will have separate code using the notifications.&lt;/p&gt;</comment>
                            <comment id="1594657" author="dianna.hohensee" created="Mon, 12 Jun 2017 18:10:53 +0000"  >&lt;p&gt;The secondary will not have a wantedVersion to send to the shard chunk loader for refresh. For example, a secondary shard OpObserver will invalidate the cached chunk metadata on the CatalogCache. The CatalogCache will eventually get a caller asking for the chunk metadata, and see its cache is invalid (needsRefresh), then tell the shard chunk loader to refresh, without telling it what to refresh to.&lt;/p&gt;</comment>
                            <comment id="1589626" author="kaloian.manassiev" created="Wed, 7 Jun 2017 12:29:00 +0000"  >&lt;p&gt;The first caller which installs the notification must call into the primary to force it to do refresh (even if it is a noop refresh).&lt;/p&gt;</comment>
                            <comment id="1589623" author="esha.maharishi@10gen.com" created="Wed, 7 Jun 2017 12:26:42 +0000"  >&lt;p&gt;I don&apos;t think it works if you don&apos;t hold the mutex while reading the collection :/&lt;/p&gt;

&lt;p&gt;Consider:&lt;/p&gt;

&lt;p&gt;Thread 1 reads the collection, finds it stale.&lt;br/&gt;
The collection gets refreshed and the OpObserver thread sees no entry for the collection, so doesn&apos;t signal anything.&lt;br/&gt;
Thread 1 locks the mutex, installs a notification, and waits on it.&lt;/p&gt;

&lt;p&gt;Even if some second client thread has installed the notification so it does get signaled by the OpObserver, the first client thread can get stuck:&lt;/p&gt;

&lt;p&gt;Thread 1 reads the collection, finds it stale&lt;br/&gt;
Thread 2 reads the collection, finds it stale&lt;br/&gt;
Thread 2 locks the mutex and installs the notification&lt;br/&gt;
The OpObserver signals the notification, then removes it from the map&lt;br/&gt;
Thread 2 wakes up and sees the refreshed chunks&lt;br/&gt;
Thread 1 locks the mutex and installs a new notification and waits on it.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;?&lt;/p&gt;</comment>
                            <comment id="1589533" author="kaloian.manassiev" created="Wed, 7 Jun 2017 09:25:04 +0000"  >&lt;p&gt;This looks good to me and like a better option than adding a synchronous refresh option to the CatalogCache, which is what I was trying to propose yesterday.&lt;/p&gt;

&lt;p&gt;I have one suggestion though, because I see a possible race condition between checking whether the persisted version in the admin.system.chunks collections has been reached and proceeding to wait for the notification. This check is not atomic because you can&apos;t hold a mutex while reading the collection. Similar race condition exists with purging the notification entries.&lt;/p&gt;

&lt;p&gt;What I suggest is:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Check if the on-disk version is LT what is expected and if not, no need to wait&lt;/li&gt;
	&lt;li&gt;Else, take the mutex protecting &lt;tt&gt;_refreshNotifications&lt;/tt&gt;, install a shared_ptr notification if necessary (or if one already exists, get it), unlock the mutex and start waiting on the notification&lt;/li&gt;
	&lt;li&gt;When signaled, loop again and keep doing the same until the on-disk version becomes GTE what is expected&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In the OpObserver, just take the &lt;tt&gt;_refreshNotifications&lt;/tt&gt; mutex, check if there is an entry for the namespace and if there is, signal it and remove it right away. That way don&apos;t need to worry about purging or associating the notification with a particular version, just plain old notification that something in a collection has changed. I would also check that we don&apos;t have such a mechanism in place for capped collections or for exhaust cursors, which could be reused (although I doubt it).&lt;/p&gt;</comment>
                            <comment id="1589362" author="esha.maharishi@10gen.com" created="Wed, 7 Jun 2017 01:40:58 +0000"  >&lt;p&gt;Since we realized we&apos;ll need to plug in some notification machinery on the primary to wait for the (async) writes to the chunks collection, I thought it might be easier to just:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;add an OpObserver that signals a notification when a particular collection has been refreshed, along with the refreshed-to version&lt;/li&gt;
	&lt;li&gt;wait (in a loop) on one thread for the signal that the collection has been refreshed to the wantedVersion&lt;/li&gt;
	&lt;li&gt;ping the primary on another thread using any existing command with the wanted shardVersion attached&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Suggested implementation:&lt;/p&gt;

&lt;p&gt;Put a map&amp;lt;NamespaceString, Notification&amp;gt; (where the string key is the full namespace, or later database name + UUID?) in the ShardServerCatalogCacheLoader.&lt;/p&gt;

