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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>[CSHARP-1981] GridFSChunkException,Message:GridFS chunk 0 of file id 222448ab20170509181609bd is missing.</title>
                <link>https://jira.mongodb.org/browse/CSHARP-1981</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;We are running load test with MongoDB V3.2.12 and below mentioned error is thrown when reading the binary file from GridFS.&lt;/p&gt;

&lt;p&gt;I had raised a bug. Refer:&lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-1970&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/CSHARP-1970&lt;/a&gt; and it is one of the target for 2.4.4.&lt;br/&gt;
While testing the above mentioned bug fix with the fixed code(created release build by getting code from GitHub) and in the &lt;b&gt;&lt;ins&gt;same environment&lt;/ins&gt;&lt;/b&gt;, I got below error.&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;
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				&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;Type:GridFSChunkException,Message:GridFS chunk &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&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; of file id 222448ab20170509181609bd is missing.&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;   &#22580;&#25152; MongoDB.Driver.GridFS.GridFSForwardOnlyDownloadStream`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.ProcessNextBatch(List`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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; batch)&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;   &#22580;&#25152; MongoDB.Driver.GridFS.GridFSForwardOnlyDownloadStream`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.GetNextBatch(CancellationToken cancellationToken)&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;   &#22580;&#25152; MongoDB.Driver.GridFS.GridFSForwardOnlyDownloadStream`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.GetFirstBatch(CancellationToken cancellationToken)&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;   &#22580;&#25152; MongoDB.Driver.GridFS.GridFSForwardOnlyDownloadStream`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.GetSegment(CancellationToken cancellationToken)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;   &#22580;&#25152; MongoDB.Driver.GridFS.GridFSForwardOnlyDownloadStream`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.Read(Byte[] buffer, Int32 offset, Int32 count)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Please assist.&lt;/p&gt;

&lt;p&gt;Thanks in advance.&lt;br/&gt;
Irshad.&lt;/p&gt;</description>
                <environment>OS:Windows Server 2008 R2&lt;br/&gt;
Sharding Environment</environment>
        <key id="382172">CSHARP-1981</key>
            <summary>GridFSChunkException,Message:GridFS chunk 0 of file id 222448ab20170509181609bd is missing.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="13202">Works as Designed</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="ummerirshadk@gmail.com">Ummer Irshad</reporter>
                        <labels>
                            <label>Bug</label>
                            <label>driver</label>
                    </labels>
                <created>Tue, 9 May 2017 10:55:14 +0000</created>
                <updated>Fri, 27 Oct 2023 13:25:07 +0000</updated>
                            <resolved>Thu, 1 Jun 2017 15:32:28 +0000</resolved>
                                    <version>2.4.3</version>
                                                    <component>Error Handling</component>
                    <component>GridFS</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1924939" author="suras48" created="Tue, 19 Jun 2018 14:51:05 +0000"  >&lt;p&gt;hi Robert,&lt;/p&gt;

&lt;p&gt;We have tried with retry logic as Ummer Irshad is mentioned above , but recently while using MongoDB version 2.6.1 we have got the same issue &quot;Type:GridFSChunkException,Message:GridFS chunk 0 of file id 001f7c182018061320020001 is missing&quot;, but only once.&lt;br/&gt;
So is their any information regarding this in latest driver?&lt;/p&gt;</comment>
                            <comment id="1584942" author="rstam" created="Thu, 1 Jun 2017 15:32:29 +0000"  >&lt;p&gt;Closing this ticket as Works as Designed.&lt;/p&gt;

&lt;p&gt;Please reopen if you need to follow up any further.&lt;/p&gt;</comment>
                            <comment id="1574121" author="JIRAUSER1257092" created="Thu, 18 May 2017 06:22:41 +0000"  >&lt;p&gt;Thank you for providing necessary clarifications.&lt;/p&gt;

&lt;p&gt;Our current plan is to download the GridFS from secondary and go ahead with the retry logic.&lt;br/&gt;
We will let you can the status of this and request you if any additional clarification is required.&lt;/p&gt;

&lt;p&gt;Can we keep this ticket open till we confirm everything is working fine?&lt;/p&gt;

&lt;p&gt;Thank you for your kind support and assistance.&lt;/p&gt;

&lt;p&gt;Irshad.&lt;/p&gt;</comment>
                            <comment id="1573295" author="rstam" created="Wed, 17 May 2017 14:19:57 +0000"  >&lt;p&gt;Not that I know of. Can you download the GridFS files from the primary? That would avoid any replication issues.&lt;/p&gt;</comment>
                            <comment id="1573250" author="JIRAUSER1257092" created="Wed, 17 May 2017 13:51:15 +0000"  >&lt;p&gt;Is there any way to ensure replication has been completed in all secondaries?&lt;/p&gt;</comment>
                            <comment id="1573239" author="rstam" created="Wed, 17 May 2017 13:41:31 +0000"  >&lt;p&gt;Each SecondaryPreferred read operation is a separate read operation and could be routed to different secondaries. So it is possible to read the metadata from one secondary which has replicated the GridFS file, and then get an error when trying to read the actual file from a different secondary which has not yet replicated the GridFS file.&lt;/p&gt;

