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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-34818] changeStream option startAtClusterTime should be a raw BSON Timestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-34818</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 4.0, we will be allowing users to specify a &lt;tt&gt;startAtClusterTime&lt;/tt&gt; option. Currently, the server expects the option to be a BSON document of the form:&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;   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;{ ts: Timestamp }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;This naming not intuitive, as a clusterTime object (as defined in server response &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.runCommand/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;$clusterTime.clusterTime&lt;/tt&gt;&lt;/a&gt;) does not conform to this format.&lt;/p&gt;

&lt;p&gt;We should either modify the &lt;tt&gt;startAtClusterTime&lt;/tt&gt; field to expect a raw BSON timestamp, or choose a more intuitive name for the field.&lt;/p&gt;</description>
                <environment></environment>
        <key id="538271">SERVER-34818</key>
            <summary>changeStream option startAtClusterTime should be a raw BSON Timestamp</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="daniel.aprahamian@mongodb.com">Daniel Aprahamian</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 May 2018 23:34:42 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:06 +0000</updated>
                            <resolved>Thu, 17 May 2018 14:30:29 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1893845" author="xgen-internal-githook" created="Thu, 17 May 2018 14:29:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;, &apos;name&apos;: &apos;Charlie Swanson&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34818&quot; title=&quot;changeStream option startAtClusterTime should be a raw BSON Timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34818&quot;&gt;&lt;del&gt;SERVER-34818&lt;/del&gt;&lt;/a&gt; Rename startAtClusterTime to startAtOperationTime&lt;/p&gt;

&lt;p&gt;Also changes the type of the argument from an object with a single &apos;ts&apos;&lt;br/&gt;
field to just a Timestamp.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/664e1d9b01dccddeec072b7746d7d4c62931716d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/664e1d9b01dccddeec072b7746d7d4c62931716d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1885367" author="spencer" created="Mon, 7 May 2018 23:17:25 +0000"  >&lt;p&gt;We need to enable Cloud Automation to upgrade from 3.7.5 to 4.0.0 without needing to re-run setFCV.&#160; We don&apos;t need to guarantee that applications written against 3.7.5 can upgrade to 4.0.0 without a code change - that is, we&apos;re still allowed to change our public APIs up until at least RC0 (and probably could for GA if it was important enough).&lt;/p&gt;</comment>
                            <comment id="1884595" author="jmikola@gmail.com" created="Mon, 7 May 2018 14:57:43 +0000"  >&lt;blockquote&gt;&lt;p&gt;I&apos;m not sure if this is too late - it&apos;d certainly take some additional server effort to change the parser, and we&apos;d likely have to support both formats because we want to support upgrade from 3.7.5 to 4.0.0 (I&apos;ve been told). My hunch is yes unless you feel strongly about this.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This just stood out as a minor API inconsistency worth addressing while we still can. I understand if there are insufficient resources to address this for the 4.0 release.&lt;/p&gt;

