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<channel>
    <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-66974] Server responding with unexpected error 246 (SnapshotUnavailable)</title>
                <link>https://jira.mongodb.org/browse/SERVER-66974</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Java driver has three similar tests (for legacy, sync, and async APIs) that all occasionally fail with the server error: &lt;/p&gt;

&lt;p/&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;   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;   &quot;ok&quot;: 0.0, &lt;/span&gt;&lt;/pre&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;   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;   &quot;code&quot;: 246, &lt;/span&gt;&lt;/pre&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;   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;   &quot;codeName&quot;: &quot;SnapshotUnavailable&quot;&lt;/span&gt;&lt;/pre&gt;
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					&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;   &quot;errorLabels&quot;: [&quot;TransientTransactionError&quot;], &lt;/span&gt;&lt;/pre&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;   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;   &quot;errmsg&quot;: &quot;Unable to read from a snapshot due to pending collection catalog changes; please retry the operation. Snapshot timestamp is Timestamp(1654118095, 84). Collection minimum is Timestamp(1654118095, 86)&quot;, &lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The tests all do the following:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;drop the collection&lt;/li&gt;
	&lt;li&gt;insert a document into the collection&lt;/li&gt;
	&lt;li&gt;insert a document into the collection within a transaction&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Expected results: the insert within a transaction succeeds&lt;br/&gt;
Action results: the above error is returned by the server&lt;/p&gt;

&lt;p&gt;Questions:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;What is the root cause of that error?&lt;/li&gt;
	&lt;li&gt;Is there any way to change the test in order to stop the error from occurring?&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Linked BF ticket for Java driver: &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-4637&quot; title=&quot;failed: MongoClientSessionSpecification.should_ignore_unacknowledged_write_concern_when_in_a_transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-4637&quot;&gt;&lt;del&gt;JAVA-4637&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;


</description>
                <environment>* rhel70-small&lt;br/&gt;
* 6.0.0-rc8 server&lt;br/&gt;
* three node replica set</environment>
        <key id="2060844">SERVER-66974</key>
            <summary>Server responding with unexpected error 246 (SnapshotUnavailable)</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13202">Works as Designed</resolution>
                                        <assignee username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Jun 2022 18:28:34 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:00 +0000</updated>
                            <resolved>Fri, 3 Jun 2022 20:23:49 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4594195" author="daniel.gottlieb@10gen.com" created="Fri, 3 Jun 2022 20:23:28 +0000"  >&lt;blockquote&gt;
&lt;p&gt;Feel free to keep this ticket open if there is anything that you think could be improved on the server to improve the user experience (while unacknowledged writes are (hopefully) a rare thing in practice, there may be other situations where normal concurrent writes could encounter this error).&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Unfortunately the server behavior is unrelated to the requests write concern &amp;#8211; the ingredients to hit this state is more pervasive for real users than is being suggested. Anything that writes to the oplog creates &quot;holes&quot; which can result in SnapshotUnavailable for other clients. Even if the collection namespaces are unrelated. Enabling causal consistency is the recommended solution for anyone using transactions.&lt;/p&gt;</comment>
                            <comment id="4594150" author="jeff.yemin" created="Fri, 3 Jun 2022 20:08:01 +0000"  >&lt;p&gt;That&apos;s a great analysis, and it points me towards what the root cause is.  While I claimed that there are no concurrent tests, in reality there is a sneaky driver feature that can introduce concurrency: unacknowledged (w: 0) writes. And in fact there is another test in the same class, that uses the same collection, which does in fact execute an unacknowledged write and doesn&apos;t have a mechanism to ensure that the server actually applied that write before the end of the test.  I think I can work around that now that I understand it better.&lt;/p&gt;