&lt;p&gt;Any errors while updating the metadata would not be replication related, as all updates are routed to the primary.&lt;/p&gt;

&lt;p&gt;SecondaryPreferred does not take replication lag into account nor does it result in any reads being retried against the primary if there is an error reading from a secondary.&lt;/p&gt;</comment>
                            <comment id="1573234" author="JIRAUSER1257092" created="Wed, 17 May 2017 13:33:59 +0000"  >&lt;p&gt;As you said we are also thinking that this could be a replication issue. &lt;br/&gt;
But, still some questions remains.&lt;/p&gt;

&lt;p&gt;As I said in my previous comment, our application is first showing the list of jobs. For this, we are reading only metadata (not entire binary file). If replication is not completed, will driver returns the metadata?&lt;/p&gt;

&lt;p&gt;As a second step, our application requests the entire binary file. Here, we are getting exception. That too, not in all cases, but in few cases. &lt;br/&gt;
Around 30 out of 1,50,000 cases.&lt;/p&gt;

&lt;p&gt;Sometimes, driver is throwing GridFSFileNotFoundException exception when applications is trying to update the metadata after downloading the binary file. What could be the reason for this? I think this will not be a replication issue.&lt;/p&gt;

&lt;p&gt;Also, application is using &quot;SecondaryPreferred&quot;. By any chance, driver will route to Primary DB, if secondary fails or replication is not happened fully?&lt;/p&gt;</comment>
                            <comment id="1573192" author="rstam" created="Wed, 17 May 2017 13:03:10 +0000"  >&lt;p&gt;1. If we can identify a bug in the driver we will definitely fix it&lt;br/&gt;
2. Retrying the operation is fine as a workaround, but it would be nice to get to the bottom of this because you shouldn&apos;t have to do that (at least not for these particular exceptions)&lt;/p&gt;

&lt;p&gt;The two exceptions you mention are both indicative of the GridFS file data being incomplete. If you try to download a GridFS file from a secondary immediately after it was uploaded it might not yet have replicated to the secondaries, which could be an explanation for the exceptions you are seeing.&lt;/p&gt;

&lt;p&gt;Is that a possible scenario in your case? Or are these files that were uploaded a long time ago and should definitely have had time to replicate to all secondaries?&lt;/p&gt;</comment>
                            <comment id="1572997" author="JIRAUSER1257092" created="Wed, 17 May 2017 05:46:03 +0000"  >&lt;p&gt;Yes, we are using Secondary ReadPreference.&lt;/p&gt;

&lt;p&gt;Our application flow is as below:&lt;br/&gt;
 1. Get all documents based on logged in user.&lt;br/&gt;
 2. If user requests for a particular document, get that document from DB.&lt;/p&gt;

&lt;p&gt;We are getting the problem in the second step mentioned above. That means when the application is requesting for a document(which DB/Driver already informed as available), we are getting either &lt;b&gt;GridFSFileNotFoundException&lt;/b&gt; or &lt;b&gt;GridFSChunkException&lt;/b&gt;. Please refer the comments above for more info about exceptions.&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Additional information:&lt;/ins&gt;&lt;br/&gt;
Our environment is a sharding environment and for each shard, there is a replica set.&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Our fix plan&lt;/ins&gt;&lt;br/&gt;
If we are getting any exception while doing the second operation, the application will do a retry. And, this seems to be working.&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Request&lt;/ins&gt;&lt;br/&gt;
 1. Is there any plan to fix this issue from MongoDB Driver side?&lt;br/&gt;
 2. If no, whether the application level fix suggested above is having any fault?&lt;/p&gt;

&lt;p&gt;Thanks in advance.&lt;br/&gt;
Irshad.&lt;/p&gt;</comment>
                            <comment id="1572598" author="rstam" created="Tue, 16 May 2017 18:48:36 +0000"  >&lt;p&gt;Are you by any chance using ReadPreference Secondary?&lt;/p&gt;

&lt;p&gt;I&apos;m wondering if you are trying to read from secondaries before the data has fully replicated.&lt;/p&gt;</comment>
                            <comment id="1568171" author="JIRAUSER1257092" created="Wed, 10 May 2017 06:18:53 +0000"  >&lt;p&gt;One more information.&lt;/p&gt;

&lt;p&gt;Sometimes we are getting &lt;b&gt;GridFSFileNotFoundException&lt;/b&gt; while getting binary file from DB. Below are the details of the same.&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;
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				&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;Type:GridFSFileNotFoundException,Message:GridFS file not found: file id 7bf9985820170510013521b5.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;   &#229;&#160;&#180;&#230;&#8240;&#8364; MongoDB.Driver.GridFS.GridFSBucket`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.GetFileInfo(IReadBindingHandle binding, TFileId id, CancellationToken cancellationToken)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;   &#229;&#160;&#180;&#230;&#8240;&#8364; MongoDB.Driver.GridFS.GridFSBucket`&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;.OpenDownloadStream(TFileId id, GridFSDownloadOptions options, CancellationToken cancellationToken)&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;Thanks in advance,&lt;br/&gt;
Irshad.&lt;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="561496">CSHARP-2304</issuekey>
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