&lt;p&gt;I&apos;m not sure how this relates to supporting an upgrade path from 3.7.5 to 4.0.0, since we don&apos;t document the &lt;tt&gt;$changeStream&lt;/tt&gt; operator or expect users to run it directly in their own aggregation pipelines &amp;#8211; unless you referring to beta drivers that have already implemented a &lt;tt&gt;watch()&lt;/tt&gt; helper (or perhaps ensuring the 3.7.5 shell can be used against a 4.0.0 server).&lt;/p&gt;</comment>
                            <comment id="1883412" author="misha.tyulenev" created="Fri, 4 May 2018 18:59:34 +0000"  >&lt;p&gt;As long as this value will not cause &#160;the clusterTime to advance validation is not needed. In the case of afterClusterTime the validation is needed because otherwise it will hang waiting for read concern if the value is chosen far in the future.&lt;/p&gt;</comment>
                            <comment id="1883407" author="charlie.swanson" created="Fri, 4 May 2018 18:57:00 +0000"  >&lt;p&gt;Oh, also - &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jmikola&quot; class=&quot;user-hover&quot; rel=&quot;jmikola&quot;&gt;jmikola&lt;/a&gt;&apos;s guess of where this time will come from seems good to me, though &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt; might know more - I seem to recall some customers were asking for this, independent of our need for it for resuming a stream which hasn&apos;t seen anything.&lt;/p&gt;</comment>
                            <comment id="1883405" author="charlie.swanson" created="Fri, 4 May 2018 18:56:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jmikola&quot; class=&quot;user-hover&quot; rel=&quot;jmikola&quot;&gt;jmikola&lt;/a&gt; I&apos;m not sure if this is too late - it&apos;d certainly take some additional server effort to change the parser, and we&apos;d likely have to support both formats because we want to support upgrade from 3.7.5 to 4.0.0 (I&apos;ve been told). My hunch is yes unless you feel strongly about this.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; why should we validate that? We chose not to, since the only thing that would happen is that your stream would get no notifications. We don&apos;t use this value to modify the system&apos;s clock at all. We thought about adding an assert though.&lt;/p&gt;</comment>
                            <comment id="1883234" author="misha.tyulenev" created="Fri, 4 May 2018 17:21:18 +0000"  >&lt;p&gt;Note that the server should validate that the user provided time is not greater than the clusterTime.&lt;/p&gt;</comment>
                            <comment id="1883213" author="jmikola@gmail.com" created="Fri, 4 May 2018 17:10:42 +0000"  >&lt;blockquote&gt;&lt;p&gt;To Jeremy&apos;s point, the &quot;ts&quot; field is absolutely superfluous, but we decided to use an object before because we weren&apos;t sure if a Timestamp would always be sufficient as a way of representing a cluster time (that project was in-flight at the time of the original &apos;$_resumeWithClusterTime&apos; option which we renamed here to &apos;startAtClusterTime&apos;).&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Given what we now know, is there any reason to keep the &quot;ts&quot; field in 4.0 or does this fall under &quot;too late to change it now&quot;? Looking at the current implementation of &lt;a href=&quot;https://github.com/mongodb/specifications/pull/311&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb/specifications#311&lt;/a&gt; for SPEC-1057, the drivers will accept a BSON timestamp as an option. I suppose drivers can simply wrap the BSON timestamp (be it from the session or a user-provided value) in a &quot;ts&quot; field, but I do think it&apos;d be preferable to clean up the &lt;tt&gt;$changeStream&lt;/tt&gt; API if possible.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;Finally, One point in response to Jeremy&apos;s concern is that we might expect a user to provide a timestamp gathered from the oplog (e.g. maybe they use &apos;the oldest thing in the oplog&apos; or &apos;the time from the operation right before I created that collection&apos;).&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This leads me to believe that any user-supplied value would come from one of three places: &lt;tt&gt;Session.getOperationTime()&lt;/tt&gt;, an op log document (if users are iterating manually), or be a manually constructed BSON timestamp (likely a timestamp integer with an increment of zero). We can rule out &lt;tt&gt;Session.getClusterTime()&lt;/tt&gt; because we tell users those are opaque documents and they generally shouldn&apos;t extract its &quot;clusterTime&quot; field on their own.&lt;/p&gt;
</comment>
                            <comment id="1882373" author="charlie.swanson" created="Thu, 3 May 2018 21:30:34 +0000"  >&lt;p&gt;Hello all! I hope I can provide some clarification here. It&apos;s my understanding that an &apos;operationTime&apos; is one particular cluster time. That is, out of all the values of Timestamps that have been used as a &quot;cluster time&quot; (returned with $clusterTime), an operationTime has to be one of them. I would have proposed &apos;startAtTime&apos; for the name of this option, but I wanted to make it clear that it was not an ISODate or something like that. &apos;startAtOperationTime&apos; seems fine, but logically you should be able to start at any of the cluster times, so &apos;startAtClusterTime&apos; seemed broader to me.&lt;/p&gt;

&lt;p&gt;I think that using either the &apos;operationTime&apos; or the &apos;clusterTime&apos; for this is fine from a correctness point of view, so if Misha has objections to looking within the &apos;$clusterTime&apos; field then using operationTime is good.&lt;/p&gt;

&lt;p&gt;To Jeremy&apos;s point, the &quot;ts&quot; field is absolutely superfluous, but we decided to use an object before because we weren&apos;t sure if a Timestamp would always be sufficient as a way of representing a cluster time (that project was in-flight at the time of the original &apos;$_resumeWithClusterTime&apos; option which we renamed here to &apos;startAtClusterTime&apos;).&lt;/p&gt;

&lt;p&gt;To Jeff&apos;s question, the semantics are to include any operations that happened exactly at the provided time. If I recall the decision making processes, it didn&apos;t seem to matter much so we went with &apos;include it&apos;. &lt;/p&gt;