&lt;p&gt;Feel free to keep this ticket open if there is anything that you think could be improved on the server to improve the user experience (while unacknowledged writes are (hopefully) a rare thing in practice, there may be other situations where normal concurrent writes could encounter this error).  &lt;/p&gt;</comment>
                            <comment id="4592792" author="daniel.gottlieb@10gen.com" created="Fri, 3 Jun 2022 13:36:24 +0000"  >&lt;blockquote&gt;
&lt;p&gt;There are no concurrent tests running.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;I can see in the logs something concurrent is happening &amp;#8211; maybe not another test. At the time of the error there are two connections logging messages. conn4629 which gives the error and conn6231 which is making this collection:&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;2022-06-01T21:14:55.986+00:00 I  STORAGE  [conn6231] createCollection {&quot;namespace&quot;:&quot;JavaDriverTest.com.mongodb.client.MongoClientSessionSpecification&quot;,&quot;uuidDisposition&quot;:&quot;generated&quot;,&quot;uuid&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;775ae530-7ff1-4d42-adb1-fc2ca98b6a7a&quot;}},&quot;options&quot;:{}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;I can see creating that collection lost the race in a write-write conflict:&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;2022-06-01T21:14:56.019+00:00 I  STORAGE  [conn6231] Conflicted registering namespace, already have a collection with the same namespace {&quot;nss&quot;:&quot;JavaDriverTest.com.mongodb.client.MongoClientSessionSpecification&quot;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;That namespace is coincidentally the same one conn4629 is performing an insert against.&lt;/p&gt;

