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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>
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<item>
            <title>[SERVER-14213] Config Server Corruption - BSONObj size: 1852404841 (0x6974696E) is invalid. Size must be between 0 and 16793600(16MB)</title>
                <link>https://jira.mongodb.org/browse/SERVER-14213</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi MongoDB,&lt;/p&gt;

&lt;p&gt;I&apos;m running a sharded cluster with:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;3 MongoS instances (version 2.4.5)&lt;/li&gt;
	&lt;li&gt;9 MongoD (3 data nodes per shard, a primary, secondary and arbiter, all are version 2.4.5)&lt;/li&gt;
	&lt;li&gt;3 Config Servers (version 2.4.5)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;When I attempt to shard a new collection on an existing DB I get the following:&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;sh.shardCollection(&quot;Customer.CustomerEventVisits&quot;,{a:1,b:1},true)&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;        &quot;code&quot; : 8017,&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;        &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;        &quot;errmsg&quot; : &quot;exception: update not consistent  ns: config.chunks query: { _id: \&quot;Customer.CustomerEventVisits-a_MinKeyb_MinKey\&quot; } update: { _id: \&quot;Customer.CustomerEventVisits-a_MinKeyb_MinKey\&quot;, lastmod: Timestamp 1000|0, lastmodEpoch: ObjectId(&apos;5395c5793d5ce34d5ccd6823&apos;), ns: \&quot;Customer.CustomerEventVisits\&quot;, min: { a: MinKey, b: MinKey }, max: { a: MaxKey, b: MaxKey }, shard: \&quot;j1shard\&quot; } gle1: { updatedExisting: false, n: 1, lastOp: Timestamp 1402324345000|3, connectionId: 2032481, waited: 27, err: null, ok: 1.0 } gle2: { err: \&quot;BSONObj size: 1852404841 (0x6974696E) is invalid. Size must be between 0 and 16793600(16MB) First element: : ?type=103\&quot;, code: 10334, n: 0, connectionId: 2031264, waited: 10, ok: 1.0 &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;   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;}&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&apos;m also seeing the following logged on each config server:&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;Mon Jun  9 13:09:03.238 [LockPinger] warning: distributed lock pinger &apos;bomongodbc1n1:30003,bomongodbc1n2:30003,bomongodbc1n3:30003/bomongos02.csnzoo.com:30004:1396381269:1804289383&apos; detected an exception while pinging. :: caused by :: update not consistent  ns: config.lockpings query: { _id: &quot;bomongos02.csnzoo.com:30004:1396381269:1804289383&quot; } update: { $set: { ping: new Date(1402333743122) } } gle1: { updatedExisting: true, n: 1, lastOp: Timestamp 1402333743000|2, connectionId: 2035785, waited: 36, err: null, ok: 1.0 } gle2: { err: &quot;BSONObj size: 1852404841 (0x6974696E) is invalid. Size must be between 0 and 16793600(16MB) First element: : ?type=103&quot;, code: 10334, n: 0, connectionId: 2034560, waited: 4, ok: 1.0 }&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;as well as entries like:&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;Jun  9 13:24:42 bomongodbc1n3 mongod.30003[32118]: Mon Jun  9 13:24:42.223 [conn2034890] update config.mongos query: { _id: &quot;bomongos01.csnzoo.com:30004&quot; } update: { $set: { ping: new Date(1402334682197), up: 5953440, waiting: true, mongoVersion: &quot;2.4.5&quot; } } idhack:1 fastmod:1 keyUpdates:0 exception: BSONObj size: 1852404841 (0x6974696E) is invalid. Size must be between 0 and 16793600(16MB) First element: : ?type=103 code:10334 locks(micros) w:25423 12ms&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 believe my config server collections (lockpings and mongos) have bad data in them... in fact when I look at the documents in each there are old mongos entries that don&apos;t exist and there inconsistent lock times or entries that are valid when comparing across the 3 config servers&lt;/p&gt;

&lt;p&gt;Any idea on how to resolve this? &lt;/p&gt;

&lt;p&gt;It&apos;s a production instance so I&apos;m hesitant to make a change and it doesn&apos;t sound like my config backups will help since this has been going on past the retention threshold I have...&lt;/p&gt;

&lt;p&gt;Thanks so much!&lt;br/&gt;
Mike&lt;/p&gt;</description>
                <environment></environment>
        <key id="141136">SERVER-14213</key>
            <summary>Config Server Corruption - BSONObj size: 1852404841 (0x6974696E) is invalid. Size must be between 0 and 16793600(16MB)</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="amarettoslim">Mike</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Jun 2014 17:29:19 +0000</created>
                <updated>Wed, 10 Dec 2014 23:12:04 +0000</updated>
                            <resolved>Mon, 9 Jun 2014 22:34:54 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="614671" author="ramon.fernandez" created="Mon, 9 Jun 2014 22:29:59 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=amarettoslim&quot; class=&quot;user-hover&quot; rel=&quot;amarettoslim&quot;&gt;amarettoslim&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;as you point out, the issue came from one config server having corrupted data. Corruption can happen for various reasons and usually is hard to track down its cause, although the more common causes are network problems or failing hard drives. I would recommend you check the health of the hard drives in the failed config server to be on the safe side.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="614629" author="amarettoslim" created="Mon, 9 Jun 2014 21:56:10 +0000"  >&lt;p&gt;I tracked the issue down to one config server instance out of the 3 and resolved the matter by replacing the bad config server&apos;s data directory with a working copy from one of the other two.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/replace-config-server/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/tutorial/replace-config-server/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I hope this helps someone else. It would still be nice to know what causes this in the first place so if someone from Mongo wants to comment that&apos;d be excellent.&lt;/p&gt;

&lt;p&gt;-Mike&lt;/p&gt;</comment>
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