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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-24474] cursor next/hasnext throws MongoException at random</title>
                <link>https://jira.mongodb.org/browse/SERVER-24474</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once we went to using shards, there have been several issues with cursors that occur randomly. One issue we having is a timeout condition where a MongoException is thrown. All of the information that I have found indicates that this is due to the cursor not being used within 10 minutes. However, I know this is not the case because I was able to create a test case that recreated the problem. It doesn&apos;t happen very often but  it does occur.&lt;/p&gt;

&lt;p&gt;Our application is primarily a write oriented  where multiple threads extract data from external source and write the data to one or more collections. There may be 1 or 30 million entries in a collection at the end of the data gathering process. This data is then processed and filter into other collections. While processing and filtering the data, a cursor is usually obtained. Most of the time there isn&apos;t a problem but ever so often the MongoException is throw while processing the cursor. Altering the batch size for the cursor doesn&apos;t seem to change anything.&lt;/p&gt;

&lt;p&gt;We actually have recovery code in place that catches the exception and creates a new cursor and then does a skip() to the current count. This error will occur anywhere from 10 to 40 times a day. I am not sure how many cursors are actually opened but the number of times this occurs is enough to warrant attention.&lt;/p&gt;</description>
                <environment></environment>
        <key id="292527">SERVER-24474</key>
            <summary>cursor next/hasnext throws MongoException at random</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="5">Cannot Reproduce</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="bmwmaestoso">bob whitehurst</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Jun 2016 19:25:16 +0000</created>
                <updated>Wed, 18 Jan 2017 20:07:03 +0000</updated>
                            <resolved>Tue, 4 Oct 2016 01:02:58 +0000</resolved>
                                                                    <component>Admin</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1399414" author="thomas.schubert" created="Tue, 4 Oct 2016 01:02:58 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bmwmaestoso&quot; class=&quot;user-hover&quot; rel=&quot;bmwmaestoso&quot;&gt;bmwmaestoso&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the detailed follow up. Unfortunately, we have not been able to reproduce this issue. My understanding is that the workaround you have in place has minimized the impact of this issue. If you are able to determine situations in which this behavior does not occur, it may help us tailor our reproduction to hit this issue.&lt;/p&gt;

&lt;p&gt;Thanks again,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1289205" author="bmwmaestoso" created="Thu, 9 Jun 2016 13:47:40 +0000"  >&lt;p&gt;I have been able to reproduce this on a number of different configurations.&lt;br/&gt;
3 shards&lt;br/&gt;
3 config servers&lt;br/&gt;
1 mongos&lt;/p&gt;

&lt;p&gt;I have looked in the log files and haven&apos;t found anything that would indicate there is any kind of problem. Our environment is on a secure network and I cannot transfer anything out without it going through a big review process that could take a long time.&lt;/p&gt;

&lt;p&gt;We are using the Java artifact org.mongodb.mongo-java-driver version 3.2.2. This problem also occurred using version 3.0.4.&lt;/p&gt;

&lt;p&gt;It should be very easy to create a test case for this. I basically outlined this in the steps to reproduce. It should only be a few lines of code. All you need to do is populate a collection with anywhere from 60k to 100k of entries. It may take a few iterations before the MongoException is thrown, so you might want to put a while loop around this code. Other aspects that may affect the results from the find:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;we are using a projection to filter out 3 of 7 fields in the documents&lt;/li&gt;
	&lt;li&gt;a sort is used&lt;/li&gt;
	&lt;li&gt;the batch size is set to 150&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;  MongoCursor&amp;lt;Document&amp;gt; cursor = collection.find(...)&lt;br/&gt;
  while (cursor.hasNext()) &lt;/p&gt;
{
    cursor.next();
  }</comment>
                            <comment id="1288395" author="ramon.fernandez" created="Wed, 8 Jun 2016 19:39:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bmwmaestoso&quot; class=&quot;user-hover&quot; rel=&quot;bmwmaestoso&quot;&gt;bmwmaestoso&lt;/a&gt;, we&apos;ll need more information to determine if there&apos;s a bug in MongoDB. Please provide:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Detailed information about your setup (number of servers, &lt;tt&gt;mongos&lt;/tt&gt;, etc.)&lt;/li&gt;
	&lt;li&gt;Any logs from &lt;tt&gt;mongos&lt;/tt&gt; nodes you&apos;re using when you get the exception&lt;/li&gt;
	&lt;li&gt;The language and driver version you&apos;re using&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;You mention you have a reproducer &amp;#8211; can you please share it with us? It would be of great help trying to understand what&apos;s going on.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="295859">SERVER-24723</issuekey>
        </issuelink>
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                            <customfieldvalue>&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;populate a collection with somewhere around 100k entries.&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;do until the exception occurs&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;   get a cursor from a quey on the collection&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;   while hasNext()&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;       next()&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;   close cursor&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
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