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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-31916] Initial request to a shardsvr mongod can return a clustertime signed with the null key</title>
                <link>https://jira.mongodb.org/browse/SERVER-31916</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When interacting with a mongod in a sharded cluster, the first time a client connects directly to a mongod (instead of via mongos) it can receive a null signed clustertime.  Ordinarily, this will only happen when the client has the special authorized to advance clock privilege, but it can also happen the first time an unprivileged client communicates (if that&apos;s before keys have been synced).&lt;/p&gt;

&lt;p&gt;When that client later attempts to gossip the time, they can receive a&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;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;Cache Reader No keys found for HMAC that is valid for time: { ts: Timestamp 1510338396000|21 } with id: 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;style error.  This will only occur when the cluster itself has auth enabled (as otherwise no validation is necessary).&lt;/p&gt;

&lt;p&gt;For current tests, that involves blacklisting:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;jstests/sharding/aggregation_currentop.js&lt;/li&gt;
	&lt;li&gt;jstests/sharding/auth_slaveok_routing.js&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;and forcing jstests/libs/override_methods/validate_collections_on_shutdown.js to abort if it sees KeyNotFound.&lt;/p&gt;

&lt;p&gt;We should come up with a strategy to handle this and remove the blacklist&lt;/p&gt;</description>
                <environment></environment>
        <key id="457296">SERVER-31916</key>
            <summary>Initial request to a shardsvr mongod can return a clustertime signed with the null key</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="13201">Fixed</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                            <label>todo_in_code</label>
                    </labels>
                <created>Fri, 10 Nov 2017 21:03:52 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:37 +0000</updated>
                            <resolved>Fri, 15 Dec 2017 20:56:57 +0000</resolved>
                                    <version>3.6.0-rc4</version>
                                    <fixVersion>3.7.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1753437" author="xgen-internal-githook" created="Fri, 15 Dec 2017 20:55:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Misha Tyulenev&apos;, &apos;email&apos;: &apos;misha@mongodb.com&apos;, &apos;username&apos;: &apos;mikety&apos;}
&lt;p&gt;Message: &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; wait for clusterTime on mongo connection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/36874a480ea4e2be33af298777a8d6824b7b974e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/36874a480ea4e2be33af298777a8d6824b7b974e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1751324" author="misha.tyulenev" created="Wed, 13 Dec 2017 20:56:31 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=behackett&quot; class=&quot;user-hover&quot; rel=&quot;behackett&quot;&gt;behackett&lt;/a&gt; the specific check will introduce the dependency on the $clusterTime format. and it may affect our ability to  change this field in the future releases. So I suggest to not assume a specific $clusterTime structure if there is a forward compatibility requirement.&lt;/p&gt;</comment>
                            <comment id="1745930" author="behackett" created="Thu, 7 Dec 2017 20:19:55 +0000"  >&lt;p&gt;Could we make &quot;$clusterTime.signature.keyId === 0&quot; a valid check that drivers can do, or provide some other way for a driver to know that it shouldn&apos;t gossip a particular $clusterTime value? &lt;/p&gt;</comment>
                            <comment id="1745844" author="misha.tyulenev" created="Thu, 7 Dec 2017 19:19:36 +0000"  >&lt;p&gt;Its a valid state for a mongod to be available but return dummy signature. While dummy signatures are easy to recognize, as the $clusterTime.signature.keyId === 0  I don&apos;t advise on drivers making any assumptions about $clusterTime format &lt;br/&gt;
The server guarantee is signing all the errors with the $clusterTime that uses the correct keys insignature (it server have them), so the driver suppose to recover by retrying the command on the same connection.&lt;/p&gt;

&lt;p&gt;There is a way to make it more reliable by adding a refresh to the time signing code on mongod but this may cause slight performance degradation, so let me know how important this is.&lt;/p&gt;

&lt;p&gt;Still the scenarios where mongod is unable to respond due to validation errors is possible but less likely&lt;/p&gt;</comment>
                            <comment id="1745760" author="behackett" created="Thu, 7 Dec 2017 18:33:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeff.yemin&quot; class=&quot;user-hover&quot; rel=&quot;jeff.yemin&quot;&gt;jeff.yemin&lt;/a&gt; has a theory that this will cause problems for drivers in general.&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;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;Couldn&apos;t you get in to a bad situation even if we fix the python bug?&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;for instance:&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;monitor thread calls isMaster&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;receives response with bad cluster time and stores in the global clock&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;before the next monitor thread call, the application initiates a command, which will include the bad 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;I&apos;m assuming that the isMaster response with the bad cluster time was &quot;successful&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;   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;and causes SDAM state machine to make the server available&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;Granted, this assumes you are connecting directly to a shard on purpose.&lt;/p&gt;</comment>
                            <comment id="1745724" author="misha.tyulenev" created="Thu, 7 Dec 2017 18:14:41 +0000"  >&lt;p&gt;This is a self-fixing issue because the error returns the correct signature. This change patches the shell to wait for the valid signature in the ping response.&lt;/p&gt;</comment>
                            <comment id="1745600" author="schwerin" created="Thu, 7 Dec 2017 17:12:19 +0000"  >&lt;p&gt;I believe the plan is to work around the behavior in the shell. Avoiding the race condition that causes it in the server is difficult, and the behavior should only affect newly started servers and new clusters. &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;, can you confirm?&lt;/p&gt;</comment>
                            <comment id="1724684" author="misha.tyulenev" created="Mon, 13 Nov 2017 22:59:33 +0000"  >&lt;p&gt;It does not seem to be a blocker because:&lt;br/&gt;
1) it may not happen to connections to mongos (mongos always waits for keys)&lt;br/&gt;
2) in replicasets its possible if timing is unfortunate (only the beginning of the RS start when keys not generated yet) but its self correcting as the error suppose to return the valid $clusterTime so the follow up retries will work&lt;br/&gt;
Once fixed it must be backported to 3.6&lt;/p&gt;</comment>
                            <comment id="1723998" author="ian@10gen.com" created="Mon, 13 Nov 2017 15:22:44 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt; since this is 3.6 Required I&apos;m assigning to Platforms to make sure it doesn&apos;t get lost.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="504275">SERVER-33585</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="935635">SERVER-43516</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="468848">PYTHON-1434</issuekey>
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