&lt;p&gt;The SnapshotUnavailable log line you have sits between those two log lines. I hypothesize that if we had the data files for this test case we would see that &lt;tt&gt;Timestamp(1654118095, 85)&lt;/tt&gt; does not exist in the oplog. I believe the race that resulted in SnapshotUnavailable was:&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;
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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;| conn4629                                                          | conn6231                           |&lt;/span&gt;&lt;/pre&gt;
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					&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;
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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;   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;|                                                                   | BeginTxn                           |&lt;/span&gt;&lt;/pre&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;   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;|                                                                   | Allocate Timestamp(1654118095, 85) |&lt;/span&gt;&lt;/pre&gt;
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					&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;|                                                                   | CreateCollection X                 |&lt;/span&gt;&lt;/pre&gt;
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					&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;| Allocate Timestamp(1654118095, 86)                                |                                    |&lt;/span&gt;&lt;/pre&gt;
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					&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;| CreateCollection X                                                |                                    |&lt;/span&gt;&lt;/pre&gt;
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					&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;| Commit (OK)                                                       |                                    |&lt;/span&gt;&lt;/pre&gt;
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					&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;| BeginTxn :readTimestamp = all_durable = Timestamp(1654118095, 84) |                                    |&lt;/span&gt;&lt;/pre&gt;
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					&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;| Insert(X, [documents]) -&amp;gt; SnapshotUnavailable                     |                                    |&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;|                                                                   | Commit (WriteConflict)             |&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;To summarize: a concurrent writer from somewhere opened up a hole. Removing the concurrent writer would have fixed this case, but is not a robust solution (for example, the noop writer in the server can cause this problem). Using causal consistency is a robust solution. This would resolve to the following interleaving in the server:&lt;/p&gt;
&lt;p/&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;| conn4629                                               | conn6231                           |&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;|                                                        | BeginTxn                           |&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;|                                                        | Allocate Timestamp(1654118095, 85) |&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;|                                                        | CreateCollection X                 |&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;| BeginTxn                                               |                                    |&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;| Allocate Timestamp(1654118095, 86)                     |                                    |&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;| CreateCollection X                                     |                                    |&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;| Commit (OK)                                            |                                    |&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;| afterClusterTime Timestamp(1654118095, 86) -- Blocking |                                    |&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;|                                                        | Commit (WriteConflict)             |&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;| BeginTxn :readTimestamp = Timestamp(1654118095, 86)    |                                    |&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;| Insert(X, [documents])                                 |                                    |&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;| Commit (OK)                                            |                                    |&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="4591406" author="jeff.yemin" created="Thu, 2 Jun 2022 20:51:28 +0000"  >&lt;p&gt;I think this is the log message that is relevant:&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;{&quot;t&quot;:{&quot;$date&quot;:&quot;2022-06-01T21:14:56.015+00:00&quot;},&quot;s&quot;:&quot;I&quot;,  &quot;c&quot;:&quot;COMMAND&quot;,  &quot;id&quot;:51803,   &quot;ctx&quot;:&quot;conn4629&quot;,&quot;msg&quot;:&quot;Slow query&quot;,&quot;attr&quot;:{&quot;type&quot;:&quot;command&quot;,&quot;ns&quot;:&quot;JavaDriverTest.com.mongodb.client.MongoClientSessionSpecification&quot;,&quot;command&quot;:{&quot;insert&quot;:&quot;com.mongodb.client.MongoClientSessionSpecification&quot;,&quot;ordered&quot;:true,&quot;$db&quot;:&quot;JavaDriverTest&quot;,&quot;$clusterTime&quot;:{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1654118096,&quot;i&quot;:1}},&quot;signature&quot;:{&quot;hash&quot;:{&quot;$binary&quot;:{&quot;base64&quot;:&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAA=&quot;,&quot;subType&quot;:&quot;0&quot;}},&quot;keyId&quot;:0}},&quot;lsid&quot;:{&quot;id&quot;:{&quot;$uuid&quot;:&quot;e31e6e8e-c978-4651-9434-b2c69b2f3c43&quot;}},&quot;txnNumber&quot;:123,&quot;startTransaction&quot;:true,&quot;autocommit&quot;:false},&quot;ninserted&quot;:0,&quot;numYields&quot;:0,&quot;ok&quot;:0,&quot;errMsg&quot;:&quot;Unable to read from a snapshot due to pending collection catalog changes; please retry the operation. Snapshot timestamp is Timestamp(1654118095, 84). Collection minimum is Timestamp(1654118095, 86)&quot;,&quot;errName&quot;:&quot;SnapshotUnavailable&quot;,&quot;errCode&quot;:246,&quot;reslen&quot;:469,&quot;locks&quot;:{&quot;FeatureCompatibilityVersion&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:1}},&quot;ReplicationStateTransition&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:3}},&quot;Global&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:1}},&quot;Database&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:1}},&quot;Collection&quot;:{&quot;acquireCount&quot;:{&quot;w&quot;:1}},&quot;Mutex&quot;:{&quot;acquireCount&quot;:{&quot;r&quot;:1}}},&quot;flowControl&quot;:{&quot;acquireCount&quot;:1,&quot;timeAcquiringMicros&quot;:1},&quot;readConcern&quot;:{&quot;level&quot;:&quot;local&quot;,&quot;provenance&quot;:&quot;implicitDefault&quot;},&quot;storage&quot;:{},&quot;remote&quot;:&quot;127.0.0.1:49394&quot;,&quot;protocol&quot;:&quot;op_msg&quot;,&quot;durationMillis&quot;:0}}&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;It&apos;s in &lt;tt&gt;.evergreen/orchestration/db/mongod-jonfftty/mongod.log&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;The others are indeed red herrings due to our extensive use of failpoints for testing.&#160;&lt;/p&gt;</comment>
                            <comment id="4591076" author="daniel.gottlieb@10gen.com" created="Thu, 2 Jun 2022 19:18:41 +0000"  >&lt;p&gt;Re: logs, there are multiple mongod logs &amp;#8211; not sure which one is relevant. Searching for SnapshotUnavailable gives me something I&apos;m not sure how to interpret:&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;{&quot;t&quot;:{&quot;$date&quot;:&quot;2022-06-01T21:13:43.846+00:00&quot;},&quot;s&quot;:&quot;D1&quot;, &quot;c&quot;:&quot;ASSERT&quot;,   &quot;id&quot;:23074,   &quot;ctx&quot;:&quot;conn4608&quot;,&quot;msg&quot;:&quot;User assertion&quot;,&quot;attr&quot;:{&quot;error&quot;:&quot;SnapshotUnavailable: Failing command via &apos;failCommand&apos; failpoint&quot;,&quot;file&quot;:&quot;src/mongo/db/commands.cpp&quot;,&quot;line&quot;:762}}&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;I assume I&apos;m just seeing a red herring looking at the wrong logs/time period?&lt;/p&gt;</comment>
                            <comment id="4591049" author="daniel.gottlieb@10gen.com" created="Thu, 2 Jun 2022 19:11:43 +0000"  >&lt;blockquote&gt;
&lt;p&gt;What is the root cause of that error?&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Fundamentally the problem arises because we don&apos;t have perfect detail on historical information on collection state. Reading at a timestamp (read: &quot;in the past&quot;) may discover, for example, that we don&apos;t know which indexes existed at that time and were fully built/consistent. This barrier also applies to collection creation.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Is there any way to change the test in order to stop the error from occurring?&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;A quick thing to try is turning on causal consistency. Assuming that still meets the goal of whats being tested.&lt;/p&gt;

