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            <title>[SERVER-13678] filemd5 should support an arbitrary range of chunks to hash</title>
                <link>https://jira.mongodb.org/browse/SERVER-13678</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;My specific use case is implementing copy on write in my gridfs driver.&lt;/p&gt;

&lt;p&gt;I would like to update some chunks in a very large file and then use filemd5 to hash just the chunks that I wrote. I could then compare that hash to the hash of the chunks that I have written to in memory to make sure the entire write succeeded. If the hashes match, I would make them permanent. Otherwise, I would roll back the write.&lt;/p&gt;

&lt;p&gt;As you can see, I don&apos;t really have a performant workaround for this particular use case... My only option is to filemd5 the entire file, which is inefficient.&lt;/p&gt;</description>
                <environment></environment>
        <key id="132649">SERVER-13678</key>
            <summary>filemd5 should support an arbitrary range of chunks to hash</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="dditthardt">Robert Ditthardt</reporter>
                        <labels>
                            <label>gridfs</label>
                            <label>query</label>
                    </labels>
                <created>Tue, 22 Apr 2014 19:22:43 +0000</created>
                <updated>Wed, 3 Sep 2014 22:47:27 +0000</updated>
                            <resolved>Wed, 3 Sep 2014 22:47:27 +0000</resolved>
                                    <version>2.6.0</version>
                                                    <component>GridFS</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="711060" author="ramon.fernandez" created="Wed, 3 Sep 2014 22:45:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dditthardt&quot; class=&quot;user-hover&quot; rel=&quot;dditthardt&quot;&gt;dditthardt&lt;/a&gt;, we haven&apos;t heard back from you for a while, so we&apos;re going to mark this issue as resolved. If you want to pursue this improvement feel free to reopen the ticket and provide more details on your use case(s).&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="695772" author="ramon.fernandez" created="Tue, 19 Aug 2014 19:37:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dditthardt&quot; class=&quot;user-hover&quot; rel=&quot;dditthardt&quot;&gt;dditthardt&lt;/a&gt;, we haven&apos;t heard from you for a while. If you are still interested in pursuing this improvement, could you please follow up and provide further details on your use case(s)?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="667963" author="ramon.fernandez" created="Tue, 22 Jul 2014 20:13:42 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dditthardt&quot; class=&quot;user-hover&quot; rel=&quot;dditthardt&quot;&gt;dditthardt&lt;/a&gt;, can you please elaborate further on your use case? The more information you can provide the better we can determine how to best address your needs here.&lt;/p&gt;</comment>
                            <comment id="560647" author="dditthardt" created="Wed, 23 Apr 2014 18:37:04 +0000"  >&lt;p&gt;What would be even better would be to allow specification of a query to match the chunks the user wants to find, and also what field to use. Then, make filemd5 a wrapper around this generic md5 command.&lt;/p&gt;</comment>
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