&lt;p&gt;Finally, One point in response to Jeremy&apos;s concern is that we might expect a user to provide a timestamp gathered from the oplog (e.g. maybe they use &apos;the oldest thing in the oplog&apos; or &apos;the time from the operation right before I created that collection&apos;).&lt;/p&gt;

&lt;p&gt;Let me know if I missed anything.&lt;/p&gt;</comment>
                            <comment id="1882010" author="misha.tyulenev" created="Thu, 3 May 2018 17:42:50 +0000"  >&lt;blockquote&gt;&lt;p&gt;the server would then expect to access the &quot;clusterTime&quot; property of this opaque document and disregard any &quot;signature&quot; field (just as &lt;tt&gt;advanceClusterTime()&lt;/tt&gt; does)&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Just to clarify: the purpose of the signature is to validate that the clusterTime is in fact generated by the server to prevent malicious attacks where server&apos;s oplog optime is driven to the max and then server cant take any writes. Hence its not ignored but can be bypassed in some cases for performance.&lt;/p&gt;</comment>
                            <comment id="1881927" author="jmikola@gmail.com" created="Thu, 3 May 2018 17:06:09 +0000"  >&lt;blockquote&gt;
&lt;p&gt;I think what the startAtClusterTime field should accept is an operationTime:&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;
		&lt;tbody &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-top: 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;coll.aggregate([{&apos;$changeStream&apos;: {&apos;startAtClusterTime&apos;: {&apos;ts&apos;: session.operation_time}}}])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/blockquote&gt;

&lt;p&gt;I&apos;d argue that the &quot;ts&quot; field is superfluous. As a user-facing API, it makes sense that the &lt;tt&gt;$changeStream&lt;/tt&gt; option should take one of the following two types:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;An opaque cluster time document (&quot;blackbox&quot; per Misha&apos;s last comment), which is accessible as the &lt;tt&gt;clusterTime&lt;/tt&gt; property of a session and also accepted by the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/sessions/driver-sessions.rst#clientsession&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;Session::advanceClustertime()&lt;/tt&gt;&lt;/a&gt; method. In this case, the server would then expect to access the &quot;clusterTime&quot; property of this opaque document and disregard any &quot;signature&quot; field (just as &lt;tt&gt;advanceClusterTime()&lt;/tt&gt; does).&lt;/li&gt;
	&lt;li&gt;An operation time BSON timestamp, which is accessible as the &lt;tt&gt;operationTime&lt;/tt&gt; property of a session and also accepted by the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/causal-consistency/causal-consistency.rst#clientsession-changes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;Session::advanceOperationTime()&lt;/tt&gt;&lt;/a&gt; method.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This all depends on how we expect users to provide this value. If we expect users to craft their own BSON timestamps or supply one from &lt;tt&gt;Session.operationTime&lt;/tt&gt;, accepting a BSON timestamp type directly make sense. If we only expect users to feed in values from a Session&apos;s &lt;tt&gt;clusterTime&lt;/tt&gt; property, than the opaque cluster time document makes sense.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;I&apos;d also like clarification on the semantics of this field. Is it similar to resumeAfter in that it includes only changes that occurred after the given timestamp? If so, use the word after in the field name rather than at, as at implies that it includes changes that occurred at a time equal to the given timestamp.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;I concur. When a few of us talked this through yesterday I understood that &lt;tt&gt;startAtClusterTime&lt;/tt&gt; was basically a stand-in for a resume token when a change stream has not yet seen any change documents (and thus hasn&apos;t yet captured a resume token). I think &quot;after&quot; makes more sense in that context.&lt;/p&gt;</comment>
                            <comment id="1881880" author="misha.tyulenev" created="Thu, 3 May 2018 16:21:52 +0000"  >&lt;p&gt;I stick to my suggestion that drivers should treat $clusterTime as a blackbox object and only pass it so we will have more flexibility to make server changes without backwards compatibility dependencies. I think&#160;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt;&#160;can address&#160;change stream semantics. My take on all the afterClusterTime field variants (startAtClusterTime, atClusterTime etc) - use operationTime derived values as it was added to indicate when the last command has been performed so in the case of afterClusterTime the secondary or primary on other shard wait only as long as needed.&#160;&lt;/p&gt;</comment>
                            <comment id="1881255" author="jeff.yemin" created="Thu, 3 May 2018 01:28:05 +0000"  >&lt;p&gt;I&apos;d also like clarification on the semantics of this field.  Is it similar to &lt;tt&gt;resumeAfter&lt;/tt&gt; in that it includes only changes that occurred &lt;em&gt;after&lt;/em&gt; the given timestamp?  If so, use the word &lt;tt&gt;after&lt;/tt&gt; in the field name rather than &lt;tt&gt;at&lt;/tt&gt;, as &lt;tt&gt;at&lt;/tt&gt; implies that it includes changes that occurred at a time equal to the given timestamp.&lt;/p&gt;</comment>
                            <comment id="1881221" author="shane.harvey" created="Thu, 3 May 2018 00:05:29 +0000"  >&lt;p&gt;Copying my suggestions from SPEC-1057.&lt;/p&gt;