&lt;p&gt;I&apos;m assuming the operation time in the response from the &quot;create collection&quot; request matches the timestamp value in &lt;tt&gt;Collection minimum is Timestamp(...)&lt;/tt&gt;. Using causal consistency/afterClusterTime will have the server internally wait, avoiding the SnapshotUnavailable error. I&apos;m surprised this would have started recently. Which might be something worth server understanding and making sure we&apos;re behaving as expected.&lt;/p&gt;</comment>
                            <comment id="4590999" author="jeff.yemin" created="Thu, 2 Jun 2022 18:55:19 +0000"  >&lt;p&gt;Also, if you follow the links from the JAVA BF ticket, you&apos;ll find the full server logs attached to the task.&lt;/p&gt;</comment>
                            <comment id="4590957" author="jeff.yemin" created="Thu, 2 Jun 2022 18:45:46 +0000"  >&lt;p&gt;Here are (roughly) the raw commands (obtained from driver logs):&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;{&quot;drop&quot;: &quot;snapshot-test&quot;, &quot;$db&quot;: &quot;test&quot;, &quot;lsid&quot;: {&quot;id&quot;: {&quot;$binary&quot;: {&quot;base64&quot;: &quot;OwX48zMHTwGA26ve43Jfag==&quot;, &quot;subType&quot;: &quot;04&quot;}}}}&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;{&quot;insert&quot;: &quot;snapshot-test&quot;, &quot;ordered&quot;: true, &quot;$db&quot;: &quot;test&quot;, &quot;lsid&quot;: {&quot;id&quot;: {&quot;$binary&quot;: {&quot;base64&quot;: &quot;OwX48zMHTwGA26ve43Jfag==&quot;, &quot;subType&quot;: &quot;04&quot;}}}, &quot;documents&quot;: [{&quot;_id&quot;: {&quot;$oid&quot;: &quot;6299048f064a9411875f4f43&quot;}}]}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;insert&quot;: &quot;snapshot-test&quot;, &quot;ordered&quot;: true, &quot;$db&quot;: &quot;test&quot;, &quot;lsid&quot;: {&quot;id&quot;: {&quot;$binary&quot;: {&quot;base64&quot;: &quot;OwX48zMHTwGA26ve43Jfag==&quot;, &quot;subType&quot;: &quot;04&quot;}}}, &quot;txnNumber&quot;: 1, &quot;startTransaction&quot;: true, &quot;autocommit&quot;: false, &quot;documents&quot;: [{&quot;_id&quot;: {&quot;$oid&quot;: &quot;6299048f064a9411875f4f44&quot;}}]}&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;There are no concurrent tests running.&lt;/p&gt;</comment>
                            <comment id="4590930" author="daniel.gottlieb@10gen.com" created="Thu, 2 Jun 2022 18:38:10 +0000"  >&lt;p&gt;Hey Jeff, mind adding details around using causal consistency and/or any write concern/read concerns send along with each of the requests? Though I think RC is not technically relevant.&lt;/p&gt;

&lt;p&gt;Also can you confirm if there are other concurrent test threads performing writes against the mongod?&lt;/p&gt;</comment>
                    </comments>
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