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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-21943] MR crashes in a sharded WT environment</title>
                <link>https://jira.mongodb.org/browse/SERVER-21943</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We got the a similar error to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16429&quot; title=&quot;Concurrent mapReduces with same replacement collection fail with WT&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16429&quot;&gt;&lt;del&gt;SERVER-16429&lt;/del&gt;&lt;/a&gt; at version 3.0.4.&lt;br/&gt;
It happens once a week in a sharded environment with WT engine in the mongod instances.&lt;br/&gt;
The evidences is a crashed shard, while in the other shard there a remaining of a tmp table that was not deleted.&lt;br/&gt;
Attached is the log error from the failed shard:&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;2015-12-12T00:35:40.814+0000 I COMMAND  [conn92487] mr failed, removing collection :: caused by :: 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;2015-12-12T00:35:40.818+0000 I COMMAND  [conn92487] CMD: drop XXXX.tmp.mr.account_231015&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;2015-12-12T00:35:40.822+0000 I NETWORK  [initandlisten] connection accepted from XXX.XXX.XXX.XXX:XXXXX #110728 (47 connections now open)&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;2015-12-12T00:35:40.920+0000 I COMMAND  [conn92487] command XXXX.$cmd command: drop { drop: &quot;tmp.mr.account_231015&quot; } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:122 locks:{ Global: { acquireCount: { r: 8, w: 4 } }, Database: { acquireCount: { r: 1, w: 1, R: 1, W: 4 }, acquireWaitCount: { W: 4 }, timeAcquiringMicros: { W: 7627049380 } }, Collection: { acquireCount: { r: 1, w: 1, W: 1 } } } 102ms&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;2015-12-12T00:35:40.920+0000 I QUERY    [conn110694] query XXXX.endpoints query: { $query: { gw: { $gt: 0 }, $or: [ { status: &quot;unmanaged&quot; }, { status: &quot;managed&quot; } ] }, $readPreference: { mode: &quot;secondaryPreferred&quot; } } planSummary: IXSCAN { gw: -1.0, status: -1.0 } ntoreturn:0 ntoskip:0 nscanned:0 nscannedObjects:0 keyUpdates:0 writeConflicts:0 numYields:1 nreturned:0 reslen:20 locks:{ Global: { acquireCount: { r: 4 } }, Database: { acquireCount: { r: 2 }, acquireWaitCount: { r: 2 }, timeAcquiringMicros: { r: 3690878996 } }, Collection: { acquireCount: { r: 2 } } } 106ms&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;2015-12-12T00:35:40.920+0000 I QUERY    [conn110692] query XXXX.endpoints query: { $query: { gw: { $gt: 0 }, $or: [ { status: &quot;unmanaged&quot; }, { status: &quot;managed&quot; } ] }, $readPreference: { mode: &quot;secondaryPreferred&quot; } } planSummary: IXSCAN { gw: -1.0, status: -1.0 } ntoreturn:0 ntoskip:0 nscanned:0 nscannedObjects:0 keyUpdates:0 writeConflicts:0 numYields:3 nreturned:0 reslen:20 locks:{ Global: { acquireCount: { r: 8 } }, Database: { acquireCount: { r: 4 }, acquireWaitCount: { r: 4 }, timeAcquiringMicros: { r: 3690908386 } }, Collection: { acquireCount: { r: 4 } } } 182338ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2015-12-12T00:35:40.927+0000 I COMMAND  [conn92491] command admin.$cmd command: listDatabases { listDatabases: 1 } ntoreturn:1 keyUpdates:0 writeConflicts:0 numYields:0 reslen:290 locks:{ Global: { acquireCount: { r: 6 } }, Database: { acquireCount: { r: 3 }, acquireWaitCount: { r: 1 }, timeAcquiringMicros: { r: 14825915727 } } } 179101ms&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;2015-12-12T00:35:40.978+0000 E NETWORK  [conn92487] Uncaught std::exception: std::exception, terminating&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;2015-12-12T00:35:40.978+0000 I CONTROL  [conn92487] dbexit:  rc: 100&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="244468">SERVER-21943</key>
            <summary>MR crashes in a sharded WT environment</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="4">Incomplete</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="MosheKaplan">Moshe Kaplan [X]</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Dec 2015 13:45:31 +0000</created>
                <updated>Sat, 5 Mar 2016 15:02:43 +0000</updated>
                            <resolved>Sat, 5 Mar 2016 15:02:43 +0000</resolved>
                                    <version>3.0.4</version>
                                                    <component>MapReduce</component>
                    <component>Sharding</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1170377" author="moshekaplan" created="Thu, 11 Feb 2016 08:57:38 +0000"  >&lt;p&gt;The customer still suffers from the issue at v3.0.8&lt;br/&gt;
They will soon try to upgrade to v3.2.1 and I&apos;ll report reg. the results.&lt;/p&gt;</comment>
                            <comment id="1169730" author="ramon.fernandez" created="Wed, 10 Feb 2016 20:09:38 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=MosheKaplan&quot; class=&quot;user-hover&quot; rel=&quot;MosheKaplan&quot;&gt;MosheKaplan&lt;/a&gt;, we haven&apos;t heard back from you for a while. Are you still experiencing this issue?&lt;/p&gt;

&lt;p&gt;MongoDB 3.0 is at version 3.0.9, so if you were going to upgrade and try to reproduce the problem I&apos;d suggest you consider 3.0.9.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1124256" author="moshekaplan" created="Wed, 30 Dec 2015 21:12:21 +0000"  >&lt;p&gt;Thanks Thomas,&lt;br/&gt;
We currently try to eliminate the issue, and probably we won&apos;t have results before early Jan.&lt;br/&gt;
I&apos;ll keep update regarding our results.&lt;/p&gt;</comment>
                            <comment id="1124249" author="thomas.schubert" created="Wed, 30 Dec 2015 20:52:21 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=MosheKaplan&quot; class=&quot;user-hover&quot; rel=&quot;MosheKaplan&quot;&gt;MosheKaplan&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I am not able to point you to a specific fix - there have been numerous improvements to the WiredTiger storage engine since 3.0.4 that may affect what you are observing. If the issue persists after upgrading would you be able to upload the relevant datasets so we can attempt to reproduce this behavior on our side?&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1120258" author="moshekaplan" created="Tue, 22 Dec 2015 10:01:46 +0000"  >&lt;p&gt;Hi Thomas,&lt;br/&gt;
We may be able to do that on Thu, and it may take few more days to recreate,&lt;br/&gt;
Do you suspect any specific fix that implemented on 3.0.5 to 3.0.8 that should have solved it?&lt;br/&gt;
Moshe&lt;/p&gt;</comment>
                            <comment id="1120049" author="thomas.schubert" created="Tue, 22 Dec 2015 01:08:20 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=MosheKaplan&quot; class=&quot;user-hover&quot; rel=&quot;MosheKaplan&quot;&gt;MosheKaplan&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Can you please upgrade to 3.0.8 and confirm if the issue persists? &lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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2. Run a MR every 5 min&lt;br/&gt;
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