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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-15377] Mongo.getDatabaseNames() occasionally throws CommandFailureException - &quot;exception: can&apos;t open database in a read lock.&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-15377</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have been having some problems where our mongo connection fails to allow us to get the database names from the DB.&lt;/p&gt;

&lt;p&gt;We call the method:&lt;/p&gt;

&lt;p&gt;com.mongodb.Mongo.getDatabaseNames()&lt;br/&gt;
And 1 out of 100 times, it throws the following exception:&lt;/p&gt;

&lt;p&gt;Caused by: com.mongodb.CommandFailureException: &lt;/p&gt;
{ &quot;serverUsed&quot; : &quot;localhost:27017&quot; , 
        &quot;errmsg&quot; : &quot;exception: can&apos;t open database in a read lock. if db was just closed, consider retrying the query. might otherwise indicate an internal error&quot; , &quot;code&quot; : 15927 , &quot;ok&quot; : 0.0}
&lt;p&gt;    at com.mongodb.CommandResult.getException(CommandResult.java:76)&lt;br/&gt;
    at com.mongodb.CommandResult.throwOnError(CommandResult.java:131)&lt;br/&gt;
    at com.mongodb.Mongo.getDatabaseNames(Mongo.java:397)&lt;br/&gt;
Looking at the mongo code, the database is the internal admin database&lt;/p&gt;

&lt;p&gt;public List&amp;lt;String&amp;gt; getDatabaseNames(){&lt;/p&gt;

&lt;p&gt;  BasicDBObject cmd = new BasicDBObject();&lt;br/&gt;
  cmd.put(&quot;listDatabases&quot;, 1);&lt;/p&gt;

&lt;p&gt;&amp;gt;&amp;gt;CommandResult res = getDB(ADMIN_DATABASE_NAME).command(cmd, getOptions());&lt;br/&gt;
  res.throwOnError();&lt;br/&gt;
This database is not being deleted, but there are several other databases that could be deleted around this time.&lt;/p&gt;

&lt;p&gt;Has anyone else had this problem?&lt;/p&gt;


&lt;p&gt;reposted from StackOverflow:&lt;br/&gt;
&lt;a href=&quot;http://stackoverflow.com/questions/25988180/mongo-getdatabasenames-occasionally-throws-commandfailureexception?noredirect=1#comment40757879_25988180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/25988180/mongo-getdatabasenames-occasionally-throws-commandfailureexception?noredirect=1#comment40757879_25988180&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="160042">SERVER-15377</key>
            <summary>Mongo.getDatabaseNames() occasionally throws CommandFailureException - &quot;exception: can&apos;t open database in a read lock.&quot;</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="greenkiwi">Adam B</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Sep 2014 20:25:07 +0000</created>
                <updated>Wed, 10 Dec 2014 23:05:16 +0000</updated>
                            <resolved>Wed, 24 Sep 2014 20:37:32 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="726499" author="greenkiwi" created="Wed, 24 Sep 2014 21:06:00 +0000"  >&lt;p&gt;Thanks&lt;/p&gt;</comment>
                            <comment id="726457" author="rassi@10gen.com" created="Wed, 24 Sep 2014 20:37:32 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I&apos;m resolving this ticket as a dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14651&quot; title=&quot;listDatabases command errors under high database create/delete load&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14651&quot;&gt;&lt;del&gt;SERVER-14651&lt;/del&gt;&lt;/a&gt;.  Feel free to add yourself as a watcher to that ticket.&lt;/p&gt;

&lt;p&gt;~ Jason Rassi&lt;/p&gt;</comment>
                            <comment id="726443" author="greenkiwi" created="Wed, 24 Sep 2014 20:25:50 +0000"  >&lt;p&gt;The suggestion over there was to file a ticket.  At any rate, filed... and I&apos;ll update over there accordingly.&lt;/p&gt;</comment>
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&lt;p&gt;foreach (String dbName in mongo.getDatabaseNames()){&lt;br/&gt;
   mongo.getDatabase(dbName).drop();&lt;br/&gt;
}&lt;/p&gt;
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