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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-61182] [inMemory] collmod_convert_to_unique.js fails under in-memory storage engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-61182</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This test was introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61158&quot; title=&quot;Convert a non-unique index to a unique index via the collMod command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61158&quot;&gt;&lt;del&gt;SERVER-61158&lt;/del&gt;&lt;/a&gt; to support collMod enhancements for indexes. The index spec is updated successfully in the index catalog but the WiredTiger storage engine fails on an invariant because the metadata changes, made with the the &lt;a href=&quot;http://source.wiredtiger.com/10.0.0/struct_w_t___s_e_s_s_i_o_n.html#ac6f0630cb70bb057aa4512f7888dc701&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WT_SESSION::alter()&lt;/a&gt; function,  did not go through as expected. We hit an invariant as we refresh the index using the WiredTigerUniqueIndex class.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1915300">SERVER-61182</key>
            <summary>[inMemory] collmod_convert_to_unique.js fails under in-memory storage engine</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-storage-engines">Backlog - Storage Engines Team</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                            <label>refinement</label>
                    </labels>
                <created>Tue, 2 Nov 2021 10:57:45 +0000</created>
                <updated>Wed, 10 Jan 2024 20:20:55 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5917416" author="alexander.gorrod" created="Fri, 1 Dec 2023 02:42:40 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yuhong.zhang%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;yuhong.zhang@mongodb.com&quot;&gt;yuhong.zhang@mongodb.com&lt;/a&gt;. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=steve.kuhn%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;steve.kuhn@mongodb.com&quot;&gt;steve.kuhn@mongodb.com&lt;/a&gt; could you please create a project titled &quot;Altering table metadata without exclusive access in WiredTiger&quot; (or similar), so we can get more specific about how much work would be involved on the WiredTiger side to support it, and find a way to get it scheduled.&lt;/p&gt;</comment>
                            <comment id="5886314" author="JIRAUSER1253424" created="Thu, 16 Nov 2023 19:41:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alexander.gorrod%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;alexander.gorrod@mongodb.com&quot;&gt;alexander.gorrod@mongodb.com&lt;/a&gt; alter is used by collMod which is a replicated command used to modify collection metadata. This can cause a problem when we have a replica set with a mix of nodes running in-memory and on-disk storage engine. Currently there is really not a good solution to this problem so we would like to check again if it&apos;s possible to fix alter for in-memory engine.&lt;/p&gt;</comment>
                            <comment id="5803682" author="alexander.gorrod" created="Wed, 25 Oct 2023 00:22:18 +0000"  >&lt;p&gt;This is not simple to fix. The &lt;tt&gt;alter&lt;/tt&gt; operation requires exclusive access to a data handle, which generally involves closing the handle and flushing associated content from the cache. It is not possible to do that when running with an in-memory only configuration, as the cache is the only place where the data exists.&lt;/p&gt;

&lt;p&gt;It should (on some level) be safe for the alter to proceed without needing exclusive access, since it does not need to be concerned about the durability of the change (there is no durability). It&apos;s quite a lot of work to add a different concurrency control mechanism to handle &lt;tt&gt;alter&lt;/tt&gt; commands, and given that this has remained as-is for a fair while without user-complaint, I&apos;m inclined to close it out. The engineering effort required isn&apos;t justified given the minimal end-user consequence.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=benety.goh%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;benety.goh@mongodb.com&quot;&gt;benety.goh@mongodb.com&lt;/a&gt; please re-open with additional context if this is the wrong decision.&lt;/p&gt;</comment>
                            <comment id="4243596" author="JIRAUSER1258229" created="Mon, 13 Dec 2021 13:31:37 +0000"  >&lt;p&gt;Error when running the repo:&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;[js_test:collmod_convert_to_unique] [jsTest] ----&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;[js_test:collmod_convert_to_unique] [jsTest] Duplicate key error from failed conversion: {&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;[js_test:collmod_convert_to_unique] [jsTest] 	&quot;ok&quot; : 0,&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;[js_test:collmod_convert_to_unique] [jsTest] 	&quot;errmsg&quot; : &quot;Failed to convert index to unique. firstRecordId: RecordId(1); firstDoc: { _id: 1.0, a: 100.0 }; secondRecordIdRecordId(2); secondDoc: { _id: 2.0, a: 100.0 }; collectionUUID: decc0ccf-78aa-426b-87ad-5037dabc61a8 :: caused by :: E11000 duplicate key error collection: test.collmod_convert_to_unique index: a_1 dup key: { a: 100.0 }&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;&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;[js_test:collmod_convert_to_unique] [jsTest] 	&quot;code&quot; : 11000,&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;[js_test:collmod_convert_to_unique] [jsTest] 	&quot;codeName&quot; : &quot;DuplicateKey&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;&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;[js_test:collmod_convert_to_unique] [jsTest] 	&quot;keyPattern&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;&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;[js_test:collmod_convert_to_unique] [jsTest] 		&quot;a&quot; : 1&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;[js_test:collmod_convert_to_unique] [jsTest] 	},&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;[js_test:collmod_convert_to_unique] [jsTest] 	&quot;keyValue&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;&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;[js_test:collmod_convert_to_unique] [jsTest] 		&quot;a&quot; : 100&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;[js_test:collmod_convert_to_unique] [jsTest] 	}&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;[js_test:collmod_convert_to_unique] [jsTest] }&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;[js_test:collmod_convert_to_unique] [jsTest] ---- &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 dug into the code and I found this ticket&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-3310&quot; title=&quot;Add support to WT_SESSION::alter to change table log setting&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3310&quot;&gt;&lt;del&gt;WT-3310&lt;/del&gt;&lt;/a&gt; that introduces &lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/pull/3439/files#diff-83dc7369b5ee8450ef01eacbe2623e48983d9e78106e6a0466857a04bb506ff2R152-R155&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the following changes&lt;/a&gt;&#160;where an alter command is ignored in the in-memory configuration. &lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/pull/3439/files#r125207075&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This comment&lt;/a&gt; from &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=agorrod&quot; class=&quot;user-hover&quot; rel=&quot;agorrod&quot;&gt;agorrod&lt;/a&gt; suspected this code might need to be changed at some point.&lt;/p&gt;

&lt;p&gt;I removed those few lines from the code and the test runs successfully:&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;     /* In-memory ignores alter operations. */&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-    if (F_ISSET(S2C(session), WT_CONN_IN_MEMORY))&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;-        goto err;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+    // if (F_ISSET(S2C(session), WT_CONN_IN_MEMORY))&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;+    //    goto err; &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 was a very quick investigation, we probably need to assess the impact(s) of allowing the alter command to be executed when WT is configured to be in memory.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4211183" author="JIRAUSER1254368" created="Thu, 25 Nov 2021 00:18:51 +0000"  >&lt;p&gt;Scope: Investigate and create a WT ticket if there is a fix required at the WT end.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2482531">SERVER-82431</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2501353">SERVER-83314</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1914338">SERVER-61158</issuekey>
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