&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31916&quot; title=&quot;Initial request to a shardsvr mongod can return a clustertime signed with the null key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31916&quot;&gt;&lt;del&gt;SERVER-31916&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; said that he &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31916?focusedCommentId=1745844&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-1745844&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;does not want drivers peeking inside the contents of the $clusterTime document&lt;/a&gt;. Has that changed?&lt;/p&gt;

&lt;p&gt;I think what the &lt;tt&gt;startAtClusterTime&lt;/tt&gt; field should accept is an &lt;tt&gt;operationTime&lt;/tt&gt;:&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;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;&amp;gt;&amp;gt;&amp;gt; coll.aggregate([{&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$changeStream&apos;&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;startAtClusterTime&apos;&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;ts&apos;&lt;/span&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;: session.operation_time}}}])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;&amp;lt;pymongo.command_cursor.CommandCursor &lt;/span&gt;&lt;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;object&lt;/span&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; at &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0x1035e1310&lt;/span&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;&amp;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;

&lt;p&gt;Instead of a &lt;tt&gt;$clusterTime&lt;/tt&gt;:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt;&amp;gt;&amp;gt; coll.aggregate([{&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$changeStream&apos;&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;startAtClusterTime&apos;&lt;/span&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;: session.cluster_time}}])&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;Traceback (most recent call last):&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;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;File&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;&amp;lt;stdin&amp;gt;&quot;&lt;/span&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;, line &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;in&lt;/span&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; &amp;lt;module&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;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;File&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;/Users/shane/Library/Python/2.7/lib/python/site-packages/pymongo/collection.py&quot;&lt;/span&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;, line &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2181&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;in&lt;/span&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; aggregate&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;*&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;*&lt;/span&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;kwargs)&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;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;File&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;/Users/shane/Library/Python/2.7/lib/python/site-packages/pymongo/collection.py&quot;&lt;/span&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;, line &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2088&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;in&lt;/span&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; _aggregate&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;    client&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;=&lt;/span&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;self&lt;/span&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;.__database.client)&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;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;File&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;/Users/shane/Library/Python/2.7/lib/python/site-packages/pymongo/pool.py&quot;&lt;/span&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;, line &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;496&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;in&lt;/span&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; command&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;    collation&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;=&lt;/span&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;collation)&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;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;File&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;/Users/shane/Library/Python/2.7/lib/python/site-packages/pymongo/network.py&quot;&lt;/span&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;, line &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;125&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;in&lt;/span&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; command&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;    parse_write_concern_error&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;=&lt;/span&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;parse_write_concern_error)&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;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;File&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;/Users/shane/Library/Python/2.7/lib/python/site-packages/pymongo/helpers.py&quot;&lt;/span&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;, line &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;146&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;in&lt;/span&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; _check_command_response&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;raise&lt;/span&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; OperationFailure(msg &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;%&lt;/span&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; errmsg, code, response)&lt;/span&gt;&lt;/pre&gt;
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					&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;pymongo.errors.OperationFailure: BSON field &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$changeStream.startAtClusterTime.clusterTime&apos;&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;is&lt;/span&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; an unknown field.&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I propose we rename the field to &lt;tt&gt;startAtOperationTime&lt;/tt&gt; since it does not accept a cluster time. I think this makes sense because the operationTime field is already documented as corresponding to the timestamp of an oplog entry: &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.runCommand/#command-response&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/method/db.runCommand/#command-response&lt;/a&gt;&lt;/p&gt;
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