&lt;p&gt;Then add a signalCollectionRefreshed() and waitForCollectionRefresh() to it. Only the thread that waits to get the signal adds entries to the map.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;stdx::mutex _mutex;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;map&amp;lt;NamespaceString, shared_ptr&amp;lt;Notification&amp;gt;&amp;gt; _refreshNotifications;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;waitForCollectionRefreshIfNeeded(OperationContext* opCtx, NamespaceString nss, ChunkVersion wantedVersion) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    stdx::lock_guard&amp;lt;stdx::mutex&amp;gt; lock(_mutex);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // Read the local data on disk to see if we already are at wantedVersion&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // If not, schedule an asynchronous task to ping the primary and start waiting for the refresh notification.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // Because we are under the lock between checking the local data and waiting,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // we are guaranteed to receive the signal after we start waiting&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // even if the writes come in before we go to sleep,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // because the OpObserver won&apos;t be able to take the lock to send the signal until we sleep&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    if (_refreshNotifications.find(nss) == _refreshNotifications.end()) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        // This is the first thread to wait for this collection&apos;s refresh. Add an entry to the map.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        _refreshNotifications.insert(make_pair&amp;lt;NamespaceString, shared_ptr&amp;lt;Notification&amp;gt;&amp;gt;(nss, std::make_shared&amp;lt;Notification&amp;gt;()));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    ChunkVersion foundVersion;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    do {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        // The wait is interruptible, because opCtx is passed.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        // TODO: do we have to unlock _mutex manually around this wait?&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        foundVersion = _refreshNotifications.find(nss)-&amp;gt;second-&amp;gt;get(opCtx);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    } while (foundVersion &amp;lt; wantedVersion);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;signalCollectionRefresh(NamespaceString nss, ChunkVersion newVersion) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    stdx::lock_guard&amp;lt;stdx::mutex&amp;gt; lock(_mutex);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    auto it = _refreshNotifications.find(nss);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    if (it == _refreshNotifications.end()) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        // No one was waiting or has ever waited for this collection&apos;s refresh.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        return;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    it-&amp;gt;second-&amp;gt;signal(newVersion);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // Replace the notification with a new one, since each can only be signaled once.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    it-&amp;gt;second = make_shared&amp;lt;Notification&amp;gt;();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Called on dropCollection&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;purgeCollectionEntry(NamespaceString nss) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    stdx::lock_guard&amp;lt;stdx::mutex&amp;gt; lock(_mutex);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    _refreshNotifications.erase(_refreshNotifications.find(nss));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1584225" author="dianna.hohensee" created="Wed, 31 May 2017 19:47:11 +0000"  >&lt;p&gt;There are two ways to do this, an optimized solution and an unoptimized one. Whatever the command used, the secondary will send a nss and shardVersion to the primary and then expect to get back an optime upon which to wait to ensure that the latest metadata has finished propagating to the secondary before the secondary attempts to load it.&lt;/p&gt;

&lt;p&gt;Where the code should go:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;place an anonymous function on the shard chunk loader that takes a namespace and version. This function will execute the command to the primary, parse the command response for the optime, and then wait on that optime before returning. Probably just need to return a Status.&lt;/li&gt;
	&lt;li&gt;Note: there is as of yet no place to call this function, because &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29239&quot; title=&quot;Make shard secondaries refresh from shard persisted metadata store&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29239&quot;&gt;&lt;del&gt;SERVER-29239&lt;/del&gt;&lt;/a&gt; is adding that code. The new function will be the first thing that the secondary shard chunk loader does on refresh.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Unoptimized solution:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;use setShardVersion to force a metadata refresh on the primary, if primary is staler than the version sent. Parse the command response for the primary&apos;s last applied optime &amp;#8211; supposedly this is returned, I have not confirmed. Wait on that optime. ReplicationCoordinator and read_concern.cpp have wait for optime functions that may work for this use case or contain code that can be used to create a new helper function.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Optimized solution:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;If we wish to use the more optimized approached, a new command must be created to retrieve the special collection specific metadata write optimes from the shard chunk loader, as well as new code for the shard chunk loader to store the optimes of its writes per collection.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Either approach is complicated by the fact that forcing a refresh doesn&apos;t force persistence of that metadata. The shard chunk loader persists metadata asynchronously, so it seems like we must wire in an additional notification somehow to wait for a particular Task to finish in the chunk loader. Perhaps expose a function on ShardServerCatalogCacheLoader, &apos;Notification&amp;amp; registerNotification(nss, version)&quot;, and whenever a Task is complete, check whether we have a notification registered and whether the task applied the desired version for nss. This actually means that there may not be a way to avoid making a new command.&lt;/p&gt;

&lt;hr /&gt;

&lt;p&gt;For either solution, I think we actually will need the secondary to know to which version it should be refreshing to when its metadata is invalidated &amp;#8211; say by a moveChunk moving out a chunk on the primary and then updating its metadata, which will (soon) cause an opobserver on the secondary to invalidate the secondary&apos;s chunk metadata cache for that collection. This will be done in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29437&quot; title=&quot;Change ShardCollectionType::refreshSequenceNumber from a long to a ChunkVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29437&quot;&gt;&lt;del&gt;SERVER-29437&lt;/del&gt;&lt;/a&gt; by changing the ShardCollectionType::refreshSequenceNumber to a ChunkVersion, and does not hold up this ticket.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="384099">SERVER-29239</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
                                        <issuelink>
            <issuekey id="377150">SERVER-28948</issuekey>
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